Strong cosmic censorship in de Sitter spacetimes with dark matter
Year: 2024
Type: article
Abstract: After imposing the weak energy condition on dark matter, we find that even in the absence of charge, a spherically symmetric de Sitter black hole with perfect fluid dark matter may still possess a Cauchy horizon. This paper investigates the stability of the Cauchy horizon in such a black hole under perturbations from a massless scalar field. Through numerical calculations of the massless scalar field's quasinormal modes, we discover that in this spacetime, when the black hole approaches extremality, i.e., when the dark-matter parameter b approaches its maximum value b max , the Strong Cosmic Censorship (SCC) conjecture may be violated. This is the first instance of classical SCC violation observed in a spherically symmetric, uncharged black hole. Additionally, we explore the region of SCC violation within the parameter space Λ M 2 − b / b max . Our findings indicate that as the cosmological constant increases, the violation region initially expands and then contracts.
Source: Physics Letters B
Authors: Shun Jiang, Jie Jiang
Institutions: Beijing Normal University, Beijing Normal University, Zhuhai
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G7951324461, G8943090138
OpenAlex ID: W4402698404