Cosmological singularities and higher-order gravitational lagrangians

Details Cosmological singularities and higher-order gravitational lagrangians Cosmological singularities and higher-order gravitational lagrangians

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974phlb...52..442g&link_type=abstract

Physics Letters B, Volume 52, Issue 4, p. 442-444.

Physics

10

Scientific paper

General relativity is modified by adding terms proportional to R2 and RμνRμν to the Lagrangian. One class of solutions of the modified field equations is free of singularities but does not lead to asymptotic behaviour (for large time) of the Friedmann type. A second class, which shows the correct asymptotic behaviour, does contain the usual singularities of Friedmann universes, collapse being modulated by small oscillations only. The quantum effects considered here are thus unable to prevent the occurrence of cosmological singularities under physically reasonable conditions.

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