Explanipedia

Model-independent measurement of the matter-radiation equality scale in DESI 2024 Open

Benedict Bahr-Kalus, David Parkinson, K. Lodha, E. Müeller, E. Chaussidon , et al. · 2025

The peak of the matter power spectrum, known as the turnover (TO) scale, is determined by the horizon size at the time of matter-radiation equality. This scale can serve as a standard ruler, independent of other features in the matter powe…

DESI 2024 V: Full-Shape galaxy clustering from galaxies and quasars Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1 divided into six redshift bins over a ∼ 7,500 square degree f…

The effects of continuum fitting on Lyman-α forest correlations Open

Nicolás G. Busca, J. Rich, Julian Bautista, Andrei Cuceu, Andreu Font-Ribera , et al. · 2025

Correlations of fluctuations of the flux in Lyman-α forests of high-redshift quasars have been observed by the Baryonic Acoustic Oscillation Spectroscopy Survey (BOSS) and the Dark Energy Spectroscopy Instrument (DESI) survey where they ha…

Constraints on neutrino physics from DESI DR2 BAO and DR1 full shape Open

Willem Elbers, Alejandro Avilés, H. E. Noriega, D. Chebat, A. Menegas , et al. · 2025

The Dark Energy Spectroscopic Instrument (DESI) Collaboration has obtained robust measurements of baryon acoustic oscillations in the redshift range 0.1 < z < 4.2 , based on the Lyman- α forest and galaxies from data release 2. We comb…

DESI 2024 VII: cosmological constraints from the full-shape modeling of clustering measurements Open

A. G. Adame, J. Aguilar, S. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

We present cosmological results from the measurement of clustering of galaxy, quasar and Lyman-α forest tracers from the first year of observations with the Dark Energy Spectroscopic Instrument (DESI Data Release 1). We adopt the full-shap…

DESI 2024 II: sample definitions, characteristics, and two-point clustering statistics Open

A. G. Adame, José Aguilar, S. P. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

We present the samples of galaxies and quasars used for DESI 2024 cosmological analyses, drawn from the DESI Data Release 1 (DR1). We describe the construction of large-scale structure (LSS) catalogs from these samples, which include match…

Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data Open

NULL AUTHOR_ID, H. E. Noriega, A. de Mattia, Alejandro Avilés, K. Lodha , et al. · 2025

We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and …

The DESI One-Percent Survey: Modelling the clustering and halo occupation of all four DESI tracers with UCHUU Open

F. Prada, J. Ereza, A. G. Smith, J. Lasker, R. Vaisakh , et al. · 2025

We present results from a set of mock lightcones for the DESI One-Percent Survey, created from the U CHUU simulation. This 8 h −3 Gpc 3 N -body simulation comprises 2.1 trillion particles and provides high-resolution dark matter (sub)haloe…

Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data Open

C. García-Quintero, H. E. Noriega, A. de Mattia, A. Avilés, K. Lodha , et al. · 2025

We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and …

DESI 2024 III: baryon acoustic oscillations from galaxies and quasars Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1. Divided by tracer type, we utilize 300,017 galaxies from the m…

Identifying Missing Quasars from the DESI Bright Galaxy Survey Open

S. Juneau, R. Canning, D. M. Alexander, Ragadeepika Pucha, V. A. Fawcett , et al. · 2025

The Dark Energy Spectroscopic Instrument (DESI) cosmology survey includes a Bright Galaxy Survey (BGS), which will yield spectra for over 10 million bright galaxies ( r < 20.2 AB mag). The resulting sample will be valuable for both cosmolo…

Could sample variance be responsible for the parity-violating signal seen in the Baryon Oscillation Spectroscopic Survey? Open

Oliver H. E. Philcox, J. Ereza · 2025

Recent works have uncovered an excess signal in the parity-odd four-point correlation function measured from the Baryon Oscillation Spectroscopic Survey (BOSS) galaxy catalogue. If physical in origin, this could indicate new parity-breakin…

GD-1 Stellar Stream and Cocoon in the DESI Early Data Release Open

Monica Valluri, Parker Fagrelius, S. E. Koposov, Ting S. Li, Oleg Y. Gnedin , et al. · 2025

We present ∼115 new spectroscopically identified members of the GD-1 tidal stream observed with the 5000-fiber Dark Energy Spectroscopic Instrument (DESI). We confirm the existence of a “cocoon,” which is a broad (FWHM ∼ 2 932 ∼ 460 …

DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations Open

A. G. Adame, José Edgar Madriz Aguilar, S. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman- α forest tracers from the first year of observations from the Dark Energy Spectroscopic Instrument (DESI), to be releas…

Constraining cosmological parameters using void statistics from the SDSS survey Open

Elena Fernández‐García, J. Betancort‐Rijo, F. Prada, Tomoaki Ishiyama, Anatoly Klypin , et al. · 2025

