PreprintarXiv licencearXiv
Black hole apparent horizons become comoving with the universe
Abstract
It has been shown that static black hole event horizons cannot exist in time-dependent backgrounds without becoming naked singularities. In light of this, we are left with the question ``how does a black hole horizon evolve in an expanding universe?'' Here we offer a solution to this puzzle by showing in full generality that regular black hole apparent horizons tend to become comoving, thus confirming the necessity of a cosmological coupling and raising intriguing possibilities for the early growth of black holes.
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BibTeX
@misc{faraoni2026black,
title = {{Black hole apparent horizons become comoving with the universe}},
author = {Valerio Faraoni and Massimiliano Rinaldi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.21222},
eprint = {2608.21222},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.21222},
}
RIS
TY - UNPB
TI - Black hole apparent horizons become comoving with the universe
AU - Valerio Faraoni
AU - Massimiliano Rinaldi
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2608.21222
UR - https://arxiv.org/abs/2608.21222
AB - It has been shown that static black hole event horizons cannot exist in time-dependent backgrounds without becoming naked singularities. In light of this, we are left with the question ``how does a black hole horizon evolve in an expanding universe?'' Here we offer a solution to this puzzle by showing in full generality that regular black hole apparent horizons tend to become comoving, thus confirming the necessity of a cosmological coupling and raising intriguing possibilities for the early growth of black holes.
ER -