179 citations · 1k across the 58 of their papers we have counts for
9 papers · 1 filter
Oscillations and parity violation in gravitational wave background from extra tensor modes
Jaume Garriga, Mohammad Ali Gorji, Fazlollah Hajkarim +1
Spectator fields which provide additional tensor degrees of freedom, on top of the standard metric tensor perturbations, can produce significant amounts of gravitational waves (GWs…
Peaks sphericity of non-Gaussian random fields
Cristiano Germani, Mohammad Ali Gorji, Michiru Uwabo-Niibo +1
We formulate the statistics of peaks of non-Gaussian random fields and implement it to study the sphericity of peaks. For non-Gaussianity of the local type, we present a general fo…
Dark matter from inflationary quantum fluctuations
Mohammad Ali Gorji, Misao Sasaki, Teruaki Suyama
We explore a scenario in which dark matter is a massive bosonic field, arising solely from quantum fluctuations generated during inflation. In this framework, dark matter exhibits…
CMB spectrum in unified EFT of dark energy: scalar-tensor and vector-tensor theories
Katsuki Aoki, Mohammad Ali Gorji, Takashi Hiramatsu +3
We study the cosmic microwave background (CMB) radiation in the unified description of the effective field theory (EFT) of dark energy that accommodates both scalar-tensor and vect…
Extra-tensor-induced origin for the PTA signal: No primordial black hole production
Mohammad Ali Gorji, Misao Sasaki, Teruaki Suyama
Recently, pulsar timing array (PTA) collaborations announced evidence for an isotropic stochastic gravitational wave (GW) background. The origin of the PTA signal can be astrophysi…
Spin-2 dark matter from inflation
Mohammad Ali Gorji
The seed of dark matter can be generated from light spectator fields during inflation through a similar mechanism that the seed of observed large scale structures are produced from…