Cosmological solutions in generalized hybrid metric-Palatini gravity

JL Rosa, S Carloni, JPS Lemos, FSN Lobo - Physical Review D, 2017 - APS
Physical Review D, 2017APS
We construct exact solutions representing a Friedmann-Lemaître-Robsertson-Walker
(FLRW) universe in a generalized hybrid metric-Palatini theory. By writing the gravitational
action in a scalar-tensor representation, the new solutions are obtained by either making an
ansatz on the scale factor or on the effective potential. Among other relevant results, we
show that it is possible to obtain exponentially expanding solutions for flat universes even
when the cosmology is not purely vacuum. We then derive the classes of actions for the …
We construct exact solutions representing a Friedmann-Lemaître-Robsertson-Walker (FLRW) universe in a generalized hybrid metric-Palatini theory. By writing the gravitational action in a scalar-tensor representation, the new solutions are obtained by either making an ansatz on the scale factor or on the effective potential. Among other relevant results, we show that it is possible to obtain exponentially expanding solutions for flat universes even when the cosmology is not purely vacuum. We then derive the classes of actions for the original theory which generate these solutions.
American Physical Society
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