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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2404.05722 (astro-ph)
[Submitted on 8 Apr 2024 (v1), last revised 6 Jul 2024 (this version, v4)]

Title:Quintessential interpretation of the evolving dark energy in light of DESI

Authors:Yuichiro Tada, Takahiro Terada
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Abstract:The recent result of Dark Energy Spectroscopic Instrument (DESI) in combination with other cosmological data shows evidence of the evolving dark energy parameterized by $w_0w_a$CDM model. We interpret this result in terms of a quintessential scalar field and demonstrate that it can explain the DESI result even though it becomes eventually phantom in the past. Relaxing the assumption on the functional form of the equation-of-state parameter $w=w(a)$, we also discuss a more realistic quintessential model. The implications of the DESI result for Swampland conjectures, cosmic birefringence, and the fate of the Universe are discussed as well.
Comments: 8 pages, 6 figures; v2: references and discussions added; v3 matches the accepted version in PRD letter; v4: references added
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
Cite as: arXiv:2404.05722 [astro-ph.CO]
  (or arXiv:2404.05722v4 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2404.05722
Journal reference: Phys. Rev. D 109 (2024) no.12, L121305
Related DOI: https://doi.org/10.1103/PhysRevD.109.L121305

Submission history

From: Yuichiro Tada [view email]
[v1] Mon, 8 Apr 2024 17:58:02 UTC (102 KB)
[v2] Fri, 26 Apr 2024 08:43:54 UTC (133 KB)
[v3] Tue, 25 Jun 2024 06:53:19 UTC (136 KB)
[v4] Sat, 6 Jul 2024 15:54:47 UTC (135 KB)
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