Work

A friendly phantom: Late-time AdS-to-dS transition and cosmological tensions

Year: 2026

Type: article

Abstract: We present Ph-[Formula: see text]CDM, a phantom-scalar realization within general relativity of the sign-switching cosmological-constant idea, [Formula: see text]CDM, in which a phantom scalar evolving on a bounded hyperbolic-tangent potential induces a smooth mirror AdS-to-dS transition in the late-time dark-energy density. The wrong-sign kinetic term, usually viewed as pathological, becomes the mechanism lifting the field from a negative- to a positive-energy vacuum-like regime. The construction also shows that the field can become repulsive while its energy density is still negative. The cosmology nevertheless remains controlled: total energy stays positive, the late-time attractor is de Sitter rather than a Big Rip, and the dynamics remain safely infrared. Ph-[Formula: see text]CDM thus offers a concrete late-time mechanism with the potential to address multiple cosmological tensions.

Source: International Journal of Modern Physics D

DOI: 10.1142/s021827182641021x

Authors: Özgür Akarsu, Leandros Perivolaropoulos, A. Emrah Yükselci, Alexander Zhuk

Institutions: Istanbul Technical University, University of Ioannina, Odesa I. I. Mechnikov National University, Deutsches Zentrum für Astrophysik

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7164129124

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