{"id":27205,"date":"2024-04-04T17:06:35","date_gmt":"2024-04-04T15:06:35","guid":{"rendered":"https:\/\/ieec-wp.ixole.es\/?p=27205"},"modified":"2024-04-10T12:13:05","modified_gmt":"2024-04-10T10:13:05","slug":"first-results-from-desi-make-the-most-precise-measurement-of-our-expanding-universe","status":"publish","type":"post","link":"https:\/\/ieec-wp.ixole.es\/en\/first-results-from-desi-make-the-most-precise-measurement-of-our-expanding-universe\/","title":{"rendered":"First results from DESI make the most precise measurement of our expanding Universe"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; background_image=&#8221;https:\/\/www.ieec.cat\/wp-content\/uploads\/2022\/02\/slider-comunicacio.jpg&#8221; max_height=&#8221;130px&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; da_disable_devices=&#8221;off|off|off&#8221; global_colors_info=&#8221;{}&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;24px||11px|||&#8221; da_disable_devices=&#8221;off|off|off&#8221; global_colors_info=&#8221;{}&#8221; da_is_popup=&#8221;off&#8221; da_exit_intent=&#8221;off&#8221; da_has_close=&#8221;on&#8221; da_alt_close=&#8221;off&#8221; da_dark_close=&#8221;off&#8221; da_not_modal=&#8221;on&#8221; da_is_singular=&#8221;off&#8221; da_with_loader=&#8221;off&#8221; da_has_shadow=&#8221;on&#8221;][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;Unitats de recerca&#8221; _builder_version=&#8221;4.14.8&#8243; _dynamic_attributes=&#8221;content&#8221; _module_preset=&#8221;default&#8221; text_font=&#8221;|700||on|||||&#8221; text_font_size=&#8221;16px&#8221; header_font=&#8221;|700|||||||&#8221; custom_margin=&#8221;||10px||false|false&#8221; header_font_size_tablet=&#8221;28px&#8221; header_font_size_phone=&#8221;26px&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoiY3VzdG9tX21ldGFfb3JnYW5pemFjaW9uZXMiLCJzZXR0aW5ncyI6eyJiZWZvcmUiOiIiLCJhZnRlciI6IiIsImVuYWJsZV9odG1sIjoib2ZmIn19@[\/et_pb_text][et_pb_post_title author=&#8221;off&#8221; categories=&#8221;off&#8221; comments=&#8221;off&#8221; featured_image=&#8221;off&#8221; admin_label=&#8221;T\u00edtol i data&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; title_font=&#8221;Cairo|300|||||||&#8221; title_font_size=&#8221;40px&#8221; meta_font=&#8221;||on||||||&#8221; meta_font_size=&#8221;16px&#8221; title_font_size_tablet=&#8221;35px&#8221; title_font_size_phone=&#8221;30px&#8221; title_font_size_last_edited=&#8221;on|desktop&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_post_title][et_pb_text admin_label=&#8221;Subt\u00edtols&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;Source Sans Pro||on||||||&#8221; text_font_size=&#8221;24px&#8221; text_line_height=&#8221;1.1em&#8221; hover_enabled=&#8221;0&#8243; text_font_size_tablet=&#8221;22px&#8221; text_font_size_phone=&#8221;20px&#8221; text_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<ul>\n<li>DESI mapped galaxies and quasars with unprecedented detail, creating the largest 3D map of the universe ever made and measuring how fast the universe expanded over 11 billion years<\/li>\n<li>This is the first time that scientists have measured the expansion history of that distant period (8-11 billion years) with a precision of better than 1%, providing a powerful way to study dark energy<\/li>\n<li>With just its first year of data, DESI has surpassed all previous 3D spectroscopic maps combined and confirmed the basics of our best model of the universe\u2014with some tantalising areas to explore with more data<\/li>\n<li>Researchers from CIEMAT, ICCUB, ICE-CSIC, IFAE and IFT, with IEEC members amongst them, have actively contributed to these important results<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_post_title title=&#8221;off&#8221; meta=&#8221;off&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||0px||false|false&#8221; border_width_top=&#8221;10px&#8221; border_color_top=&#8221;#406fda&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_post_title][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_font_size=&#8221;15px&#8221; text_line_height=&#8221;1.1em&#8221; background_color=&#8221;rgba(64,111,218,0.15)&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;30px|20px|30px|20px|true|true&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><strong>Caption:<\/strong> DESI has made the largest 3D map of our universe to date. Earth is at the centre of this thin slice of the full map. In the magnified section, it is easy to see the underlying structure of matter in our universe.