309 citations · 845 across the 18 of their papers we have counts for
7 papers · 1 filter
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…
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…
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…
Black hole shadow with a cosmological constant for cosmological observers
Javad T. Firouzjaee, Alireza Allahyari
We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological c…
Imprints of local lightcone projection effects on the galaxy bispectrum IV: Second-order vector and tensor contributions
Sheean Jolicoeur, Alireza Allahyari, Chris Clarkson +3
The galaxy bispectrum on scales around and above the equality scale receives contributions from relativistic effects. Some of these arise from lightcone deformation effects, which…
Long gradient mode and large-scale structure observables
Alireza Allahyari, Javad T. Firouzjaee
We extend the study of long mode perturbations to other large scale observables such as cosmic rulers, galaxy number counts and halo bias. The long mode is a pure gradient mode tha…
Long gradient mode and large-scale structure observables I: linear order
Alireza Allahyari, Javad T. Firouzjaee
We study the effect of long gradient modes on large scale observables. When defined correctly, genuine observables should not only be gauge invariant but also devoid of any gauge a…