19 citations · 53 across the 12 of their papers we have counts for
12 papers
A class of -dimensional regular black holes: Shadows, Thermodynamics and Gravitational collapse
A. Sadeghi, F. Shojai
We investigate a general class of -dimensional regular black holes characterized by a de Sitter core, which arises from the gravitational collapse of a polytropic star with an a…
Cosmological Black hole Candidates: A Detailed Analysis of McVittie, Culetu, Sultana-Dyer, and Glass-Mashhoon Spacetimes
M. Esfandiar, F. Shojai, O. Zamani Jamshidi +1
This paper investigates the existence of cosmological black holes by analyzing the properties of trapping horizons in detail, based on Hayward's formalism of future outer and past…
Gravitational Collapse: Generalizing Oppenheimer-Snyder and a Conjecture on Horizon Formation Time
H. Khodabakhshi, H. Lu, F. Shojai
We generalize the Oppenheimer-Snyder model of gravitational collapse by considering a broader class of static, spherically symmetric exterior spacetimes, with an interior geometry…
Gravitational Landscapes: black holes with linear equations of state in asymptotically safe gravity
Ramin Hassannejad, Fatimah Shojai, Kazuharu Bamba
We study black holes with linear equation of state within the framework of asymptotically safe gravity. This study extends previous work on gravitational collapse in asymptotically…
Gravitational Collapse in Scale-Dependent Gravity
Ramin Hassannejad, Gaetano Lambiase, Fabio Scardigli +1
In this paper we study an Oppenheimer-Snyder (OS)-like gravitational collapse in the general framework of scale-dependent gravity. We explore the collapse in spherically symmetric…
Weak Energy Condition, Trapped Surfaces and Black hole Third Law
F. Bahmani, F. Shojai, Sh. Anjomshoaa
We consider the third law of thermodynamics for families of 4- and n-dimensional Vaidya black holes, including many of interest. Since there are several versions of the definition…
Cosmology with Higher-Derivative Gravities
H. Khodabakhshi, M. Farhang, F. Shojai +1
We introduce an ingenious approach to explore cosmological implications of higher-derivative gravity theories. The key novelty lies in the characterization of the additional massiv…
Surface gravity in spherically symmetric collapsing stars
A. Sadeghi, F. Shojai, F. Bahmani
Here we consider the generalized Oppenheimer-Snyder collapse of a star into a four-dimensional Einstein-Gauss-Bonnet black hole as well as a class of regular black holes labeled by…
Cosmological Time Crystals from Gauss-Bonnet Gravity in Four Dimensions
H. Khodabakhshi, F. Shojai, H. Lü
We investigate various cosmological aspects of a 4-Dimensional Gauss-Bonnet Lagrangian, which is integrated into the Einstein Lagrangian with an arbitrary sign, using the Friedman-…
Generalized Oppenheimer-Snyder Gravitational Collapse into Regular Black holes
F. Shojai, A. Sadeghi, R. Hassannejad
We shall study the formation of a particular class of regular black holes from the gravitational collapse of a massive star. The inside geometry is described by spatially flat Frie…
On the classification of consistent boundary conditions for -Gravity
H. Khodabakhshi, F. Shojai, A. Shirzad
Using a completely covariant approach, we discuss the role of boundary conditions (BCs) and the corresponding Gibbons--Hawking--York (GHY) terms in -gravi…
On the Relativistic anisotropic configurations
F. Shojai, M. Kohandel, A. Stepanian
In this paper we study anisotropic spherical polytropes within the framework of general relativity. Using the anisotropic Tolman-Oppenheimer-Volkov (TOV) equations, we explore the…