2025

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Charged stellar filament and dark matter
(UMT Lahore, 2025-01-02) Sundas Shahzadi
This study delves into the dynamical behavior and structural instability of filamentary configurations in the presence of exotic matter, employing the palatini formulation of modified gravity, specifically the f(r,t) theory. In this framework the exotic matter is represented through a non-minimal coupling between geometry and the trace of the energy-momentum tensor, which introduces novel features not present in standard general relativity. To analyze the collapse dynamics of these structures, we implement the darmois junction conditions at the boundary surface, ensuring a smooth matching between the interior and exterior spacetime geometries. Through this approach, we derive a collapse equation that governs the evolution of the system. Notably, at the boundary, the radial pressure does not vanish; instead, it exhibits a dependence on a dynamically evolving field term, highlighting the persistent influence of exotic components overtime. Additionally, the study explores the interaction between dark matter and gravitational waves in this extended gravity regime. The results indicate that the presence of exotic terms leads to a suppression of gravitational wave transmission, suggesting that such matter components can act as a barrier to wave propagation, thereby altering the observational signatures of gravitational phenomena in regions dominated by exotic or dark matter.