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Cosmological constraints on dark energy parametrizations after DESI 2024: Persistent deviation from standard $\Lambda$CDM cosmology

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arxiv 2407.09767 v2 pith:HFTM5FGF submitted 2024-07-13 astro-ph.CO gr-qc

M. Malekjani , Z. Davari , S. Pourojaghi This is my paper
classification astro-ph.COgr-qc
keywords parametrizationsdesidarkenergylambdaconstraintsstandardbeyond
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abstract

In this work, we present a study on cosmological constraints of dark energy (DE) parametrizations after the observations of Dark Energy Spectroscopic Instruments (DESI) for Baryon Acoustic Oscillations (BAO) in 2024, suggesting potential deviations from the standard flat-$\Lambda$CDM cosmology. This study aims to put observational constraints on equation of state (EoS) parametrizations beyond the standard $\Lambda$CDM model using DESI BAO 2024 data, Cosmic Microwave Background (CMB) anisotropy observations 2018, and various Supernovae type Ia (SNIa) compilations: PantheonPlus, Union3, and Dark Energy Survey 5-year photometrically classified SNIa (DES-SN5YR). Our main goal is to validate the result of DESI collaborations \cite{DESI:2024mwx} in the context of some parametrizations beyond the Chevallier-Polarski-Linder (CPL) approximation known as Barboza-Alcaniz (BA) and Pad\'e parametrizations. These investigations allow us to examine the potential biases in the results presented by DESI collaborations with respect to CPL parametrization. By comparing our findings using BA and Pad\'e parametrizations to the CPL case, we indicate that the deviation from $w_{\Lambda} = -1.0$, observed in the CPL parametrization, is also evident in the BA and Pad\'e parametrizations.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Quantum stress-energy at timelike boundaries: testing a new beyond-$\Lambda$CDM parameter with cosmological data

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    Timelike boundaries sourcing negative, 1/a-scaling vacuum energy fit CMB+BAO data slightly better than LCDM and relax the neutrino-mass constraint, though the preference is only about 2 sigma.

  2. Robust Preference for Dark Sector Interactions

    astro-ph.CO 2026-01 conditional novelty 5.0 of 10

    Interacting dark matter–dark energy models fit DESI BAO and CMB data as well as evolving-dark-energy (CPL) models, with a coupling preference that persists under DES-Dovekie supernova recalibration.

  3. How Holographic is the Dark Energy? A Spline Nodal reconstruction approach

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

    A three-node spline reconstruction of holographic dark energy improves chi-squared over LambdaCDM by about 10 to 12, but Bayesian evidence gives no clear preference.

  4. Observational constraints on early time non-phantom behaviour of dynamical dark energy

    astro-ph.CO 2025-12 conditional novelty 4.0 of 10

    Early scaling dark energy is constrained to be less than about one percent at matter-radiation equality and is disfavored by model selection, while late-time CPL dynamics show only a weak preference away from ΛCDM.

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