3 papers
gr-qc2020
Probing the post-Minkowskian approximation using recursive addition of self-interactions
Soumendra Kishore Roy, Ratna Koley, Parthasarathi Majumdar
We address the problem of deriving the post-Minkowskian approximation, widely used in current gravitational wave literature by investigating a possible deduction out of the recursi…
astro-ph.CO2020
Prospects of probing dark energy with eLISA: Standard versus null diagnostics
Pratyusava Baral, Soumendra Kishore Roy, Supratik Pal
Gravitational waves from supermassive black hole binary mergers along with an electromagnetic counterpart have the potential to shed `light' on the nature of dark energy in the int…
gr-qc2019
Kinematics of Two-particle Scattering in Black Hole Backgrounds
Soumendra Kishore Roy, Ratna Koley, Parthasarathi Majumdar
We show that particle scattering in general curved backgrounds entails {\it six} independent, kinematical Mandelstam-like invariants, instead of the two in flat spacetime. Spacetim…