18 citations · 72 across the 14 of their papers we have counts for
4 papers · 1 filter
Apparent horizons of the Thakurta spacetime and the description of cosmological black holes
Archil Kobakhidze, Zachary S. C. Picker
We discuss the validity of the Thakurta metric to describe cosmological black holes by analysing the nature of its horizon. By adopting the preferred foliation of the Thakurta spac…
Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes
Zhe Chen, Archil Kobakhidze, Ciaran A. J. O'Hare +2
The companion-axion model introduces a second QCD axion to rescue the Peccei-Quinn solution to the strong-CP problem from the effects of colored gravitational instantons. As in sin…
Phenomenology of the companion-axion model: photon couplings
Zhe Chen, Archil Kobakhidze, Ciaran A. J. O'Hare +2
We study the phenomenology of the 'companion-axion model' consisting of two coupled QCD axions. The second axion is required to rescue the Peccei-Quinn solution to the strong-CP pr…
Comment on: Cosmological black holes are not described by the Thakurta metric
Celine Boehm, Archil Kobakhidze, Ciaran A. J. O'Hare +2
Recently, Hütsi et al.[arXiv:2105.09328] critiqued our work that reconsidered the mathematical description of cosmological black holes. In this short comment, we highlight some of…