<br \/><span style=\"font-weight: 400;\"><strong>Credits:<\/strong> Claire Lamman\/DESI collaboration; custom colormap package by <a href=\"https:\/\/github.com\/adrn\/cmastro\" target=\"_blank\" rel=\"noopener\">cmastro<\/a><br \/><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">With 5,000 tiny robots in a mountaintop telescope, researchers can look 11 billion years into the past. The light from far-flung objects in space is just now reaching the Dark Energy Spectroscopic Instrument (<\/span><a href=\"https:\/\/www.ieec.cat\/en\/project\/28\/desi\/\"><span style=\"font-weight: 400;\">DESI<\/span><\/a><span style=\"font-weight: 400;\">), a project managed by the <\/span><a href=\"https:\/\/www.lbl.gov\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Lawrence Berkeley National Laboratory<\/span><\/a><span style=\"font-weight: 400;\"> (LBNL), enabling us to map our cosmos as it was in its youth and trace its growth to what we see today. Understanding how our universe has evolved is tied to how it ends, and to one of the biggest mysteries in physics: dark energy, the unknown ingredient causing our universe to expand faster and faster.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To study dark energy\u2019s effects over the past 11 billion years, DESI has created the largest 3D map of our cosmos ever constructed, with the most precise measurements to date. This is the first time scientists have measured the expansion history of the young universe with a precision better than 1%, giving us our best view yet of how the universe evolved. Researchers shared the analysis of their first year of collected data in multiple <\/span><a href=\"https:\/\/data.desi.lbl.gov\/doc\/papers\/\"><span style=\"font-weight: 400;\">papers<\/span><\/a><span style=\"font-weight: 400;\"> that will be posted today on the <\/span><a href=\"https:\/\/arxiv.org\/list\/astro-ph\/new\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">arXiv<\/span><\/a><span style=\"font-weight: 400;\"> and in talks at the <\/span><a href=\"https:\/\/march.aps.org\/about\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">American Physical Society<\/span><\/a><span style=\"font-weight: 400;\"> meeting in the United States and the <\/span><a href=\"https:\/\/moriond.in2p3.fr\/2024\/Cosmology\/cosmology-agenda.html\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Rencontres de Moriond<\/span><\/a><span style=\"font-weight: 400;\"> in Italy. These are the first 4th generation results on dark energy.<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">\u201cAt the moment it looks like the first results from DESI are in agreement with the predictions of the current model\u201d, said <\/span><b>Hui Kong<\/b><span style=\"font-weight: 400;\">, postdoctoral researcher at the <\/span><a href=\"https:\/\/www.ifae.es\/es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Institute for High Energy Physics<\/span><\/a><span style=\"font-weight: 400;\"> (IFAE), Barcelona, and main author of one of the studies made public today. \u201cThere are some hints pointing at small temporal variations in the density of dark energy, but we will need more data to confirm them.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Our leading model of the universe is known as Lambda CDM. It includes both a weakly interacting type of matter (cold dark matter, or CDM) and dark energy (Lambda). Both matter and dark energy shape how the universe expands\u2014but in opposing ways. Matter and dark matter slow the expansion down, while dark energy speeds it up. The amount of each influences how our universe evolves. This model does a good job of describing results from previous experiments and how the universe looks throughout time.<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_divider color=&#8221;#406fda&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;Cairo|700|||||||&#8221; text_text_color=&#8221;#406fda&#8221; text_font_size=&#8221;20px&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>The universe as seen by DESI<\/p>\n<p>[\/et_pb_text][et_pb_video src=&#8221;https:\/\/youtu.be\/jRYUt9nE9b0?feature=shared&#038;t=10&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_video][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_font_size=&#8221;15px&#8221; text_line_height=&#8221;1.1em&#8221; background_color=&#8221;rgba(64,111,218,0.15)&#8221; custom_margin=&#8221;-24px||||false|false&#8221; custom_padding=&#8221;30px|20px|30px|20px|true|true&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><strong>Caption: <\/strong>In this 360-degree video, take an interactive flight through millions of galaxies mapped using coordinate data from DESI.<\/p>\n<p><span style=\"font-weight: 400;\"><strong>Credits:<\/strong> Fiske Planetarium, CU Boulder and DESI collaboration<br \/><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">However, when DESI\u2019s first-year results are combined with data from other studies, there are some subtle differences with what Lambda CDM would predict. As DESI gathers more information during its five-year survey, these early results will become more precise, shedding light on whether the data are pointing to different explanations for the results we observe or the need to update our model. More data will also improve DESI\u2019s other early results, which weigh in on the Hubble constant (a measure of how fast the universe is expanding today) and the mass of particles called neutrinos. <br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cDESI, even with just the data from its first year, is already the spectroscopic survey with most collected data in the history and it goes on increasing this quantity with one million galaxies per month,\u201d said <\/span><b>Eusebio S\u00e1nchez<\/b><span style=\"font-weight: 400;\">, a researcher at <\/span><a href=\"https:\/\/www.ciemat.es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">CIEMAT<\/span><\/a><span style=\"font-weight: 400;\">, Madrid. \u201cThis amazing data sample makes it possible to measure the expansion history of the Universe with an unprecedented precision. We are sure that DESI will increase our knowledge about the Universe and perhaps will allow us to make revolutionary discoveries.