24 citations · 89 across the 12 of their papers we have counts for
10 papers · 1 filter
Correlation of Horizons and Black Hole Thermodynamics
Sanam Azarnia, S. Sedigheh Hashemi
For black holes with more than one horizon, the existence of a global temperature is not fully understood. This can affect the thermodynamics of these black holes to be unclear. In…
Boosted Kaluza- Klein magnetic monopole
S. Sedigheh Hashemi, Nematollah Riazi
We consider a Kaluza-Klein vacuum solution which is closely related to the Gross-Perry-Sorkin (GPS) magnetic monopole. The solution can be obtained from the Euclidean Taub-NUT solu…
Boosted Cylindrical Magnetized Kaluza-Klein Wormhole
S. Sedigheh Hashemi, Nematollah Riazi
In this work, we consider a vacuum solution of Kaluza-Klein theory with cylindrical symmetry. We investigate the physical properties of the solution as viewed in four dimensional s…
Stephani Cosmology: Entropically Viable But Observationally Challenged
Yen Chin Ong, S. Sedigheh Hashemi, Rui An +1
Inhomogeneous cosmological models such as the Stephani universes could, in principle, provide an explanation for the observed accelerated expansion of the Universe. Working with a…
Vacuum thick brane solution with a Gaussian warp function
S. Sedigheh Hashemi, Nematollah Riazi
This work deals with modified gravity in five dimensional space-time. The Gaussian thick brane is shown to be an exact solution in the frame work of gravity in five d…
From Taub-NUT to Kaluza-Klein magnetic monopole
Nematollah Riazi, S. Sedigheh Hashemi
We present a Kaluza-Klien vacuum solution which closely resembles the Taub-NUT magnetic monopole and we investigate its physical properties as viewed from four space-time dimension…
Tachyon inflation with steep potentials
K. Rezazadeh, K. Karami, S. Hashemi
Within the framework of tachyon inflation, we consider different steep potentials and check their viability in light of the Planck 2015 data. We see that in this scenario, the inve…
Exact Anisotropic Solutions of the Generalized TOV Equation
Nematollah Riazi, S. Sedigheh Hashemi, S. Naseh Sajadi +1
We explore gravitating relativistic spheres composed of an anisotropic, barotropic uid. We assume a bi-polytropic equation of state which has a linear and a power-law terms. The ge…
Kaluza-Klein magnetic monopole a la Taub-NUT
N. Riazi, S. Hashemi
In this paper, we consider a new vacuum solution of the Kaluza-Klien theory which resembles the Taub-NUT metric in five dimensions and we investigate its physical properties as pro…
Dark side of the universe in the Stephani cosmology
S. Sedigheh. Hashemi, S. Jalalzadeh, N. Riazi
We investigate the late time acceleration of the universe in the context of the Stephani model. This solution generalizes those of Friedmann-Lemaitre-Robertson-Walker (FLRW) in suc…