Mild inflation and modified general relativity in the early universe.

Details Mild inflation and modified general relativity in the early universe. Mild inflation and modified general relativity in the early universe.

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ijtp...38.2419d&link_type=abstract

International Journal of Theoretical Physics, Vol. 38, No. 9, p. 2419 - 2440

Physics

Cosmology: Inflationary Universe, Early Universe: General Relativity, Early Universe: Particle Creation

Scientific paper

This article deals with particle creation and the production of the specific entropy per baryon in the early universe. The modified general relativity (MGR) theory of Rastall (1972), Al-Rawaf and Taha (1996) is employed. It contains an extra independent constant η which is peculiar to the non-Newtonian regime, besides the usual gravitational constant. Usual general relativity (GR) appears here as a special case for η = 1. With a modified thermodynamic energy conservation law, it is possible to obtain an equation for the expansion scalar by incorporating the epoch dependence of elementary particle masses. The epoch dependence of particle masses for the Robertson-Walker (RW) universe appears as a consequence of hadronic matter extension in a microlocal space-time regarded as anisotropic and Finslerian. The governing equations in the present formalism specify the equation of state and give a solution for the expansion scalar. This solution represents a mild inflationary phase in the very early universe. It is also shown that there are no 'turn-on' and 'turn-off' problems for this mild inflation. It can account for particle creation and production of the specific entropy per baryon consistent with the observation.

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