Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt.......120m&link_type=abstract
Thesis (PH.D.)--CALIFORNIA INSTITUTE OF TECHNOLOGY, 1987.Source: Dissertation Abstracts International, Volume: 48-06, Section: B
Physics
Scientific paper
The subject of this thesis is the description of the Very Early Universe, from the Big Bang to the beginning of the radiation dominated Friedmann- Robertson-Walker era. We examine a pure gravity inflationary model for the Universe which is based on adding an varepsilon R^2 term to the usual gravitational lagrangian ("improved Starobinsky model"). We find the classical inflationary solution essentially independent of initial conditions. The model has only one free parameter which is bounded from above by observational constraints on scalar and tensorial perturbations and from below by both the need for standard baryogenesis and the need for galaxy formation. This requires 10^{11}GeV < varepsilon^{-1/2} < 10^ {13}GeV. The model is interpreted as a Chaotic Inflationary model, with initial conditions for classical evolution being generated by the quantum fluctuations in metric and curvature in Very Early Universe. We discuss those fluctuations using particular solution of Wheeler-De Witt equation and find that the inflationary phase is highly typical event.
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