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8 papers · 2 filters
Generators of Local Lorentz Transformation in ADM-Vielbein Formalism of Gravitational Relativity
Alireza Faraji, Zahra Molaee, Ahmad Shirzad
General relativity contains 16 variables in the framework of ADM-Vielbein formalism which are 6 more than metric formalism. These variables emerge due to additional symmetry of Loc…
On the Gravitational Hysteresis in the Kinetic Theory
Raihaneh Moti, Ali Shojai
General theory of relativity is non--linear in nature and therefore can result in hysteresis-like effects and cause systems to remember the footprint of the gravitational field. He…
Local Peculiar Motions in McVittie and LTB Spacetimes
Masoud Molaei, Shant Baghram, Bahram Mashhoon
We consider two inhomogeneous cosmological models, namely, the flat McVittie spacetime and a simple specific LTB spacetime. Relative to the world line of a reference comoving obser…
A note on the stability of the Cauchy horizon in regular black holes without mass inflation
Mohsen Khodadi, Javad T. Firouzjaee
Unlike generic models of regular black holes (BHs) with nonzero surface gravity on both Cauchy and event horizons, an inner-degenerate counterpart with zero Cauchy horizon surface…
Event Horizon Telescope observations exclude compact objects in baseline mimetic gravity
Mohsen Khodadi, Sunny Vagnozzi, Javad T. Firouzjaee
Mimetic gravity has gained significant appeal in cosmological contexts, but static spherically symmetric space-times within the baseline theory are highly non-trivial: the two natu…
McVittie-Plummer Spacetime: Plummer Sphere Immersed in the FLRW Universe
Javad Tabatabaei, Shant Baghram, Bahram Mashhoon
The McVittie-Plummer spacetime is a spherically symmetric inhomogeneous cosmological model that represents a spherical star system embedded in a standard FLRW cosmological model. W…