81 citations · 277 across the 12 of their papers we have counts for
12 papers
Vacuum decay in the presence of a cosmic string
Hassan Firouzjahi, Asieh Karami, Tahereh Rostami
We study the false vacuum decay and bubble nucleation in the presence of a cosmic string in dS spacetime. A cosmic string induces a deficit angle in spacetime around itself so the…
Charged Vector Inflation
Hassan Firouzjahi, Mohammad Ali Gorji, Seyed Ali Hosseini Mansoori +2
We present a model of inflation in which the inflaton field is charged under a triplet of gauge fields. The model enjoys an internal symmetry supporting the isotropic…
Two-field disformal transformation and mimetic cosmology
Hassan Firouzjahi, Mohammad Ali Gorji, Seyed Ali Hosseini Mansoori +2
We extend the disformal transformation to models with two scalar fields and look at its singular limit. Solving the eigentensor equation for the Jacobian of the transformation of t…
Bubble nucleation and inflationary perturbations
Hassan Firouzjahi, Sadra Jazayeri, Asieh Karami +1
In this work we study the imprints of bubble nucleation on primordial inflationary perturbations. We assume that the bubble is formed via the tunneling of a spectator field from th…
Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
Tahereh Rostami, Asieh Karami, Hassan Firouzjahi
We present the effective field theory studies of primordial statistical anisotropies in models of anisotropic inflation. The general action in unitary gauge is presented to calcula…
Primordial inhomogeneities from massive defects during inflation
Hassan Firouzjahi, Asieh Karami, Tahereh Rostami
We consider the imprints of local massive defects, such as a black hole or a massive monopole, during inflation. The massive defect breaks the background homogeneity. We consider t…