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DESI\u2019s overall precision on the expansion history across all 11 billion years is 0.5%, and the most distant epoch, covering 8-11 billion years in the past, has a record-setting precision of 0.82%. That measurement of our young universe is incredibly difficult to make. Yet within one year, DESI has become twice as powerful at measuring the expansion history at these early times as its predecessor (the Sloan Digital Sky Survey\u2019s BOSS\/eBOSS), which took more than a decade.<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|700|||||||&#8221; header_2_font_size=&#8221;25px&#8221; header_2_font_size_tablet=&#8221;23px&#8221; header_2_font_size_phone=&#8221;23px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>Travelling back in time<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">DESI is an international collaboration of more than 900 researchers from over 70 institutions around the world. The instrument was constructed and is operated with funding from the DOE Office of Science, and sits atop the U.S. National Science Foundation\u2019s Nicholas U. Mayall 4-metre Telescope at <\/span><a href=\"https:\/\/noirlab.edu\/public\/programs\/kitt-peak-national-observatory\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Kitt Peak National Observatory<\/span><\/a><span style=\"font-weight: 400;\">, a programme of NSF\u2019s NOIRLab.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Looking at DESI\u2019s map, it\u2019s easy to see the underlying structure of the universe: strands of galaxies clustered together, separated by voids with fewer objects. Our very early universe, well beyond DESI\u2019s view, was quite different: a hot, dense soup of subatomic particles moving too fast to form stable matter like the atoms we know today. Among those particles were hydrogen and helium nuclei, collectively called baryons.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tiny fluctuations in this early ionised plasma caused pressure waves, moving the baryons into a pattern of ripples that is similar to what you\u2019d see if you tossed a handful of gravel into a pond. As the universe expanded and cooled, neutral atoms formed and the pressure waves stopped, freezing the ripples in three dimensions and increasing clustering of future galaxies in the dense areas. Billions of years later, we can still see this faint pattern of 3D ripples, or bubbles, in the characteristic separation of galaxies\u2014a feature called Baryon Acoustic Oscillations (BAOs).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Researchers use the BAO measurements as a cosmic ruler. By measuring the apparent size of these bubbles, they can determine distances to the matter responsible for this extremely faint pattern in the sky. Mapping the BAO bubbles both near and far lets researchers slice the data into chunks, measuring how fast the universe was expanding at each time in its past and modelling how dark energy affects that expansion.<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_divider color=&#8221;#406fda&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;Cairo|700|||||||&#8221; text_text_color=&#8221;#406fda&#8221; text_font_size=&#8221;20px&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>A cosmic ruler<\/p>\n<p>[\/et_pb_text][et_pb_video src=&#8221;https:\/\/www.youtube.com\/watch?v=hoOyOAAj4iY&#038;ab_channel=BerkeleyLab&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_video][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_font_size=&#8221;15px&#8221; text_line_height=&#8221;1.1em&#8221; background_color=&#8221;rgba(64,111,218,0.15)&#8221; custom_margin=&#8221;-24px||||false|false&#8221; custom_padding=&#8221;30px|20px|30px|20px|true|true&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><strong>Caption: <\/strong>This animation shows how baryon acoustic oscillations act as a cosmic ruler for measuring the expansion of the universe.