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8 papers · 1 filter
Gravitational wave interactions with a viscous fluid: Core collapse supernova, binary neutron star merger, and accretion around a black hole merger
Nigel T. Bishop, Vishnu Kakkat, Monos Naidoo
The interaction of gravitational waves (GWs) with matter is normally treated as being insignificant. However, recent work has shown that the interaction with a viscous fluid may be…
Cosmological Evolution, Analytical Parametrization, and Dynamical Stability of a Bouncing Universe in Non-Minimal Kinetic Coupling Gravity
Alireza Amani, A. S. Kubeka, E. Mahichi
In this paper, the bouncing cosmology is studied in the framework of the non-minimal kinetic coupling theory between the scalar field and the Einstein tensor. After deriving the mo…
Gravitational Wave Heating
Vishnu Kakkat, Nigel T. Bishop, Amos S. Kubeka
It was shown in previous work that when a gravitational wave (GW) passes through a viscous shell of matter the magnitude of the GW will be damped and there are astrohysical circums…
Relativistic compact stars in Tolman spacetime via an anisotropic approach
Piyali Bhar, Pramit Rej, P. Mafa Takisa +1
In this present work, we have obtained a singularity-free spherically symmetric stellar model with anisotropic pressure in the background of Einstein's general theory of relativity…
Quasi-Normal Modes of a Schwarzschild White Hole
Nigel T. Bishop, Amos S. Kubeka
We investigate perturbations of the Schwarzschild geometry using a linearization of the Einstein vacuum equations within a Bondi-Sachs, or null cone, formalism. We develop a numeri…
Strategies for the Characteristic Extraction of Gravitational Waveforms
M. C. Babiuc, N. T. Bishop, B. Szilagyi +1
We develop, test and compare new numerical and geometrical methods for improving the accuracy of extracting waveforms using characteristic evolution. The new numerical method invol…