[et_pb_section fb_built=”1″ _builder_version=”4.16″ _module_preset=”default” background_image=”https:\/\/ieec-wp.ixole.es\/wp-content\/uploads\/2022\/02\/slider-comunicacio.jpg” max_height=”130px” custom_padding=”0px||0px||false|false” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”24px||11px|||” da_disable_devices=”off|off|off” global_colors_info=”{}” da_is_popup=”off” da_exit_intent=”off” da_has_close=”on” da_alt_close=”off” da_dark_close=”off” da_not_modal=”on” da_is_singular=”off” da_with_loader=”off” da_has_shadow=”on”][et_pb_row _builder_version=”4.16″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”Unitats de recerca” _builder_version=”4.16″ _dynamic_attributes=”content” _module_preset=”default” text_font=”|700||on|||||” text_font_size=”16px” header_font=”|700|||||||” custom_margin=”||10px||false|false” header_font_size_tablet=”28px” header_font_size_phone=”26px” header_font_size_last_edited=”on|phone” global_colors_info=”{}”]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoiY3VzdG9tX21ldGFfb3JnYW5pemFjaW9uZXMiLCJzZXR0aW5ncyI6eyJiZWZvcmUiOiIiLCJhZnRlciI6IiIsImVuYWJsZV9odG1sIjoib2ZmIn19@[\/et_pb_text][et_pb_post_title author=”off” categories=”off” comments=”off” featured_image=”off” admin_label=”T\u00edtol i data” _builder_version=”4.27.2″ _module_preset=”default” title_font=”Cairo|300|||||||” title_font_size=”40px” meta_font=”||on||||||” meta_font_size=”16px” title_font_size_tablet=”35px” title_font_size_phone=”30px” title_font_size_last_edited=”on|desktop” global_colors_info=”{}”][\/et_pb_post_title][et_pb_text admin_label=”Subt\u00edtols” _builder_version=”4.27.2″ _module_preset=”default” text_font=”Source Sans Pro||on||||||” text_font_size=”24px” text_line_height=”1.1em” text_font_size_tablet=”22px” text_font_size_phone=”20px” text_font_size_last_edited=”on|phone” global_colors_info=”{}”]<\/p>\n
A complex analysis of DESI\u2019s first year of data provides one of the most stringent tests yet of general relativity and how gravity behaves at cosmic scales<\/p>\n<\/li>\n
Looking at galaxies and how they cluster across time reveals the growth of cosmic structure, which lets DESI test theories of modified gravity\u2013an alternative explanation for our universe\u2019s accelerating expansion<\/p>\n<\/li>\n
DESI researchers found that the way galaxies cluster is consistent with our standard model of gravity and the predictions from Einstein’s theory of general relativity<\/p>\n<\/li>\n
CIEMAT, ICCUB, ICE-CSIC, IFAE, and IFT, including IEEC members among them, have played a significant role in achieving these important results<\/p>\n<\/li>\n<\/ul>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_post_title title=”off” meta=”off” _builder_version=”4.16″ _module_preset=”default” custom_margin=”||0px||false|false” border_width_top=”10px” border_color_top=”#406fda” global_colors_info=”{}”][\/et_pb_post_title][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font=”||||||||” text_font_size=”15px” text_line_height=”1.1em” background_color=”rgba(64,111,218,0.15)” custom_margin=”0px||||false|false” custom_padding=”30px|20px|30px|20px|true|true” global_colors_info=”{}”]<\/p>\n
Caption:<\/strong> DESI observes the sky from the Mayall Telescope, shown here during the 2023 Geminid meteor shower. [\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” link_font=”|700|||on||||” global_colors_info=”{}”]<\/p>\n Gravity has shaped our cosmos. Its attractive influence turned tiny differences in the amount of matter present in the early universe into the sprawling strands of galaxies we see today. A new study using data from the <\/span>Dark Energy Spectroscopic Instrument<\/span><\/a> (DESI) has traced how this cosmic structure grew over the past 11 billion years, <\/span>providing the most precise test to date of gravity at very large scales<\/b>.<\/span><\/p>\n DESI is an international collaboration of more than 900 researchers from over 70 institutions around the world and is managed by the Department of Energy\u2019s <\/span>Lawrence Berkeley National Laboratory<\/span><\/a> (Berkeley Lab). In their new study, DESI researchers found that <\/span>gravity behaves as predicted by Einstein\u2019s theory of general relativity<\/b>. The result validates our leading model of the universe and limits possible theories of modified gravity, which have been proposed as alternative ways to explain unexpected observations\u2013including the accelerating expansion of our universe that is typically attributed to dark energy.