Online Seminar “Ultracompact stars in the light of minimal geometric deformation”

Star-UBB Seminar Series:- Ultracompact stars in the light of minimal geometric deformation

In this talk, the speaker will present an analytical version of the charged gravastar model with non-uniform anisotropic features in the framework of f(R,T) theory. In order to introduce anisotropy in the system, he and his team consider the gravitational decoupling method by means of the Minimal Geometric Deformation(MGD). In the interior region, they obtain a family of interior solutions, which smoothly join a conformally deformed Reissner–Nordström exterior solution, as well as the standard Reissner–Nordström solution at the stellar boundary R = a(τ), where τ is the proper time. In both cases, they have different ranges of λ for the smooth joint at the stellar boundary. The ultra-compact interior solution representing a family of charged stellar models satisfies some of the fundamental properties of a stable configuration, which includes regularity at the center, positive energy density with monotonically decreasing behavior from the center outwards, and non-uniform pressure with monotonic profile. All the energy bounds except the strong one are satisfied inside the ultracompact interior for all the values of λ, compatible with regularity condition.

時間:2024.04.04(四) 16:00~17:30
頻道:Zoom ID:853-7454-4159 ←
講者:Dr. Muhammad Zubair (Department of Mathematics, COMSATS University Islamabad*, Lahore, Pakistan)


*کومسیٹس یونیورسٹی اسلام آباد

Scientific and Technological Advanced Research- Babeș-Bolyai University(Star-UBB) Seminar Series in Gravitation, Cosmology and Astrophysics

Presently a period of rapid and intense change are being witnessed in our understanding of the gravitational force, at a rate that is quickly increasing since the important observational discoveries of the late 1990s. With the advent of new observational techniques, the emergence of important cosmological and astrophysical paradigms can be seen that lead to a deep change in our understanding of the Universe. Astronomical observations strongly suggest that at large scales the force of gravity may not behave according to standard general relativity, and that a generalization of the gravitational action, either at the geometric level, or at the matter level, may be required for a full understanding of the gravitational interaction.

The goal of the present seminar is to bring Theoretical Gravitational Physics closer to the observations and experiments, and to discuss current topics in general relativity, high-energy physics, astrophysics and cosmology.


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