Cosmological absorption of gravitational waves
Abstract
SEVERAL people have investigated the absorption of electromagnetic and neutrino waves in cosmological models and discussed the selfconsistency or otherwise, in the WheelerFeynman absorber theory of radiation, of retarded and advanced fields; a solution of the field equations is selfconsistent if the absorption tends to completeness as the field propagates. Cosmological absorption of gravitational waves has been treated briefly by Hawking^{1}. Here, the completeness or otherwise of the absorption of retarded and advanced gravitational waves will be investigated using a technique introduced, in the case of electromagnetic absorption, by Davies^{2}; the technique applies to the RobertsonWalker cosmologies of arbitrary spatial curvature.
 Publication:

Nature
 Pub Date:
 March 1975
 DOI:
 10.1038/254205a0
 Bibcode:
 1975Natur.254..205B
 Keywords:

 Astronomical Models;
 Cosmology;
 Gravitational Waves;
 Radiation Absorption;
 Big Bang Cosmology;
 Field Theory (Physics);
 Mean Free Path;
 Pair Production;
 Refractivity;
 Relativity;
 Astrophysics