Strong Gravity News & Events

Both for studies of cosmic censorship and for practical purposes in gravitational wave astronomy, it is desirable to include future null-infinity in the computational domain. Extending formulations of general relativity known to behave well in the strong-field regime out to infinity with compactification is, however, a subtle game.

Equatorial EMRIs in KBHsSH Spacetimes
Lucas G. Collodel, Daniela D. Doneva, and Stoytcho S. Yazadjiev
arXiv:2108.11658 [gr-qc]

Despite the plethora of evidence of the existence and abundance of dark matter we have from large scale cosmological observations, there is still little we know of its properties or its behaviour on small scales. A promising way to test this is through the effects it may have on the gravitational wave signal from black hole binary mergers.

I summarize theoretical findings, astrophysical modeling, and current gravitational-wave evidence of hierarchical stellar-mass black-hole mergers.

The warp drive: hyper-fast travel within general relativity
Miguel Alcubierre
Class. Quant. Grav. 11 (1994) L73-L77