Dynamical dark energy with AdS-dS transitions vs. Baryon Acoustic Oscillations at $z =$ 2.3-2.4
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2025
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| author | Akarsu, Özgür Eingorn, Maxim Perivolaropoulos, Leandros Yükselci, A. Emrah Zhuk, Alexander |
| author_facet | Akarsu, Özgür Eingorn, Maxim Perivolaropoulos, Leandros Yükselci, A. Emrah Zhuk, Alexander |
| contents | In this paper, written in memory of Alexei Starobinsky, we discuss the observational viability of the Ph-$Λ_{\rm s}$CDM model - a dynamical dark energy scenario based on a phantom scalar field undergoing an anti-de Sitter (AdS) to de Sitter (dS) transition - and revisit the Sahni-Shtanov braneworld model in light of updated BAO Ly-$α$ data at $z \sim 2.3$. Both models are able to remain consistent with Planck CMB data while offering potential resolutions to the $H_0$ tension. In both cases, the expansion rate $H(z)$ is suppressed relative to Planck-$Λ$CDM at high redshift and enhanced at low redshift, while remaining consistent with the comoving distance to recombination as estimated by Planck-$Λ$CDM. Comparing model predictions with BAO-inferred values of $H(z)$, we find that SDSS Ly-$α$ data at $z \approx 2.33$ mildly favor such dynamical models, whereas the recent DESI Ly-$α$ measurements agree more closely with $Λ$CDM. Although current high-redshift BAO data do not decisively favor one model over another, our findings illustrate how frameworks originally developed to address earlier anomalies - such as the braneworld scenario - may gain renewed relevance in confronting today's cosmological tensions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_07299 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamical dark energy with AdS-dS transitions vs. Baryon Acoustic Oscillations at $z =$ 2.3-2.4 Akarsu, Özgür Eingorn, Maxim Perivolaropoulos, Leandros Yükselci, A. Emrah Zhuk, Alexander Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory In this paper, written in memory of Alexei Starobinsky, we discuss the observational viability of the Ph-$Λ_{\rm s}$CDM model - a dynamical dark energy scenario based on a phantom scalar field undergoing an anti-de Sitter (AdS) to de Sitter (dS) transition - and revisit the Sahni-Shtanov braneworld model in light of updated BAO Ly-$α$ data at $z \sim 2.3$. Both models are able to remain consistent with Planck CMB data while offering potential resolutions to the $H_0$ tension. In both cases, the expansion rate $H(z)$ is suppressed relative to Planck-$Λ$CDM at high redshift and enhanced at low redshift, while remaining consistent with the comoving distance to recombination as estimated by Planck-$Λ$CDM. Comparing model predictions with BAO-inferred values of $H(z)$, we find that SDSS Ly-$α$ data at $z \approx 2.33$ mildly favor such dynamical models, whereas the recent DESI Ly-$α$ measurements agree more closely with $Λ$CDM. Although current high-redshift BAO data do not decisively favor one model over another, our findings illustrate how frameworks originally developed to address earlier anomalies - such as the braneworld scenario - may gain renewed relevance in confronting today's cosmological tensions. |
| title | Dynamical dark energy with AdS-dS transitions vs. Baryon Acoustic Oscillations at $z =$ 2.3-2.4 |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2504.07299 |