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6 papers · 2 filters
Persistent gravitational wave observables: Nonlinear plane wave spacetimes
Éanna É. Flanagan, Alexander M. Grant, Abraham I. Harte +1
In the first paper in this series, we introduced "persistent gravitational wave observables" as a framework for generalizing the gravitational wave memory effect. These observables…
Causality violation without time-travel: closed lightlike paths in Gödel's universe
Brien C. Nolan
We revisit the issue of causality violations in Gödel's universe, restricting to geodesic motions. It is well-known that while there are closed timelike curves in this spacetime, t…
Regularized calculation of the retarded Green function in Schwarzschild spacetime
Marc Casals, Brien C. Nolan, Adrian C. Ottewill +1
The retarded Green function for linear field perturbations of black hole spacetimes is notoriously difficult to calculate. One of the difficulties is due to a Dirac- divergence…
Parity-Violating Gravity and GW170817 in Non-Riemannian Cosmology
Aindriú Conroy, Tomi Koivisto
The cosmological propagation of tensor perturbations is studied in the context of parity-violating extensions of the symmetric teleparallel equivalent of General Relativity theory.…
Gravitational lensing beyond geometric optics: II. Metric independence
Abraham I. Harte
Typical applications of gravitational lensing use the properties of electromagnetic or gravitational waves to infer the geometry through which those waves propagate. Nevertheless,…
Persistent gravitational wave observables: general framework
Éanna É. Flanagan, Alexander M. Grant, Abraham I. Harte +1
The gravitational wave memory effect is characterized by the permanent relative displacement of a pair of initially comoving test particles that is caused by the passage of a burst…