<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” header_2_font=”|700|||||||” header_2_font_size=”25px” header_2_font_size_tablet=”23px” header_2_font_size_phone=”23px” header_2_font_size_last_edited=”on|phone” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” link_font=”|700|||on||||” hover_enabled=”0″ locked=”off” global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n “These data allow us to study how fast the largest structures of the universe have formed, and thus set limits in the Einstein General Relativity theory at cosmological scales, much larger than the solar system scales” explains H\u00e9ctor Gil Mar\u00edn from the <\/span>Institute of Cosmos Sciences of the University of Barcelona<\/span><\/a> (ICCUB) and member of the <\/span>Institute of Space Studies of Catalonia<\/span><\/a> (IEEC \u2014 Institut d\u2019Estudis Espacials de Catalunya) who has co-lead this new analysis. “So far the results perfectly fit the predictions by the Einstein General Relativity Theory”.<\/span><\/p>\n The study also provided new upper limits on the mass of neutrinos<\/b>, the only fundamental particles whose masses have not yet been precisely measured. Previous neutrino experiments found that the sum of the masses of the three types of neutrinos should be at least 0.059 eV\/c<\/span>2<\/span>. (For comparison, an electron has a mass of about 511,000 eV\/c<\/span>2<\/span>.) DESI\u2019s results indicate that the sum should be less than 0.071 eV\/c<\/span>2<\/span>, leaving a narrow window for neutrino masses.<\/span><\/p>\n The DESI collaboration shared their results in several papers posted to the online <\/span>repository arXiv<\/span><\/a> today and will soon be published in the Journal of Cosmology and Astroparticle Physics. The complex analysis used nearly 6 million galaxies and quasars and lets researchers see up to 11 billion years into the past. <\/span>With just one year of data, DESI has made the most precise overall measurement of the growth of structure<\/b>, surpassing previous efforts that took decades to make. <\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” header_2_font=”|700|||||||” header_2_font_size=”25px” header_2_font_size_tablet=”23px” header_2_font_size_phone=”23px” header_2_font_size_last_edited=”on|phone” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” link_font=”|700|||on||||” locked=”off” global_colors_info=”{}”]<\/p>\n Today\u2019s results provide an extended analysis of <\/span>DESI\u2019s first year of data<\/span><\/a>, which in April made the largest 3D map of our universe to date and revealed <\/span>hints that dark energy might be evolving over time<\/b>. The April results looked at a particular feature of how galaxies cluster known as baryon acoustic oscillations (BAO). The new analysis, called a \u201cfull-shape analysis,\u201d broadens the scope to extract more information from the data, measuring how galaxies and matter are distributed on different scales throughout space. The study required months of additional work and cross-checks. Like the previous study, it used a technique to hide the result from the scientists until the end, mitigating any unconscious bias.<\/span><\/p>\n \u201cThe results of the first year of DESI data are stunning,\u201d says Eusebio S\u00e1nchez, a researcher at CIEMAT who has contributed to the data analysis. \u201cAnd this is only the beginning, the project is taking more data that will allow us to improve a lot the current understanding of gravity and dark energy.\u201d<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.16″ _module_preset=”default” locked=”off” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#406fda” _builder_version=”4.16″ _module_preset=”default” custom_margin=”||10px||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font=”Cairo|700|||||||” text_text_color=”#406fda” text_font_size=”20px” custom_margin=”||10px||false|false” global_colors_info=”{}”]<\/p>\n Gravity at cosmic scales<\/p>\n [\/et_pb_text][et_pb_video src=”https:\/\/youtu.be\/AgX3lZEr240″ _builder_version=”4.27.2″ _module_preset=”default” custom_margin=”||2px|||” global_colors_info=”{}”][\/et_pb_video][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font=”||||||||” text_font_size=”15px” text_line_height=”1.1em” background_color=”rgba(64,111,218,0.15)” custom_margin=”0px||||false|false” custom_padding=”30px|20px|30px|20px|true|true” global_colors_info=”{}”]<\/p>\n Caption:<\/strong> This simulation shows how more or less gravity affects the positions of galaxies that we observe, changing how they are clustered in a galaxy map. Because different models of gravity predict different clustering of galaxies, DESI researchers can compare