Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Boyanov, Valentin"'
Autor:
Boyanov, Valentin, Cardoso, Vitor, Destounis, Kyriakos, Jaramillo, José Luis, Macedo, Rodrigo Panosso
Black holes in anti-de Sitter spacetime provide an important testing ground for both gravitational and field-theoretic phenomena. In particular, the study of perturbations can be useful to further our understanding regarding certain physical processe
Externí odkaz:
http://arxiv.org/abs/2312.11998
Publikováno v:
Phys. Rev. D 109, 044023 (2024)
Pseudospectral analyses have broadened our understanding of ringdown waveforms from binary remnants, by providing insight into both the stability of their characteristic frequencies under environmental perturbations, as well as the underlying transie
Externí odkaz:
http://arxiv.org/abs/2312.11630
Standard General Relativity assumes that, in the absence of classical matter sources, spacetime is empty. This chapter considers and analyses the new behaviours of the gravitational field that appear when one substitutes this emptiness by a reactive
Externí odkaz:
http://arxiv.org/abs/2307.13416
Autor:
Boyanov, Valentin
It is the goal of this thesis to revisit and revise the problem of black hole formation and evolution in semiclassical gravity -- a theory in which spacetime is treated classically, while matter admits a quantum description, coupling to gravity throu
Externí odkaz:
http://arxiv.org/abs/2306.07169
Autor:
Boyanov, Valentin, Destounis, Kyriakos, Macedo, Rodrigo Panosso, Cardoso, Vitor, Jaramillo, José Luis
Publikováno v:
Phys. Rev. D 107, 064012 (2023)
Recent investigations of the pseudospectrum in black hole spacetimes have shown that quasinormal mode frequencies suffer from spectral instabilities. This phenomenon may severely affect gravitational-wave spectroscopy and limit precision tests of gen
Externí odkaz:
http://arxiv.org/abs/2209.12950
Autor:
Barceló, Carlos, Boyanov, Valentin, Garay, Luis J., Martín-Martínez, Eduardo, Velázquez, Jose M. Sánchez
In this work we analyse the potential for a warp drive spacetime to develop instabilities due to the presence of quantum matter. Particularly, we look for points of infinite blueshift (which are analogous to points of a black hole inner horizon, know
Externí odkaz:
http://arxiv.org/abs/2207.06458
Autor:
Boyanov, Valentin
I argue that an approach which uses an appropriate admixture of both classical and semiclassical effects is essential for understanding the ultimate fate of gravitational collapse and the nature of black holes. I provide an example of a problem which
Externí odkaz:
http://arxiv.org/abs/2205.09610
We analyse the geometry of a spherically symmetric black hole with an inner and outer apparent horizon which is perturbed by spherical null shells of matter. On a classical level we observe that the mass inflation instability is triggered, resulting
Externí odkaz:
http://arxiv.org/abs/2203.13539
In this work we analyse the backreaction of a quantum field on a spherically symmetric black hole geometry with an inner horizon, i.e. an internal boundary of the trapped region. We start with a black hole background with an inner horizon which remai
Externí odkaz:
http://arxiv.org/abs/2011.07331
General relativity predicts its own demise at singularities, but also appears to conveniently shield itself from the catastrophic consequences of such singularities, making them safe. For instance, if strong cosmic censorship were ultimately satisfie
Externí odkaz:
http://arxiv.org/abs/2010.09048