134 citations · 904 across the 47 of their papers we have counts for
47 papers
On a cosmological Oppenheimer-Snyder model: matching McVittie and FLRW spacetimes
Brien C. Nolan
We consider the necessary and sufficient conditions for the smooth matching of an expanding McVittie spacetime and a spatially flat Friedmann-Lema\^ıtre-Robertson-Walker (FLRW) spa…
Calculation of a regularized Teukolsky Green function in Schwarzschild spacetime
David Q. Aruquipa, Marc Casals, Brien C. Nolan
We obtain exact expressions for various factors involved in the Hadamard form of the retarded Green function for the (Bardeen-Press-)Teukolsky equation on Schwarzschild spacetime.…
Can you fall into a McVittie black hole? Will you survive?
Brien C. Nolan
Yes and maybe. In contrast to the fluid particles of this perfect fluid spacetime which follow non-geodesic world-lines and escape to infinity, we prove that freely-falling test pa…
Motion of a gyroscope on a closed timelike curve
Brien C. Nolan
We consider the motion of a gyroscope on a closed timelike curve (CTC). A gyroscope is identified with a unit-length spacelike vector - a spin-vector - orthogonal to the tangent to…
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…