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Particle Physics Division

Institute of Research into the Fundamental Laws of the Universe

DESI collaboration publishes observational data on nearly two million astrophysical objects

Jun 12, 2023

DESI collaboration publishes observational data on nearly two million astrophysical objects

To study dark energy, the large Dark Energy Spectroscopic Instrument (DESI) will map over 40 million galaxies. Today, DESI has released its first data and is publishing 15 papers on the scientific study of these data.

The Universe is immensely big, and getting bigger all the time. To study dark energy, the mysterious force behind the accelerating expansion of our Universe, scientists are using the large Dark Energy Spectroscopic Instrument (DESI) survey to map over 40 million galaxies, quasars and stars.

Jan 13, 2021

Building a giant 2D map of the Universe to prepare for DESI's 3D exploration

Nearly 200 researchers were involved in collecting, processing and assembling images of half the sky to prepare for the start of observations by DESI, the Dark Energy Spectroscopic Instrument, which aims to solve the mystery of dark energy.

Building a giant 2D map of the Universe to prepare for DESI's 3D exploration

The dark energy properties revealed over 11 billion years of the Universe expansion

Jul 20, 2020

The dark energy properties revealed over 11 billion years of the Universe expansion

The Sloan Digital Sky Survey (SDSS) published in July a complete analysis of the largest three-dimensional map of the Universe ever created, reconstructing the history of its expansion over a period of 11 billion years.

Jul 08, 2020

First large-scale "3D" mapping of the very distant Universe

Scientists from the large cosmological survey SDSS/eBOSS have constructed the first so-called "tomographic" map of the far Universe on a very large scale, which until now only existed in one dimension, along the line of sight of the ground-based telescope.

First large-scale

The net is tightening on the neutrinos of the cosmos...

Dec 20, 2019

The net is tightening on the neutrinos of the cosmos...

A team from IRFU's Department of Particle Physics (DPhP) has just conducted the most accurate study to date of the mass of cosmic neutrinos, including both standard model neutrinos and sterile neutrinos contributing to dark matter.

Oct 28, 2019

DESI opens its 5,000 eyes to the cosmos in a bid to track dark energy

‘First light’ for the Dark Energy Spectroscopic Instrument (DESI): as the installation phase nears completion, this new instrument is due to undergo final tests before starting to create a giant map of the sky in early 2020, a mission that is scheduled to run for five years.

DESI opens its 5,000 eyes to the cosmos in a bid to track dark energy

DESI gears up!

Jul 12, 2019

The installation of DESI, the Dark Energy Spectroscopic Instrument at the Kitt Peak Observatory in Arizona, has just passed an important milestone: with 6 operational spectrographs on site, the minimum configuration required to meet the scientific objectives of the project has been reached.

Apr 11, 2019

DESI moves to Kitt Peak

The Dark Energy Spectroscopic Instrument (DESI) is intended to make the spectroscopic survey of 35 million galaxies and quasars from 2020 onwards, to study precisely the properties of dark energy.

DESI moves to Kitt Peak

When neutrinos encounter

Feb 25, 2019

When neutrinos encounter "baryonic acoustic oscillations"...

Neutrinos from the Big Bang have been traveling the Universe for more than 13 billion years. They are almost undetectable but their footprint on the formation of large structures in the Universe, such as galaxies, can be detected.

Feb 27, 2018

The brightest objects in the Universe in the onslaught of general relativity

More than twenty years after the discovery of the acceleration of the expansion of the Universe, the nature of the physical phenomenon at the origin of this acceleration, called "dark energy", is still unknown.

The brightest objects in the Universe in the onslaught of general relativity

Probing Dark Matter in the Light of Quasars

Jul 10, 2017

Probing Dark Matter in the Light of Quasars

Several decades after its discovery, dark matter remains enigmatic. Researchers from IRFU have tested three models of dark matter in which the formation of large structures was modeled using supercomputing.

Jun 13, 2017

A New Cosmic Mapping Reinforces Modern Cosmology

An international team from the Sloan Digital Sky Survey (SDSS) has carried out the first large-scale spectroscopic analysis of quasars, and was able to create a full 3D map of the universe and its large structures as it was 6 billion years ago.

A New Cosmic Mapping Reinforces Modern Cosmology

DESI, the kick-off is given!

Jan 30, 2017

DESI, the kick-off is given!

The Dark Energy Spectroscopic Instrument (Desi) will analyze the light emitted by 35 million galaxies and quasars at various times in the past of the Universe and up to 11 billion years to better understand dark energy.

Apr 08, 2014

Astronomers at the Sloan Digital Sky Survey make the most accurate measurement to date of the rate of expansion of the universe

Astronomers at the Sloan Digital Sky Survey (SDSS) used 140,000 distant quasars to measure the rate of expansion of the Universe when it was only a quarter of its present age. This is the best measure of the rate of expansion at any time in the 13 billion years since the Big Bang.

Astronomers at the Sloan Digital Sky Survey make the most accurate measurement to date of the rate of expansion of the universe

Astrophysicists measure the deceleration of the expansion of the early Universe

Nov 27, 2012

Astrophysicists measure the deceleration of the expansion of the early Universe

Astrophysicists from the SDSS-III (Sloan Digital Sky Survey) project, composed largely of French researchers, CEA Irfu, CNRS In2p3 and INSU, have made the first measurement of the rate of expansion of the young Universe, only three billion years old out of the 13.

Jun 23, 2011

To the largest map retracing the history of the Universe!

To retrace the history of the Universe, physicists need to make images of it at its different ages, going back tens of billions of years.

To the largest map retracing the history of the Universe!

The largest image of the sky ever obtained

Jan 12, 2011

The largest image of the sky ever obtained

The Sloan Digital Sky Survey III, a collaboration with contributions from researchers at the CNRS and CEA, has just released the widest sky survey ever carried out to the international scientific community at the annual meeting of the American Astronomy Society held in Seattle between January 10 and 13, 2011.

Oct 10, 2009

Dark energy: the Boss project delivers its first data

The Baryon Oscillation Spectroscopic Survey - known as Boss - delivered its first data during the night of 14-15 September. This experiment, devoted to the search for baryon oscillations, heralds the start of a new era of research into dark energy and the evolution of the Universe.

Dark energy: the Boss project delivers its first data

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