160 citations · 1.3k across the 49 of their papers we have counts for
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Spherical scalar waves and gravity - red shift and backscattering
Edward Malec, Niall Ó Murchadha, Tadeusz Chmaj
This article investigates the interaction of a spherically symmetric massless scalar field with a strong gravitational field. It focuses on the propagation of waves in regions outs…
Sufficient Conditions for Apparent Horizons in Spherically Symmetric Initial Data
Jemal Guven, Niall O Murchadha
We establish sufficient conditions for the appearance of apparent horizons in spherically symmetric initial data when spacetime is foliated extrinsically. Let and be respec…
Necessary Conditions for Apparent Horizons and Singularities in Spherically Symmetric Initial Data
Jemal Guven, Niall O Murchadha
We establish necessary conditions for the appearance of both apparent horizons and singularities in the initial data of spherically symmetric general relativity when spacetime is f…
Geometric Bounds in Spherically Symmetric General Relativity
Jemal Guven, Niall O Murchadha
We exploit an arbitrary extrinsic time foliation of spacetime to solve the constraints in spherically symmetric general relativity. Among such foliations there is a one parameter f…