Sejong University

Redshift Duality with Pantheon+SH0ES in a Planck-anchored Flat $Λ$ CDM Framework: Implications for Hubble Tension and Observational Inference

Tae-Kyoung Lee

We test an operationally defined redshift duality in which the observed redshift comprises the standard metric-expansion component together with an additional line-of-sight quantum…

DESI DR2 Baryon Acoustic Oscillations from the Lyman Alpha Forest Multipoles

N. G. Karaçaylı, A. Cuceu, J. Aguilar +55

We present an alternative measurement of the Baryon Acoustic Oscillation (BAO) using the Legendre multipole representation of the Ly $α$ forest correlation functions from the second…

Emulating galaxy and peculiar velocity clustering on non-linear scales

T. Dumerchat, J. Bautista, C. Ravoux +37

We explore the potential of cross-correlating galaxies and peculiar velocities on non-linear scales to enhance cosmological constraints. Leveraging the \textsc{AbacusSummit} simula…

Forecast on $f (R)$ Gravity with HI 21cm Intensity Mapping Surveys

Yanling Song, Yu Sang, Linfeng Xiao +1

Modified gravity theories offer a well-motivated extension of General Relativity and provide a possible explanation for the late-time accelerated expansion of the Universe. Among t…

astro-ph.CO2026★ 3 cited

The DESI DR1 Peculiar Velocity Survey: growth rate measurements from the maximum likelihood fields method

Y. Lai, C. Howlett, J. Aguilar +60

We present the constraint on the growth rate of structure from the combination of DESI DR1 BGS sample, Fundamental Plane, and Tully-Fisher peculiar velocity catalogues using the ma…

Parity-odd Four-Point Correlation Function from DESI Data Release 1 Luminous Red Galaxy Sample

J. Hou, R. N. Cahn, J. Aguilar +33

The parity-odd four-point function provides a unique probe of fundamental symmetries and potential new physics in the large-scale structure of the Universe. We present measurements…

Constraining primordial non-Gaussianity from DESI DR1 quasars and Planck PR4 CMB Lensing

Sofia Chiarenza, Alex Krolewski, Marco Bonici +54

We present the first measurement of local-type primordial non-Gaussianity from the cross-correlation between $1.2$ million spectroscopically confirmed quasars from the first data r…

The DESI DR1 Peculiar Velocity Survey: global zero-point and $H_{0}$ constraints

A. Carr, C. Howlett, A. J. Amsellem +55

The Dark Energy Spectroscopic Instrument (DESI) in its first Data Release (DR1) already provides more than 100,000 galaxies with relative distance measurements. The primary purpose…

The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue

C. E. Ross, C. Howlett, J. R. Lucey +58

Measurements of peculiar velocities in the local Universe are a powerful tool to study the nature of dark energy at low ( $z < 0.1$ ) redshifts. Here we present the largest single se…

Galaxy-Multiplet Clustering from DESI DR2

Hanyue Wang, Daniel J. Eisenstein, Jessica Nicole Aguilar +44

We present an efficient estimator for higher-order galaxy clustering using small groups of nearby galaxies, or multiplets. Using the Luminous Red Galaxy (LRG) sample from the Dark…

Full calibration of the tomographic redshift distribution from the HSC PDR3 Shape Catalog with DESI

J. Choppin de Janvry, S. Gontcho A Gontcho, U. Seljak +53

The calibration of tomographic redshift distributions is essential for cosmological analysis of weak lensing data. In this work, we calibrate all four tomographic bins of the Hyper…

astro-ph.CO2025★ 4 cited

$H_{0}$ Without the Sound Horizon (or Supernovae): A 2% Measurement in DESI DR1

E. A. Zaborowski, P. Taylor, K. Honscheid +58

The sound horizon scale $r_{s}$ is a key source of information for early-time $H_{0}$ measurements, and is therefore a common target of new physics proposed to solve the Hubble tension…

Clustering analysis of medium-band selected high-redshift galaxies

H. Ebina, M. White, A. Raichoor +57

Next-generation large-scale structure spectroscopic surveys will probe cosmology at high redshifts $(2.3 < z < 3.5)$ , relying on abundant galaxy tracers such as Ly $α$ emitters (LAE…

Is Dark Energy Increasing or Decreasing in the Late Universe?

Maryam Aghaei Abchouyeh, Maurice H. P. M. van Putten

The concordance cosmological model $Λ$ CDM assumes dark energy to be a constant, consistent with early-time observations, evidenced by Planck- $Λ$ CDM analyses. However, in the face o…

DESI Strong Lens Foundry III: Keck Spectroscopy for Strong Lenses Discovered Using Residual Neural Networks

Shrihan Agarwal, Xiaosheng Huang, William Sheu +49

We present spectroscopic data of strong lenses and their source galaxies using the Keck Near-Infrared Echellette Spectrometer (NIRES) and the Dark Energy Spectroscopic Instrument (…

Fiducial-Cosmology-dependent systematics for the DESI 2024 Full-Shape Analysis

R. Gsponer, S. Ramirez-Solano, F. Rodríguez-Martínez +65

We assess the impact of the fiducial cosmology choice on cosmological inference from full-shape (FS) fits of the galaxy power spectrum in the DESI 2024 Data Release 1 (DR1). Using…

Combined tracer analysis for DESI 2024 BAO

D. Valcin, M. Rashkovetskyi, H. Seo +64

This paper demonstrates how the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) and future baryon acoustic oscillations (BAO) analyses can optimally combine overla…

Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect

M. Rashkovetskyi, D. J. Eisenstein, J. Aguilar +46

The thermal Sunyaev-Zeldovich (tSZ) effect is associated with galaxy clusters - extremely large and dense structures tracing the dark matter with a higher bias than isolated galaxi…

Frequentist Cosmological Constraints from Full-Shape Clustering Measurements in DESI DR1

James Morawetz, Hanyu Zhang, Marco Bonici +53

We present a frequentist analysis of clustering measurements from Data Release 1 of the Dark Energy Spectroscopic Instrument (DESI) using the standard profile likelihood method. Wh…

astro-ph.CO2025★ 16 cited

Spectroscopic Characterization of redMaPPer Galaxy Clusters with DESI

J. Myles, D. Gruen, T. Jeltema +44

Optical galaxy cluster identification algorithms such as redMaPPer promise to enable an array of astrophysical and cosmological studies, but suffer from biases whereby galaxies in…

astro-ph.CO2025★ 9 cited

Model-Independent Measurement of the Matter-Radiation Equality Scale in DESI 2024

B. Bahr-Kalus, D. Parkinson, K. Lodha +52

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 stand…

Positive neutrino masses with DESI DR2 via matter conversion to dark energy

S. Ahlen, A. Aviles, B. Cartwright +46

The Dark Energy Spectroscopic Instrument (DESI) is a massively parallel spectroscopic survey on the Mayall telescope at Kitt Peak, which has released measurements of baryon acousti…

astro-ph.CO2025★ 62 cited

Dynamical Dark Energy in light of the DESI DR2 Baryonic Acoustic Oscillations Measurements

Gan Gu, Xiaoma Wang, Yuting Wang +57

Understanding whether cosmic acceleration arises from a cosmological constant or a dynamical component is a central goal of cosmology, and the Dark Energy Spectroscopic Instrument…