309 citations · 845 across the 18 of their papers we have counts for
18 papers
Big Bang in Dipole Cosmology
A. Allahyari, E. Ebrahimian, R. Mondol +1
We continue the study of dipole cosmology framework put forward in \cite{Krishnan:2022qbv}, a beyond FLRW setting that has a preferred direction in the metric which may be associat…
Emergent Universe from Energy-Momentum Squared Gravity
Mohsen Khodadi, Alireza Allahyari, Salvatore Capozziello
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 Gra…
No slip gravity in light of LISA standard sirens
Alireza Allahyari, Rafael C. Nunes, David F. Mota
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…
Testing No-Hair Theorem by Quasi-Periodic Oscillations: the quadrupole of GRO J165540
Alireza Allahyari, Lijing Shao
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 H…
Black holes with scalar hair in light of the Event Horizon Telescope
Mohsen Khodadi, Alireza Allahyari, Sunny Vagnozzi +1
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 addit…
Bounds on the Horndeski Gauge-Gravity Coupling
Alireza Allahyari, Mohammad Ali Gorji, Shinji Mukohyama
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…