3 papers
gr-qc2026
Precision Ringdown Measurements of Binary Black Hole Remnants
Achal Kumar, Poulami Dutta Roy, Marek J. Szczepańczyk +1
The ringdown gravitational wave from a binary black hole (BBH) merger is a superposition of quasi-normal modes (QNMs) of the remnant black hole. In general relativity (GR), QNMs ar…
astro-ph.SR2024
Simulating super-Chandrasekhar white dwarfs
Zenia Zuraiq, Achal Kumar, Alexander J. Hackett +3
Over the last few decades, there has been considerable interest in the violation of the sacred "Chandrasekhar" mass limit of white dwarfs (WDs). Peculiar over-luminous type Ia supe…
gr-qc2022
Covariant formalism for the Berry connection due to gravity
Achal Kumar, Banibrata Mukhopadhyay
It is well-known that Dirac particles gain geometric phase, namely Berry phase, while moving in an electromagnetic field. Researchers have already shown covariant formalism for the…