Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Allahyari, Alireza"'
We investigate quasi-periodic oscillations (QPOs) in the context of a new rotating black hole solution that incorporates a cosmological constant. Recent work by the authors in \cite{Ovalle:2022eqb} interpreted the cosmological constant, denoted as $\
Externí odkaz:
http://arxiv.org/abs/2410.08955
We perform an observational study of modified gravity considering a potential inflationary interpretation of pulsar timing arrays (PTA). We use a motivated model known as no slip in which the gravitational wave propagation is modified. Specifically,
Externí odkaz:
http://arxiv.org/abs/2409.05956
Publikováno v:
Journal of Cosmology and Astroparticle Physics (2024)
We study the Barrow cosmological model, which proposes that quantum gravity effects create a complex, fractal structure for the universe's apparent horizon. We leverage the thermodynamics - gravity conjecture. By applying the Clausius relation to the
Externí odkaz:
http://arxiv.org/abs/2404.13025
Autor:
Vagnozzi, Sunny, Roy, Rittick, Tsai, Yu-Dai, Visinelli, Luca, Afrin, Misba, Allahyari, Alireza, Bambhaniya, Parth, Dey, Dipanjan, Ghosh, Sushant G., Joshi, Pankaj S., Jusufi, Kimet, Khodadi, Mohsen, Walia, Rahul Kumar, Övgün, Ali, Bambi, Cosimo
Publikováno v:
Class. Quant. Grav. 40 (2023) 165007
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We consider a wide range of well-motivated deviations from classical General Rel
Externí odkaz:
http://arxiv.org/abs/2205.07787
Publikováno v:
In Journal of High Energy Astrophysics March 2025 45:125-134
Publikováno v:
Phys.Dark Univ. 36 (2022) 101013
In order to bypass the big bang singularity, we develop an emergent universe scenario within a covariant extension of General Relativity known as \emph{"Energy-Momentum Squared Gravity"}. The extra terms of the model emerge in the high energy regime.
Externí odkaz:
http://arxiv.org/abs/2203.13496
Standard sirens (SS) are the gravitational wave analog of the astronomical standard candles, and can provide powerful information about the dynamics of the Universe up to very high $z$ values. In this work, we generate three mock SS catalogs based on
Externí odkaz:
http://arxiv.org/abs/2110.07634
Autor:
Allahyari, Alireza, Shao, Lijing
Publikováno v:
JCAP10(2021)003
We perform an observational test of no-hair theorem using quasi-periodic oscillations within the relativistic precession model. Two well motivated metrics we apply are Kerr-Q and Hartle-Thorne metrics in which the quadrupole is the parameter that pos
Externí odkaz:
http://arxiv.org/abs/2102.02232
Publikováno v:
JCAP 2009 (2020) 026
Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and more generally fundamental physics, particularly with regards to the existence of additional scalar fields. The first observation of a black hole (BH) shadow
Externí odkaz:
http://arxiv.org/abs/2005.05992
The Horndeski gauge-gravity coupling is the leading non-minimal interaction between gravity and gauge bosons, and it preserves all the symmetries and the number of physical degrees of freedom of the standard model of particle physics and general rela
Externí odkaz:
http://arxiv.org/abs/2002.11932