On the quasi-de sitter cosmological model of Starobinsky

Details On the quasi-de sitter cosmological model of Starobinsky On the quasi-de sitter cosmological model of Starobinsky

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..192...59p&link_type=abstract

Physics Letters B, Volume 192, Issue 1-2, p. 59-64.

Physics

10

Scientific paper

A non-singular cosmological model that permits inflation has been constructed by Starobinsky, starting from the theory with lagrangian density L = sqrt(-g)[(mP2/16π)(R-R2/6m2)]. The spectrum of density perturbations is approximately adiabatic, with amplitude δρ/ρ~0-4 on the scale of a galaxy, provide that m<=5×10-6mP. We rederive this constraint via the result of Whitt, who found by conformally transforming the metric that L can be written in the form of gravity interacting with a minimally coupled scalar field. The implications of this result for the problem of initial conditions in the universe are also discussed.

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