Zobrazeno 1 - 10
of 642
pro vyhledávání: '"Sarkar, Sudipta"'
If the graviton possesses a non-zero charge $q_g$, gravitational waves (GW) originating from astrophysical sources would experience an additional time delay due to intergalactic magnetic fields. This would result in a modification of the phase evolut
Externí odkaz:
http://arxiv.org/abs/2405.05038
Autor:
Acharya, Soham, Sarkar, Sudipta
The black hole no-short hair theorem establishes a universal lower bound on the extension of hairs outside any 4-dimensional spherically symmetric black hole solutions. We generalise this theorem beyond spherical symmetry, specifically for static, ax
Externí odkaz:
http://arxiv.org/abs/2402.09044
Publikováno v:
Phys.Rev.D 109 (2024) 6, 064025
Love numbers of compact objects quantify their tidal deformability against external perturbations. It is expected that Love numbers of asymptotically flat black holes (BHs) in General Relativity are identically zero. We show that quite contrary to co
Externí odkaz:
http://arxiv.org/abs/2401.06467
Publikováno v:
Phys.Rev.D 109 (2024) 4, L041505
Black hole solutions of general relativity exhibit a symmetry for the static perturbations around these spacetimes, known as "ladder symmetry". This symmetry proves useful in constructing a tower of solutions for perturbations and elucidating their g
Externí odkaz:
http://arxiv.org/abs/2401.00703
Publikováno v:
JHEP 07 (2024) 214
We consider a congruence of null geodesics in the presence of a quantized spacetime metric. The coupling to a quantum metric induces fluctuations in the congruence; we calculate the change in the area of a pencil of geodesics induced by such fluctuat
Externí odkaz:
http://arxiv.org/abs/2312.17214
Publikováno v:
Phys.Rev.D 109 (2024) 4, 046001
We investigate the ergoregion instability of area-quantized rotating quantum black holes (QBH) under gravitational perturbation. We show that the instability can be avoided in binary systems that include QBHs if the separation between the inspirallin
Externí odkaz:
http://arxiv.org/abs/2310.18022
Publikováno v:
Phys.Rev.D 108 (2023) 4, L041501
Several hairy black hole solutions are known to violate the original version of the celebrated no-hair conjecture. This prompted the development of a new theorem that establishes a universal lower bound on the extension of hairs outside any $4$-dimen
Externí odkaz:
http://arxiv.org/abs/2306.14193
Autor:
Sk, Selim, Sarkar, Sudipta
Among all the different techniques to derive the Hawking effect, the approach based on gravitational anomaly by Robinson and Wilczek provides a simple and satisfactory origin of the black hole radiation. In this picture, the effective near horizon ph
Externí odkaz:
http://arxiv.org/abs/2306.00496
The second postulate of special relativity states that the speed of light in vacuum is independent of the emitter's motion. The test of this postulate so far remains unexplored for gravitational radiation. We analyze data from the LIGO-Virgo detector
Externí odkaz:
http://arxiv.org/abs/2304.14820
Autor:
Sarkar, Sudipta, Shukla, Niraj K.
This article discusses the construction of dual frames and their uniqueness for the multiplication generated frames on $L^2(X; \mathcal H)$, where $X$ is a $\sigma$-finite measure. A necessary and sufficient condition of such duals associated to infi
Externí odkaz:
http://arxiv.org/abs/2301.07448