The Universe according to DESI results

Abstract

The recent fit of cosmological parameters by the Dark Energy Spectroscopic Instrument (DESI) collaboration will have a significant impact on our understanding of the universe. Given its importance, we conduct several consistency checks and draw conclusions from the fit. Specifically, we focus on the following key issues relevant to cosmology: (i) the acceleration of the universe's expansion, which, according to the fit, differs over cosmological time compared to the standard cosmological model; (ii) the age of the universe, which appears slightly shorter than the age of the oldest stars; and (iii) the solution of the scale factor, both numerically and in an approximate analytical form.

32 pages, 9 Figures, 10 Tables

References in corpus (49)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• f(R) Theories Of Gravity
• f(R) theories
• f(R,T) gravity
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Dark Energy and the Accelerating Universe
• f(T) teleparallel gravity and cosmology
• Tensions between the Early and the Late Universe
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• Jerk, snap, and the cosmological equation of state
• f(R,L_m) gravity
• Cosmology in $f(Q)$ geometry
• Teleparallel Gravity: From Theory to Cosmology
• $f(Q,T)$ gravity
• Timescale Stretch Parameterization of Type Ia Supernova B-band Light Curves
• Cosmography in f(T)-gravity
• Metric-affine approach to teleparallel gravity
• FRW Cosmology in F(R,T) gravity
• Chemical Evolution in Hierarchical Models of Cosmic Structure II: The Formation of the Milky Way Stellar Halo and the Distribution of the Oldest Stars
• Energy-Momentum Squared Gravity
• $f(R,T_{\mu \nu }{T}^{\mu \nu })$ gravity and Cardassian-like expansion as one of its consequences
• Weyl type $f(Q,T)$ gravity, and its cosmological implications
• New types of $f(T)$ gravity
• Cosmological Models in Energy-Momentum-Squared Gravity
• Cosmology in $f(Q)$ gravity: A unified dynamical system analysis at background and perturbation levels
• First Batch of Candidate Galaxies at Redshifts 11 to 20 Revealed by the James Webb Space Telescope Early Release Observations
• Quintessential interpretation of the evolving dark energy in light of DESI
• Palatini formulation of $f(R,T)$ gravity theory, and its cosmological implications
• Cosmological evolution in R^2 gravity
• Cosmological Inflation in f(Q, T) Gravity
• Faint Population III supernovae as the origin of the most iron-poor stars
• Late-time acceleration in $f\left(Q\right)$ gravity: Analysis and constraints in an anisotropic background
• Homogeneous and isotropic cosmology in general teleparallel gravity
• An Ultra Metal-poor Star Near the Hydrogen-burning Limit
• Leptonic CP Violation in Supersymmetric Standard Model
• Testing CCC+TL Cosmology with Observed BAO Features
• Analytic solutions for the $\Lambda$-FRW Model
• PANORAMIC: Discovery of an Ultra-Massive Grand-Design Spiral Galaxy at $z\sim 5.2$
• A constant equation of state for quintessence ?
• On the Conformal Frames in $f(R)$ Gravity
• An empirical consistent redshift bias: A possible direct reproducible observation of Zwicky's TL theory
• $f(R)$ Dual Theories of Quintessence : Expansion-Collapse Duality
• Galaxy formation from a timescale perspective
• The Earliest Stage of Galactic Star Formation
• Cosmologies in $f(R,{\mathcal{L}}_m)$ theory with non-minimal coupling between geometry and matter

Cited by in corpus (1)

• Off-diagonal solutions in Einsteingravity modeling f(R) gravity and dynamical darkenergy vs Lambda CDM cosmology