Probing dark energy evolution post-DESI 2024

Orchard, Lili; Cárdenas, Víctor H.

doi:10.1016/j.dark.2024.101678

Physics of the Dark Universe

2024

DOI: 10.1016/j.dark.2024.101678

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Probing dark energy evolution post-DESI 2024

Lili Orchard,

Víctor H. Cárdenas

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2024

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Cited by 6 publications

References 66 publications

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Robust preference for Dynamical Dark Energy in DESI BAO and SN measurements

Giarè,

Najafi,

Pan

et al. 2024

J. Cosmol. Astropart. Phys.

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Recent Baryon Acoustic Oscillation (BAO) measurements released by DESI, when combined with Cosmic Microwave Background (CMB) data from Planck and two different samples of Type Ia supernovae (Pantheon-Plus and DESY5) reveal a preference for Dynamical Dark Energy (DDE) characterized by a present-day quintessence-like equation of state that crossed into the phantom regime in the past. A core ansatz for this result is assuming a linear Chevallier-Polarski-Linder (CPL) parameterization w(a) = w 0 + wa (1-a) to describe the evolution of the DE equation of state (EoS). In this paper, we test if and to what extent this assumption impacts the results. To prevent broadening uncertainties in cosmological parameter inference and facilitate direct comparison with the baseline CPL case, we focus on 4 alternative well-known models that, just like CPL, consist of only two free parameters: the present-day DE EoS (w0 ) and a parameter quantifying its dynamical evolution (wa ). We demonstrate that the preference for DDE remains robust regardless of the parameterization: w0 consistently remains in the quintessence regime, while wa consistently indicates a preference for a dynamical evolution towards the phantom regime. This tendency is significantly strengthened by DESY5 SN measurements. By comparing the best-fit χ2 obtained within each DDE model, we notice that the linear CPL parameterization is not the best-fitting case. Among the models considered, the EoS proposed by Barboza and Alcaniz consistently leads to the most significant improvement.

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Robust preference for Dynamical Dark Energy in DESI BAO and SN measurements

Giarè,

Najafi,

Pan

et al. 2024

J. Cosmol. Astropart. Phys.

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Scant evidence for thawing quintessence

Wolf,

García-García,

Bartlett

et al. 2024

Phys. Rev. D

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New constraints on the expansion rate of the Universe seem to favor evolving dark energy in the form of thawing quintessence models, i.e., models for which a canonical, minimally coupled scalar field has, at late times, begun to evolve away from potential energy domination. We scrutinize the evidence for thawing quintessence by exploring what it predicts for the equation of state. We show that, in terms of the usual Chevalier-Polarski-Linder parameters, (w0, wa), thawing quintessence is, in fact, only marginally consistent with a compilation of the current data. Despite this, we embrace the possibility that thawing quintessence is dark energy and find constraints on the microphysics of this scenario. We do so in terms of the effective mass m2 and energy scale V0 of the scalar field potential. We are particularly careful to enforce uninformative, flat priors on these parameters so as to minimize their effect on the final posteriors. While the current data favors a large and negative value of m2, when we compare these models to the standard ΛCDM model we find that there is scant evidence for thawing quintessence. Published by the American Physical Society 2024

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Nonparametric late-time expansion history reconstruction and implications for the Hubble tension in light of recent DESI and type Ia supernovae data

Jiang,

Pedrotti,

da Costa

et al. 2024

Phys. Rev. D

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Probing dark energy evolution post-DESI 2024

Cited by 6 publications

References 66 publications

Robust preference for Dynamical Dark Energy in DESI BAO and SN measurements

Robust preference for Dynamical Dark Energy in DESI BAO and SN measurements

Scant evidence for thawing quintessence

Nonparametric late-time expansion history reconstruction and implications for the Hubble tension in light of recent DESI and type Ia supernovae data

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