Effective gravity formulation that avoids singularities in quantum FRW cosmologies

Details Effective gravity formulation that avoids singularities in quantum FRW cosmologies Effective gravity formulation that avoids singularities in quantum FRW cosmologies

2009-01-19

arxiv.org/abs/0901.2861v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, no figures

Scientific paper

Assuming that time exists, a new, effective formulation of gravity is introduced, which lies in between the Wheeler-DeWitt approach and ordinary QFT. Remarkably, the Penrose-Hawking singularity of usual Friedman-Robertson-Walker cosmologies is naturally avoided there. The theory is made explicit via specific examples, and compared with loop quantum cosmology. It is argued that it is the regularization of the classical Hamiltonian performed in this last theory what avoid the singularity, rather than quantum effects as in our case.

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