<\/p>\n<p><span style=\"font-weight: 400;\"><strong>Credits:<\/strong> Claire Lamman\/DESI collaboration and Jenny Nuss\/Berkeley Lab<\/p>\n<p><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">\u201cDESI is already more precise than all previous BAO surveys over the whole cosmic history,\u201d said <\/span><b>Violeta Gonz\u00e1lez P\u00e9rez<\/b><span style=\"font-weight: 400;\">, a researcher at the Theoretical Physics Department of the <\/span><a href=\"https:\/\/www.uam.es\/uam\/inicio\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Universidad Aut\u00f3noma from Madrid<\/span><\/a><span style=\"font-weight: 400;\">. \u201cIts data allow us to study cosmic mysteries that lie beyond our current understanding of the Universe.\u201d<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Using galaxies to measure the expansion history and better understand dark energy is one technique, but it can only reach so far. At a certain point, light from typical galaxies is too faint, so researchers turn to quasars, extremely distant, bright galactic cores with black holes at their centres. Light from quasars is absorbed as it passes through intergalactic clouds of gas, enabling researchers to map the pockets of dense matter and use them the same way they use galaxies\u2014a technique known as using the \u201cLyman-alpha forest.\u201d\u00a0<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWe use quasars as a backlight to basically see the shadow of the intervening gas between the quasars and us,\u201d said <\/span><b>Andreu Font-Ribera<\/b><span style=\"font-weight: 400;\">, a scientist at the IFAE in Spain who co-leads DESI\u2019s Lyman-alpha forest analysis. \u201cIt lets us look out further to when the universe was very young. It\u2019s a really hard measurement to do, and very cool to see it succeed.\u201d<\/span><span style=\"font-weight: 400;\"><\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">Researchers used 450,000 quasars, the largest set ever collected for these Lyman-alpha forest measurements, to extend their BAO measurements all the way out to 11 billion years in the past. By the end of the survey, DESI plans to map 3 million quasars and 37 million galaxies.<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|700|||||||&#8221; header_2_font_size=&#8221;25px&#8221; header_2_font_size_tablet=&#8221;23px&#8221; header_2_font_size_phone=&#8221;23px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>State-of-the-art science<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; link_font=&#8221;|700|||on||||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\">DESI is the first spectroscopic experiment to perform a fully \u201cblinded analysis,\u201d which conceals the true result from the scientists to avoid any subconscious confirmation bias. Researchers work in the dark with modified data, writing the code to analyze their findings. Once everything is finalized, they apply their analysis to the original data to reveal the actual answer.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8220;The fact that the analysis was carried out using data-blinding techniques provides us with an extra level of confidence in the results obtained,&#8221; says <\/span><b>H\u00e9ctor Gil Mar\u00edn<\/b><span style=\"font-weight: 400;\">, researcher at the <\/span><a href=\"https:\/\/icc.ub.edu\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Institute of Cosmos Sciences of the University of Barcelona<\/span><\/a><span style=\"font-weight: 400;\"> (ICCUB) and the <\/span><a href=\"https:\/\/www.ieec.cat\/en\/\"><span style=\"font-weight: 400;\">Institute of Space Studies of Catalonia<\/span><\/a><span style=\"font-weight: 400;\"> (IEEC \u2014 Institut d\u2019Estudis Espacials de Catalunya). Blind analyses are already standard practice in fields such as experimental particle physics or clinical studies. Gil-Mar\u00edn and other researchers at ICCUB have developed and implemented what turned out to be a very robust and difficult-to-decipher way to conceal the results of galaxy clustering in DESI until the analysis is completed. &#8220;We are confident that the extra effort involved in this will enhance the confidence and integrity of the DESI results,&#8221; says Gil-Mar\u00edn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DESI\u2019s data will be used to complement future sky surveys such as the Vera C. Rubin Observatory and Nancy Grace Roman Space Telescope, and to prepare for a potential upgrade to DESI (DESI-II) that was recommended in a recent <\/span><a href=\"https:\/\/www.usparticlephysics.org\/2023-p5-report\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">report<\/span><\/a><span style=\"font-weight: 400;\"> by the U.S. Particle Physics Project Prioritization Panel.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cIt is exciting to see how the DESI results provide a precise view of how the Universe is,\u201d mentioned <\/span><b>Francisco Javier Castander<\/b><span style=\"font-weight: 400;\">, a researcher of the <\/span><a href=\"https:\/\/www.ice.csic.es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Instituto de Ciencias del Espacio<\/span><\/a><span style=\"font-weight: 400;\"> (ICE-CSIC) and the IEEC. \u201cMoreover, this is only the beginning, with the new data we are gathering our measurements will be even more precise\u201d.