Curvature-squared cosmology in the first-order formalism

Details Curvature-squared cosmology in the first-order formalism Curvature-squared cosmology in the first-order formalism

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jmp....31.2429s&link_type=abstract

Journal of Mathematical Physics (ISSN 0022-2488), vol. 31, Oct. 1990, p. 2429-2433. Research supported by U.S. National Research

Physics

9

Cosmology, Gravitational Effects, Quantum Theory, Relativity, String Theory, Einstein Equations, Field Theory (Physics)

Scientific paper

Variation of the R + alpha-R-squared action with respect to independent metric and connection fields is shown to be equivalent to the metric-compatible fourth-order gravity coupled to a vector defined as a function of the trace of the energy-momentum tensor. The field equations are second order. The Friedmann cosmology based on this model is studied and it is shown to include nonsingular solutions at t = 0.

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