observations with simulations to test gravity at cosmic scales. [\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” link_font=”|700|||on||||” global_colors_info=”{}”]<\/p>\n DESI is a state-of-the-art instrument that can capture light from 5,000 galaxies simultaneously. It was constructed and is operated with funding from the DOE Office of Science. DESI is mounted on the U.S. National Science Foundation\u2019s Nicholas U. Mayall 4-metre Telescope at <\/span>Kitt Peak National Observatory<\/span><\/a> (a programme of NSF NOIRLab). The experiment is now in its fourth of five years surveying the sky and plans to collect roughly 40 million galaxies and quasars by the time the project ends.<\/span><\/p>\n The collaboration is currently analysing the first three years of collected data and expects to present updated measurements of dark energy and the expansion history of our universe in spring 2025. DESI\u2019s expanded results released today are consistent with the experiment\u2019s earlier <\/span>preference for an evolving dark energy<\/b>, adding to the anticipation of the upcoming analysis.\u00a0<\/span><\/p>\n \u201cThe distribution of galaxies suggests the presence of dark matter and dark energy, both of which remain largely mysterious to us,\u201d says Hui Kong, a postdoctoral researcher at IFAE who worked on the curation of the galaxy catalogues. \u201cHowever, the precise measurements provided by DESI offer promising insights into these fundamental questions about the universe.\u201d<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” header_2_font=”|700|||||||” header_2_font_size=”25px” header_2_font_size_tablet=”23px” header_2_font_size_phone=”23px” header_2_font_size_last_edited=”on|phone” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” link_font=”|700|||on||||” locked=”off” global_colors_info=”{}”]<\/p>\n DESI is supported by the DOE Office of Science and by the National Energy Research Scientific Computing Center, a DOE Office of Science user facility. Additional support for DESI is provided by the U.S. National Science Foundation; the Science and Technology Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Humanities, Sciences, and Technologies of Mexico; the Ministry of Science and Innovation of Spain; and by the DESI member institutions.<\/span><\/span><\/p>\n The DESI collaboration is honoured to be permitted to conduct scientific research on I\u2019oligam Du\u2019ag (Kitt Peak), a mountain with particular significance to the Tohono O\u2019odham Nation.<\/span><\/span><\/p>\n The institutions participating in DESI include the Centro de Investigaciones Energ\u00e9ticas, Medioambientales y Tecnol\u00f3gicas (CIEMAT), the Instituto de Ciencias del Espacio (ICE-CSIC\/IEEC), the Institut de Ci\u00e8ncies del Cosmos at the Universitat de Barcelona (ICCUB), the Institut de F\u00edsica d’Altes Energies (IFAE), the Instituto de F\u00edsica Te\u00f3rica (IFT-UAM\/CSIC), the Instituto de Astrof\u00edsica de Andaluc\u00eda (IAA) and the Instituto de Astrof\u00edsica de Canarias (IAC).<\/span><\/span><\/p>\n The full list of participating institutions and more information about DESI is available at: <\/span>https:\/\/www.desi.lbl.gov<\/span><\/a>.<\/span><\/p>\n \u00a0<\/span><\/p>\n Distributed by the Centro de Investigaciones Energ\u00e9ticas, Medioambientales y Tecnol\u00f3gicas (CIEMAT), the Institut de Ci\u00e8ncies del Cosmos de la Universitat de Barcelona (ICCUB), the Instituto de Ciencias del Espacio (ICE-CSIC), the Institut d\u2019Estudis Espacials de Catalunya (IEEC), the Institut de F\u00edsica d\u2019Altes Energies (IFAE), and the Instituto de F\u00edsica Te\u00f3rica\u00a0 (UAM-CSIC) on behalf of the DESI collaboration.<\/span><\/i><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ _module_preset=”default” custom_margin=”30px||||false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#406fda” _builder_version=”4.16″ _module_preset=”default” custom_margin=”||10px||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”M\u00e9s informaci\u00f3” _builder_version=”4.27.2″ _module_preset=”default” text_font=”Cairo|700|||||||” text_text_color=”#406fda” text_font_size=”20px” custom_margin=”||10px||false|false” global_colors_info=”{}”]<\/p>\n More information<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font_size=”16px” text_line_height=”1.1em” link_font=”|700|||on||||” custom_margin=”20px||||false|false” global_colors_info=”{}”]<\/p>\n This research is presented <\/span>in several papers posted to the online <\/span>repository arXiv<\/span><\/a>.