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14 papers · 2 filters
Echoes from the Abyss: Tentative evidence for Planck-scale structure at black hole horizons
Jahed Abedi, Hannah Dykaar, Niayesh Afshordi
In classical General Relativity (GR), an observer falling into an astrophysical black hole is not expected to experience anything dramatic as she crosses the event horizon. However…
Charged Rotating AdS Black Holes with Chern-Simons coupling
Mozhgan Mir, Robert B. Mann
We obtain a perturbative solution for rotating charged black holes in 5-dimensional Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant. We start from a smal…
Foliation dependence of black hole apparent horizons in spherical symmetry
Valerio Faraoni, George F. R. Ellis, Javad T. Firouzjaee +2
Numerical studies of gravitational collapse to black holes make use of apparent horizons, which are intrinsically foliation-dependent. We expose the problem and discuss possible so…
\bf Formalism: A New Approach to Cosmological Perturbation Theory in Anisotropic Inflation
Alireza Talebian-Ashkezari, Nahid Ahmadi, Ali Akbar Abolhasani
We study the evolution of the metric perturbations in a Bianchi background in the long-wavelength limit. By applying the gradient expansion to the equations of motion we exhibit a…
Energy-Momentum Squared Gravity
Mahmood Roshan, Fatimah Shojai
A new covariant generalization of Einstein's general relativity is developed which allows the existence of a term proportional to in the action functional of the the…
Point mass Cosmological Black Holes
Javad T. Firouzjaee, Touhid Feghhi
Real black holes in the universe are located in the expanding accelerating background which are called the cosmological black holes. Hence, it is necessary to model these black hol…