Aims. We aim to constrain the amplitude of the linear spectrum of density fluctuations ( σ 8 ), the matter density parameter (Ω m ), the Hubble constant (H 0 ), Γ = Ω c h , and S 8 from Sloan Digital Sky Survey Data Release 7 (SDSS DR7) by…

Fast Projected Bispectra: the filter-square approach Open

Lea Harscouet, Jessica A. Cowell, J. Ereza, David Alonso, H. Camacho , et al. · 2025

The study of third-order statistics in large-scale structure analyses has been hampered by the increased complexity of bispectrum estimators (compared to power spectra), the large dimensionality of the data vector, and the difficulty in es…

DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2025

We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman- α (Ly α ) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Ly α …

The construction of large-scale structure catalogs for the Dark Energy Spectroscopic Instrument Open

Ashley J. Ross, J. Aguilar, S. P. Ahlen, Shadab Alam, Abhijeet Anand , et al. · 2025

We present the technical details on how large-scale structure (LSS) catalogs are constructed from redshifts measured from spectra observed by the Dark Energy Spectroscopic Instrument (DESI). The LSS catalogs provide the information needed …

DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars Open

A. G. Adame, J. Aguilar, S. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2024

We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range $0.1

Fast Projected Bispectra: the filter-square approach Open

Lea Harscouet, Jessica A. Cowell, J. Ereza, David Alonso, H. Camacho , et al. · 2024

The study of third-order statistics in large-scale structure analyses has been hampered by the increased complexity of bispectrum estimators (compared to power spectra), the large dimensionality of the data vector, and the difficulty in es…

The Early Data Release of the Dark Energy Spectroscopic Instrument Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, G. Aldering , et al. · 2024

The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This pape…

DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, D. M. Alexander , et al. · 2024

We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1

Could Sample Variance be Responsible for the Parity-Violating Signal Seen in the BOSS Galaxy Survey? Open

Oliver H. E. Philcox, J. Ereza · 2024

Recent works have uncovered an excess signal in the parity-odd four-point correlation function measured from the BOSS spectroscopic galaxy survey. If physical in origin, this could indicate evidence for new parity-breaking processes in the…

Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, G. Aldering , et al. · 2024

The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg 2 over 5 yr to constrain the cosmic expansion history through precise measurements of baryon acoustic oscillations (BAO). The scientific p…

The Uchuu–SDSS galaxy light-cones: a clustering, redshift space distortion and baryonic acoustic oscillation study Open

Chi An Dong-Páez, A. G. Smith, Adam O. Szewciw, J. Ereza, Mohamed H. Abdullah , et al. · 2024

We present the data release of the Uchuu–SDSS galaxies: a set of 32 high-fidelity galaxy light-cones constructed from the large Uchuu 2.1 trillion particles N-body simulation using Planck cosmology. We adopt subhalo abundance matching to p…

The correlation function and detection of baryon acoustic oscillation peak from the spectroscopic SDSS-GalWCat galaxy cluster catalogue Open

Mohamed H. Abdullah, Anatoly Klypin, Francisco Prada, Gillian Wilson, Tomoaki Ishiyama , et al. · 2023

We measure the two-point correlation function (CF) of 1357 galaxy clusters with a mass of log10M200 ≥ 13.6 h−1 M⊙ and at a redshift of z ≤ 0.125. This work differs from previous analyses in that it utilizes a spectroscopic cluster catalogu…

Modeling the BAO feature in Bispectrum Open

Jayashree Behera, Mehdi Rezaie, Lado Samushia, J. Ereza · 2023

We investigate how well a simple leading order perturbation theory model of the bispectrum can fit the BAO feature in the measured bispectrum monopole of galaxies. Previous works showed that perturbative models of galaxy bispectrum start f…

The Uchuu-GLAM BOSS and eBOSS LRG lightcones: Exploring clustering and covariance errors Open

J. Ereza, Francisco Prada, Anatoly Klypin, Tomoaki Ishiyama, A. G. Smith , et al. · 2023

This study investigates the clustering and bias of Luminous Red Galaxies (LRG) in the BOSS-LOWZ, -CMASS, -COMB, and eBOSS samples, using two types of simulated lightcones: (i) high-fidelity lightcones from Uchuu $N$-body simulation, employ…

The Early Data Release of the Dark Energy Spectroscopic Instrument Open

DESI Collaboration, A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam , et al. · 2023

The Dark Energy Spectroscopic Instrument (DESI) completed its five-month Survey Validation in May 2021. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This p…

Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument Open

A. G. Adame, J. Aguilar, S. P. Ahlen, Shadab Alam, G Aldering , et al. · 2023

The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg$^2$ over five years to constrain the cosmic expansion history through precise measurements of Baryon Acoustic Oscillations (BAO). The scie…

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