31 citations · 149 across the 11 of their papers we have counts for
8 papers · 1 filter
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…
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…
Why the measured cosmological constant is small
T. Rostami, S. Jalalzadeh
In a quest to explain the small value of the today's cosmological constant, following the approach introduced in [1], we show that the theoretical value of cosmological constant is…
Quantum cosmological intertwining: Factor ordering and boundary conditions from hidden symmetries
T. Rostami, S. Jalalzadeh, P. V. Moniz
We explore the implications of hidden symmetries present in a particular quantum cosmological setting, extending the results reported in \cite{10,11}. In more detail, our case stud…
Five dimensional cosmological traversable wormhole
S. Najafi, T. Rostami, S. Jalalzadeh
In this paper, a traversable wormhole in the Friedmann-Lema\^ıtre-Robertson-Walker (FLRW) model with one extra spacelike compact dimension is studied. We have chosen dynamical comp…