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-qc2023
Fully nonlinear transformations of the Weyl-Bondi-Metzner-Sachs asymptotic symmetry group
Eanna E. Flanagan, David A. Nichols
The asymptotic symmetry group of general relativity in asymptotically flat spacetimes can be extended from the Bondi-Metzner-Sachs (BMS) group to the generalized BMS (GMBS) group s…