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">Press release prepared in collaboration with the Institute of Cosmos Sciences and the Institute of Space Sciences.<\/span><\/em><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;30px||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_divider color=&#8221;#406fda&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][et_pb_text admin_label=&#8221;M\u00e9s informaci\u00f3&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;Cairo|700|||||||&#8221; text_text_color=&#8221;#406fda&#8221; text_font_size=&#8221;20px&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>More information<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; text_line_height=&#8221;1.1em&#8221; link_font=&#8221;|700|||on||||&#8221; custom_margin=&#8221;20px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"font-weight: 400;\"><\/span><span style=\"font-weight: 400;\">This research is presented in<\/span><span style=\"font-weight: 400;\"> the <\/span><a href=\"https:\/\/arxiv.org\/list\/astro-ph\/new\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">arXiv<\/span><\/a><span style=\"font-weight: 400;\"> and in talks at the <\/span><a href=\"https:\/\/march.aps.org\/about\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">American Physical Society<\/span><\/a><span style=\"font-weight: 400;\"> meeting in the United States and the <\/span><a href=\"https:\/\/moriond.in2p3.fr\/2024\/Cosmology\/cosmology-agenda.html\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Rencontres de Moriond<\/span><\/a><span style=\"font-weight: 400;\"> in Italy.<\/span><br \/><span style=\"font-weight: 400;\"><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_divider color=&#8221;#406fda&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][et_pb_text admin_label=&#8221;Enlla\u00e7os&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;Cairo|700|||||||&#8221; text_text_color=&#8221;#406fda&#8221; text_font_size=&#8221;20px&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Links<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; text_line_height=&#8221;1.1em&#8221; link_font=&#8221;|700|||on|||#1a1140|&#8221; link_text_color=&#8221;#1a1140&#8243; link_line_height=&#8221;1.4em&#8221; custom_margin=&#8221;20px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<ul>\n<li><a href=\"http:\/\/www.ieec.cat\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">IEEC<\/span><\/a><\/li>\n<li><a href=\"https:\/\/icc.ub.edu\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">ICCUB<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.ice.csic.es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">ICE-CSIC<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.ifae.es\/es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">IFAE<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.ciemat.es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">CIEMAT<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.uam.es\/uam\/inicio\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Universidad Aut\u00f3noma de Madrid<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.desi.lbl.gov\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DESI<\/span><\/a><\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_divider color=&#8221;#406fda&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][et_pb_text admin_label=&#8221;Contactes&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;Cairo|700|||||||&#8221; text_text_color=&#8221;#406fda&#8221; text_font_size=&#8221;20px&#8221; custom_margin=&#8221;||10px||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Contacts<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;2_5,3_5&#8243; admin_label=&#8221;Row&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;2_5&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||20px|false|false&#8221; border_width_left=&#8221;1px&#8221; border_color_left=&#8221;#406fda&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; text_line_height=&#8221;1.1em&#8221; link_font=&#8221;|700|||on|||#1a1140|&#8221; link_text_color=&#8221;#1a1140&#8243; link_line_height=&#8221;1.4em&#8221; header_4_font=&#8221;|700|||||||&#8221; header_4_text_color=&#8221;#1a1140&#8243; custom_margin=&#8221;||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h4>IEEC Communication Office<\/h4>\n<p>Barcelona, Spain<br \/>E-mail: <a href=\"mailto:comunicacio@ieec.cat\">comunicacio@ieec.cat<\/a><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;3_5&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||20px|false|false&#8221; border_width_left=&#8221;1px&#8221; border_color_left=&#8221;#406fda&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; text_line_height=&#8221;1em&#8221; link_font=&#8221;|700|||on||||&#8221; link_text_color=&#8221;#1a1140&#8243; header_4_font=&#8221;|700|||||||&#8221; header_4_text_color=&#8221;#1a1140&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h4>Lead Researcher at the IEEC<\/h4>\n<p>Barcelona, Spain<\/p>\n<h4>H\u00e9ctor