Work

Ricci Semi-Symmetric Bulk Viscous String Fluid Spacetime in F(R,T)-Gravity and Energy Constraints for Penrose Theorem

Year: 2026

Type: article

Abstract: This study is dedicated to a separable F(R,T)-gravity related to the bulk viscous string fluid to extract the equation of state for F(R,T)-gravity. In this research, we offer an insight into calculating the density and pressure in terms of string tension in the phantom barrier, stiff fluid, and matter-dominated eras. As demonstrated, if a spacetime in F(R,T)-gravity is full of bulk viscous string fluid matter, it is a generalized quasi-Einstein spacetime. In addition, we determine the equation of state of Ricci semi-symmetric and Ricci pseudo-symmetric spacetime in F(R,T)-gravity filled with bulk viscous string fluid matter. Finally, we try to give the energy constraints in view of Penrose’s singularity theorem of black holes for the spacetime in F(R,T)-gravity attached to bulk viscous string fluid.

Source: Axioms

DOI: 10.3390/axioms15070488

Authors: Mohd Danish Siddiqi, Ibrahim Al-Dayel, Sharief Deshmukh

Institutions: Jazan University, Imam Mohammad ibn Saud Islamic University, King Saud University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funder: Al-Imam Muhammad Ibn Saud Islamic University