179 citations · 1k across the 58 of their papers we have counts for
9 papers · 1 filter
Dark photon dark matter from charged inflaton
Hassan Firouzjahi, Mohammad Ali Gorji, Shinji Mukohyama +1
We present a scenario of vector dark matter production during inflation containing a complex inflaton field which is charged under a dark gauge field and which has a symmetry break…
Vector dark matter production from inflation with symmetry breaking
Borna Salehian, Mohammad Ali Gorji, Hassan Firouzjahi +1
We present a scenario of vector dark matter production from symmetry breaking at the end of inflation. In this model, the accumulated energy density associated with the quantum flu…
Inflationary gravitational waves in consistent Einstein-Gauss-Bonnet gravity
Katsuki Aoki, Mohammad Ali Gorji, Shuntaro Mizuno +1
We study the slow-roll single field inflation in the context of the consistent Einstein-Gauss-Bonnet gravity that was recently proposed in \cite{Aoki:2020lig}. In addition…
Stealth dark energy in scordatura DHOST theory
Mohammad Ali Gorji, Hayato Motohashi, Shinji Mukohyama
A stealth de Sitter solution in scalar-tensor theories has an exact de Sitter background metric and a nontrivial scalar field profile. Recently, in the context of Degenerate Higher…
Inflation with multiple vector fields and non-Gaussianities
Mohammad Ali Gorji, Seyed Ali Hosseini Mansoori, Hassan Firouzjahi
We consider a model of inflation consisting a triplet of vector fields with the parity violating interaction which is non-minimally coupled to inflaton. The vector field sec…
Analytic study of dark photon and gravitational wave production from axion
Borna Salehian, Mohammad Ali Gorji, Shinji Mukohyama +1
Axion-like fields heavier than about eV are expected to oscillate in the radiation dominated epoch when the Hubble parameter drops below their mass. Considering the Chern…
Cosmology and gravitational waves in consistent Einstein-Gauss-Bonnet gravity
Katsuki Aoki, Mohammad Ali Gorji, Shinji Mukohyama
In a very recent paper [1], we have proposed a novel -dimensional gravitational theory with two dynamical degrees of freedom, which serves as a consistent realization of …
A consistent theory of Einstein-Gauss-Bonnet gravity
Katsuki Aoki, Mohammad Ali Gorji, Shinji Mukohyama
We investigate the limit of the -dimensional Einstein-Gauss-Bonnet gravity, where the limit is taken with kept fixed and is the original…
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…