Propagation of massless scalar field in standard-like cosmological models.

Details Propagation of massless scalar field in standard-like cosmological models. Propagation of massless scalar field in standard-like cosmological models.

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ncimb.114..635z&link_type=abstract

Nuovo Cimento B, Vol. 114B, No. 6, p. 635 - 642

Mathematics

Logic

Scientific paper

The propagation of the massless scalar waves in Robertson-Walker space-times does not lie, in general, on the light cones and is very sensible to the underlying cosmological time evolution. This can be put in particular evidence for a class of Robertson-Walker space-times by means of the previously determined explicit solutions of the corresponding massless generalized Klein-Gordon equation. A simple condition on the parameters of the cosmological model (that is satisfied in Standard Cosmology) is determined such that the massless scalar field has a tail-free propagation, that is it entirely propagates on the light cones. The property is proved for a countable set of values of the coupling constant between the scalar field and the gravitational field that includes the minimally and the conformally coupled case.

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