Zobrazeno 1 - 10
of 9 328
pro vyhledávání: '"A. Liberati"'
In a series of recent papers we put forward a ``fractional gravity'' framework striking an intermediate course between a modified gravity theory and an exotic dark matter (DM) scenario, which envisages the DM component in virialized halos to feel a n
Externí odkaz:
http://arxiv.org/abs/2407.16787
This investigation delves into the ringdown signals produced by semiclassical stars, which are ultra-compact, regular solutions of the Einstein equations incorporating stress-energy contributions from quantum vacuum polarization. These stars exhibit
Externí odkaz:
http://arxiv.org/abs/2407.08807
Analogue Hawking radiation from acoustic horizons is now a well-established phenomenon, both theoretically and experimentally. Its persistence, despite the modified dispersion relations characterising analogue models, has been crucial in advancing ou
Externí odkaz:
http://arxiv.org/abs/2406.14603
While the standard point of view is that the ultimate endpoint of black hole evolution is determined by Hawking evaporation, there is a growing evidence that classical and semi-classical instabilities affect both black holes with inner horizons as we
Externí odkaz:
http://arxiv.org/abs/2405.08069
Autor:
Neri, Giulio, Liberati, Stefano
This work introduces a novel prescription for the expression of the thermodynamic potentials associated with the couplings of a Lanczos-Lovelock theory. These potentials emerge in theories with multiple couplings, where the ratio between them provide
Externí odkaz:
http://arxiv.org/abs/2404.16981
Singularity theorems demonstrate the inevitable breakdown of the concept of continuous, classical spacetime under highly general conditions. Quantum gravity is expected to intervene to avoid singularities and models so far hint towards several regula
Externí odkaz:
http://arxiv.org/abs/2404.13112
Mass inflation is a well established instability, conventionally associated to Cauchy horizons (which are also inner trapping horizons) of stationary geometries, leading to a divergent exponential buildup of energy. We show here that finite (but ofte
Externí odkaz:
http://arxiv.org/abs/2402.14913
Publikováno v:
Phys. Rev. D 109 (2024) 8, 084028
While non-rotating black-hole solutions are well known in Einstein--\ae{}ther gravity, no axisymmetric solutions endowed with Killing horizons have been so far found outside of the slowly rotating limit. Here we show that the Kerr spacetime is also a
Externí odkaz:
http://arxiv.org/abs/2312.06891
While the robustness of Hawking radiation in the presence of UV Lorentz breaking is well-established, the Unruh effect has posed a challenge, with a large literature concluding that even the low-energy restoration of Lorentz invariance may not be suf
Externí odkaz:
http://arxiv.org/abs/2312.03070
Publikováno v:
JCAP01(2024)020
We study gravitational and test-field perturbations for the two possible families of spherically symmetric black-hole mimickers that smoothly interpolate between regular black holes and horizonless compact objects accordingly to the value of a regula
Externí odkaz:
http://arxiv.org/abs/2310.11990