3 papers
gr-qc2026
Defining higher memory signals and forecasting their observation prospects for binary-black-hole mergers with next-generation gravitational-wave detectors
Siddhant Siddhant, Alexander M. Grant, David A. Nichols
In asymptotically flat spacetimes far from an isolated source, gravitational waves (GWs) undergo nonlinear interactions with themselves and with the parts of the spacetime curvatur…
gr-qc2024
Higher memory effects and the post-Newtonian calculation of their gravitational-wave signals
Siddhant Siddhant, Alexander M. Grant, David A. Nichols
A new hierarchy of lasting gravitational-wave effects (the higher memory effects) was recently identified in asymptotically flat spacetimes, with the better-known displacement, spi…
gr-qc2020
Kundt geometries and memory effects in the Brans-Dicke theory of gravity
Siddhant Siddhant, Indranil Chakraborty, Sayan Kar
Memory effects are studied in the simplest scalar-tensor theory, the Brans--Dicke (BD) theory. To this end, we introduce, in BD theory, novel Kundt spacetimes (without and with gyr…