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Hauptverfasser: Wang, Hao, Piao, Yun-Song
Format: Preprint
Veröffentlicht: 2026
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Online-Zugang:https://arxiv.org/abs/2601.06656
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author Wang, Hao
Piao, Yun-Song
author_facet Wang, Hao
Piao, Yun-Song
contents An anti-de Sitter vacuum, corresponding to a negative cosmological constant (NCC), might coexist with one evolving positive dark energy component at low redshift and is hinted by the latest DESI observations. In this paper, we use two methods, \textit{redshift-binned} and \textit{Gaussian Process-based} reconstructions to investigate the effect of a NCC on the equation of state (EOS) $w(z)$ of evolving dark energy (DE) component. We find that a NCC is slightly preferred in both the two reconstructions by up to $\simeq1σ$. Although the degeneracy between the EOS of evolving DE component and NCC weakens the constraint on the reconstructed $w(z)$, this degeneracy leads to the phantom divide $w=-1$ more consistent with the 1$σ$ posterior of $w(z)$.
format Preprint
id arxiv_https___arxiv_org_abs_2601_06656
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Impact of a negative cosmological constant on the reconstruction of dark energy in light of DESI BAO data
Wang, Hao
Piao, Yun-Song
Cosmology and Nongalactic Astrophysics
An anti-de Sitter vacuum, corresponding to a negative cosmological constant (NCC), might coexist with one evolving positive dark energy component at low redshift and is hinted by the latest DESI observations. In this paper, we use two methods, \textit{redshift-binned} and \textit{Gaussian Process-based} reconstructions to investigate the effect of a NCC on the equation of state (EOS) $w(z)$ of evolving dark energy (DE) component. We find that a NCC is slightly preferred in both the two reconstructions by up to $\simeq1σ$. Although the degeneracy between the EOS of evolving DE component and NCC weakens the constraint on the reconstructed $w(z)$, this degeneracy leads to the phantom divide $w=-1$ more consistent with the 1$σ$ posterior of $w(z)$.
title Impact of a negative cosmological constant on the reconstruction of dark energy in light of DESI BAO data
topic Cosmology and Nongalactic Astrophysics
url https://arxiv.org/abs/2601.06656