Gil<\/h4>\n<p>Institute of Space Studies of Catalonia (IEEC)<br \/>Institute of Cosmos Sciences (ICCUB)<br \/>E-mail: <a href=\"mailto:hectorgil@icc.ub.edu\"><span style=\"font-weight: 400;\">hectorgil@icc.ub.edu<\/span><\/a>, <a href=\"mailto:hectorgil@ieec.cat\">hectorgil@ieec.cat<\/a><\/p>\n<h4>Francisco Castander<\/h4>\n<p>Institute of Space Studies of Catalonia (IEEC)<br \/>Institute of Space Sciences (ICE-CSIC)<br \/>E-mail: <a href=\"mailto:fjc@ice.csic.es\"><span style=\"font-weight: 400;\">fjc@ice.csic.es<\/span><\/a>, <a href=\"mailto:fjc@ieec.cat\">fjc@ieec.cat<\/a><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;rgba(64,111,218,0.15)&#8221; global_module=&#8221;17324&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;20px|50px|20px|50px|true|true&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;Sobre l&#8217;IEEC&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;|700|||||||&#8221; header_2_font_size=&#8221;25px&#8221; custom_margin=&#8221;||10px||false|false&#8221; header_2_font_size_tablet=&#8221;23px&#8221; header_2_font_size_phone=&#8221;23px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>About the IEEC<\/h2>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||on||||||&#8221; link_font=&#8221;|700|||on||||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>The Institute of Space Studies of Catalonia (IEEC \u2014 Institut d\u2019Estudis Espacials de Catalunya) promotes and coordinates space research and technology development in Catalonia for the benefit of society. IEEC fosters collaborations both locally and worldwide and is an efficient agent of knowledge, innovation and technology transfer. As a result of more than 25 years of high-quality research, done in collaboration with major international organisations, IEEC ranks among the best international research centres, focusing on areas such as: astrophysics, cosmology, planetary science, and Earth Observation. IEEC\u2019s engineering division develops instrumentation for ground- and space-based projects, and has extensive experience in working with private or public organisations from the aerospace and other innovation sectors.<\/p>\n<p>The IEEC is a non-profit public sector foundation that was established in February 1996. It has a Board of Trustees composed of the Generalitat de Catalunya, Universitat de Barcelona (UB), Universitat Aut\u00f2noma de Barcelona (UAB), Universitat Polit\u00e8cnica de Catalunya \u00b7 BarcelonaTech (UPC), and the Spanish Research Council (CSIC). The IEEC is also a CERCA centre.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Dark Energy Spectroscopic Instrument has mapped galaxies and quasars with unprecedented detail, creating the largest 3D map of the universe ever made and measuring how fast it expanded over 11 billion years.<\/p>\n","protected":false},"author":5,"featured_media":27197,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"2880","footnotes":""},"categories":[111,74,98],"tags":[],"class_list":["post-27205","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-highlighted-news-small","category-news","category-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>First results from DESI make the most precise measurement of our expanding Universe - IEEC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ieec-wp.ixole.es\/en\/first-results-from-desi-make-the-most-precise-measurement-of-our-expanding-universe\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"First results from DESI make the most precise measurement of our expanding Universe - IEEC\" \/>\n<meta property=\"og:description\" content=\"The Dark Energy Spectroscopic Instrument has mapped galaxies and quasars with unprecedented detail, creating the largest 3D map of the universe ever made and measuring how fast it expanded over 11 billion years.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ieec-wp.ixole.es\/en\/first-results-from-desi-make-the-most-precise-measurement-of-our-expanding-universe\/\" \/>\n<meta property=\"og:site_name\" content=\"IEEC\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-04T15:06:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-10T10:13:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ieec-wp.ixole.es\/wp-content\/uploads\/2024\/04\/Newscenter_ALTGrid_890x665px_DESI_slice_zoom.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"890\" \/>\n\t<meta property=\"og:image:height\" content=\"665\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Francisco Panyos\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Francisco Panyos\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/ieec-wp.ixole.es\/en\/first-results-from-desi-make-the-most-precise-measurement-of-our-expanding-universe\/\",\"url\":\"https:\/\/ieec-wp.ixole.es\/en\/first-results-from-desi-make-the-most-precise-measurement-of-our-expanding-universe\/\",\"name\":\"First results from DESI make the most precise measurement of our expanding Universe - 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