Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980nciml..28..221r&link_type=abstract
Nuovo Cimento, Lettere, Serie 2, vol. 28, June 7, 1980, p. 221-224.
Astronomy and Astrophysics
Astronomy
1
Black Holes (Astronomy), Cosmology, Relativity, Tensor Analysis, Astronomical Models, Schwarzschild Metric, Singularity (Mathematics)
Scientific paper
Implications of the bimetric theory of general relativity, in which both a physical metric tensor and a background metric tensor are used to describe space-time, for the existence of singularities including black holes are considered. It is noted that the field equations derived from the bimetric theory permit isotropic cosmological models without singularities, but which are in agreement with observations of such parameters as cosmic helium abundance and particle fields in the solar system. For regions inside the Schwarzschild sphere such as collapsed massive stars, however, the equations predict conditions to be unphysical, with freely falling particles or light rays to be turned back at the surface and neither particles nor light able to escape. Such a model of a collapsed star would allow the accretion of particles with nearly zero velocity and the ejection of matter in violent collisions, without invoking the existence of a black hole, where a singularity of the curvature tensor exists.
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