32 citations · 188 across the 17 of their papers we have counts for
5 papers · 1 filter
White Hole Cosmology and Hawking Radiation from Quantum Cosmological Perturbations
Hassan Firouzjahi, Alireza Talebian
The spacetime inside the white hole is like an anisotropic cosmological background with the past singularity playing the role of a big bang singularity. The scale factor along the…
Inflation from Multiple Pseudo-Scalar Fields: PBH Dark Matter and Gravitational Waves
Alireza Talebian, Seyed Ali Hosseini Mansoori, Hassan Firouzjahi
We study a model of inflation with multiple pseudo-scalar fields coupled to a gauge field through Chern-Simons interactions. Because of parity violating interactions, one po…
Multiple transitions in vacuum dark energy and tension
Hossein Moshafi, Hassan Firouzjahi, Alireza Talebian
We study the effects of multiple transitions in the vacuum dark energy density on the tension problem. We consider a phenomenological model in which the vacuum energy density…
Stochastic Effects in Axion Inflation and Primordial Black Holes Formation
Alireza Talebian, Amin Nassiri-Rad, Hassan Firouzjahi
We revisit the model of axion inflation in the context of stochastic inflation and investigate the effects of the stochastic noises associated to the electromagnetic fields. Becaus…
Multiple Field Ultra Slow Roll Inflation: Primordial Black Holes From Straight Bulk And Distorted Boundary
Sina Hooshangi, Alireza Talebian, Mohammad Hossein Namjoo +1
We study a model of two-field ultra-slow-roll (USR) inflation bounded by a curve in the field space. Curvature perturbations and non-Gaussianities can be enhanced both during the U…