A physical characterization of the adiabatic vacuum in Robertson-Walker universe

Details A physical characterization of the adiabatic vacuum in Robertson-Walker universe A physical characterization of the adiabatic vacuum in Robertson-Walker universe

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gregr..18..193c&link_type=abstract

General Relativity and Gravitation (ISSN 0001-7701), vol. 18, Feb. 1986, p. 193-205.

Physics

1

Adiabatic Conditions, Cosmology, Universe, Vacuum, Expansion, Field Theory (Physics), Klein-Gordon Equation, Oscillations, Scalars

Scientific paper

As the red shift shows no sign of oscillatory behavior in an expanding universe, it is postulated that the energy Omegak of a scalar field does not oscillate in such a universe. In the massive case, expanding the differential equation for Omegak in mass powers, it is found that the nonoscillatory solution coincides with the adiabatic solution up to the m exp 6 order. It is also demonstrated that this solution is unique for all the evolution of the universe with cosmological interest. Using the nonoscillatory solution as the one that defines the good vacuum state, the particle and energy creation are computed for a simple model of expanding universe. Both quantities turn out to be finite.

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