Thawing quintessence and transient cosmic acceleration in light of DESI
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912658598395904 |
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| author | de Souza, Rayff Rodrigues, Gabriel Alcaniz, Jailson |
| author_facet | de Souza, Rayff Rodrigues, Gabriel Alcaniz, Jailson |
| contents | Recent analysis of the DESI Collaboration challenges the $Λ$-Cold Dark Matter ($Λ$CDM) model, suggesting evidence for a dynamic dark energy. These results are obtained in the context of generic parameterizations of the dark energy equation of state (EoS), which better fit the data when they exhibit an unphysical phantom behavior in the past. In this paper, we briefly analyze how ambiguous this latter conclusion can be in light of the background degeneracy between EoS parameterizations and minimally coupled quintessence scenarios. We then investigate whether the current observational data can be accommodated with a non-phantom, thawing dark energy EoS, typical of a broad class of quintessence models. We show that the thawing behavior of this EoS performs comparabily to the Chevallier-Polarski-Linder parameterization and is statistically competitive with $Λ$CDM while predicting cosmic acceleration as a transient phenomenon. Such a dynamic behavior aligns with theoretical arguments from string theory and offers a way out of the trans-Planckian problem that challenges the ever-accelerated $Λ$CDM paradigm. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_16337 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thawing quintessence and transient cosmic acceleration in light of DESI de Souza, Rayff Rodrigues, Gabriel Alcaniz, Jailson Cosmology and Nongalactic Astrophysics High Energy Physics - Theory Recent analysis of the DESI Collaboration challenges the $Λ$-Cold Dark Matter ($Λ$CDM) model, suggesting evidence for a dynamic dark energy. These results are obtained in the context of generic parameterizations of the dark energy equation of state (EoS), which better fit the data when they exhibit an unphysical phantom behavior in the past. In this paper, we briefly analyze how ambiguous this latter conclusion can be in light of the background degeneracy between EoS parameterizations and minimally coupled quintessence scenarios. We then investigate whether the current observational data can be accommodated with a non-phantom, thawing dark energy EoS, typical of a broad class of quintessence models. We show that the thawing behavior of this EoS performs comparabily to the Chevallier-Polarski-Linder parameterization and is statistically competitive with $Λ$CDM while predicting cosmic acceleration as a transient phenomenon. Such a dynamic behavior aligns with theoretical arguments from string theory and offers a way out of the trans-Planckian problem that challenges the ever-accelerated $Λ$CDM paradigm. |
| title | Thawing quintessence and transient cosmic acceleration in light of DESI |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2504.16337 |