AdS - de Sitter transition in interacting dark energy models
Abstract
Recent cosmological results, including the persistent H0 tension and indications of dynamical dark energy, have raised the possibility that the standard Λ-Cold Dark Matter (ΛCDM) model may be incomplete. At the same time, theoretical developments based on swampland conjectures indicate that the realization of a stable de Sitter vacuum within string theory is challenging. Motivated by these observational and theoretical considerations, we investigate an interacting Λ scenario characterized by a general linear coupling in the dark sector. At the background level, this model naturally allows the dark energy density to evolve from negative to positive values, opening the possibility of a transition from an anti-de Sitter-like phase to the de Sitter-like phase inferred by current observations. We derive the analytic background solutions and perturbation equations, discuss the physically acceptable region of parameter space, and constrain the model with DES-Dovekie type Ia supernovae, DESI BAO and CMB data. Our analysis suggests a parameter space allowing the dark energy density to change sign while maintaining positive dark matter density, motivating further investigation of an interaction-driven anti-de Sitter to de Sitter transition.
Related
- Early Dark Energy Crowds Out Interacting Dark Energy
- Cosmological Constraints on Interacting Scalar-Field Dark Matter and Early Dark Energy mediated by a Kinetic Kernel
- Investigating the coincidence problem with Interacting Dark Energy Models
- Cosmological evolution and late-time attractors in axion-monopole interacting dark energy
- Cosmological constraints on the interacting viscous dark matter and decaying vacuum energy models
BibTeX
@misc{zhao2026sitter,
title = {{AdS - de Sitter transition in interacting dark energy models}},
author = {Yifei Zhao and Jailson Alcaniz and Humberto A. Borges and Saulo Carneiro and Rodrigo von Marttens},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.38422},
eprint = {2609.38422},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.38422},
}
RIS
TY - UNPB
TI - AdS - de Sitter transition in interacting dark energy models
AU - Yifei Zhao
AU - Jailson Alcaniz
AU - Humberto A. Borges
AU - Saulo Carneiro
AU - Rodrigo von Marttens
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.38422
UR - https://arxiv.org/abs/2609.38422
AB - Recent cosmological results, including the persistent H_0 tension and indications of dynamical dark energy, have raised the possibility that the standard Λ-Cold Dark Matter (ΛCDM) model may be incomplete. At the same time, theoretical developments based on swampland conjectures indicate that the realization of a stable de Sitter vacuum within string theory is challenging. Motivated by these observational and theoretical considerations, we investigate an interacting Λ scenario characterized by a general linear coupling in the dark sector. At the background level, this model naturally allows the dark energy density to evolve from negative to positive values, opening the possibility of a transition from an anti-de Sitter-like phase to the de Sitter-like phase inferred by current observations. We derive the analytic background solutions and perturbation equations, discuss the physically acceptable region of parameter space, and constrain the model with DES-Dovekie type Ia supernovae, DESI BAO and CMB data. Our analysis suggests a parameter space allowing the dark energy density to change sign while maintaining positive dark matter density, motivating further investigation of an interaction-driven anti-de Sitter to de Sitter transition.
ER -