<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ _module_preset=”default” custom_margin=”||||false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#406fda” _builder_version=”4.16″ _module_preset=”default” custom_margin=”||10px||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Enlla\u00e7os” _builder_version=”4.27.2″ _module_preset=”default” text_font=”Cairo|700|||||||” text_text_color=”#406fda” text_font_size=”20px” custom_margin=”||10px||false|false” global_colors_info=”{}”]<\/p>\n Links<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font_size=”16px” text_line_height=”1.1em” link_font=”|700|||on|||#1a1140|” link_text_color=”#1a1140″ link_line_height=”1.4em” custom_margin=”20px||||false|false” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ _module_preset=”default” custom_margin=”||||false|false” locked=”off” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#406fda” _builder_version=”4.16″ _module_preset=”default” custom_margin=”||10px||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Contactes” _builder_version=”4.27.2″ _module_preset=”default” text_font=”Cairo|700|||||||” text_text_color=”#406fda” text_font_size=”20px” custom_margin=”||10px||false|false” global_colors_info=”{}”]<\/p>\n Contacts<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”2_5,3_5″ admin_label=”Row” _builder_version=”4.16″ _module_preset=”default” custom_margin=”0px||||false|false” custom_padding=”0px||||false|false” global_colors_info=”{}”][et_pb_column type=”2_5″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”|||20px|false|false” border_width_left=”1px” border_color_left=”#406fda” global_colors_info=”{}”][et_pb_text _builder_version=”4.16″ _module_preset=”default” text_font_size=”16px” text_line_height=”1.1em” link_font=”|700|||on|||#1a1140|” link_text_color=”#1a1140″ link_line_height=”1.4em” header_4_font=”|700|||||||” header_4_text_color=”#1a1140″ custom_margin=”||||false|false” locked=”off” global_colors_info=”{}”]<\/p>\n Castelldefels, Barcelona [\/et_pb_text][\/et_pb_column][et_pb_column type=”3_5″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”|||20px|false|false” border_width_left=”1px” border_color_left=”#406fda” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” text_font_size=”16px” text_line_height=”1em” link_font=”|700|||on||||” link_text_color=”#1a1140″ header_4_font=”|700|||||||” header_4_text_color=”#1a1140″ global_colors_info=”{}”]<\/p>\n Institute of Space Studies of Catalonia (IEEC) Institute of Space Studies of Catalonia (IEEC) [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row module_class=”ieec-about” _builder_version=”4.14.8″ _module_preset=”default” background_color=”rgba(64,111,218,0.15)” global_module=”17324″ global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”20px|50px|20px|50px|true|true” global_colors_info=”{}”][et_pb_text admin_label=”Sobre l’IEEC” _builder_version=”4.16″ _module_preset=”default” header_2_font=”|700|||||||” header_2_font_size=”25px” custom_margin=”||10px||false|false” header_2_font_size_tablet=”23px” header_2_font_size_phone=”23px” header_2_font_size_last_edited=”on|phone” locked=”off” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Text” _builder_version=”4.16″ _module_preset=”default” text_font=”||on||||||” link_font=”|700|||on||||” locked=”off” global_colors_info=”{}”]<\/p>\n 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 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 [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" The Instrument, which has the participation of IEEC researchers, provides one of the most stringent tests yet of general relativity and how gravity behaves at cosmic scales.<\/p>\n","protected":false},"author":5,"featured_media":32070,"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-32080","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-highlighted-news-small","category-news","category-science"],"yoast_head":"\n
Credits:<\/strong> KPNO\/NOIRLab\/NSF\/AURA\/R. Sparks
<\/span><\/p>\nLimits to Einstein’s theory of gravitation<\/h2>\n
Better understanding of gravity and dark energy in the cosmos<\/h2>\n
Credits:<\/strong> Claire Lamman and Michael Rashkovetskyi \/ DESI collaboration.
<\/span><\/p>\nThe Dark Energy Spectroscopic Instrument collaboration<\/h2>\n
\n
IEEC Communication Office<\/h4>\n
E-mail: comunicacio@ieec.cat<\/a><\/p>\nLead Researcher at the IEEC<\/h4>\n
H\u00e9ctor Gil<\/h4>\n
Institute of Cosmos Sciences (ICCUB)
E-mail: hectorgil@ieec.cat,<\/a> hectorgil@icc.ub.edu<\/a><\/p>\nFrancisco Castander<\/h4>\n
Institute of Space Sciences (ICE-CSIC)
E-mail: fjc@ieec.cat,<\/a> fjc@ice.csic.es<\/a><\/p>\nAbout the IEEC<\/h2>\n