Unimodular quantum gravity and the cosmological constant
General Relativity and Quantum Cosmology
2018-08-01 v1
Abstract
It is shown that the one-loop effective action of unimodular gravity is the same as that of ordinary gravity, restricted to unimodular metrics. The only difference is in the treatment of the global scale degree of freedom and of the cosmological term. A constant vacuum energy does not gravitate, addressing one aspect of the cosmological constant problem.
Cite
@article{arxiv.1712.09903,
title = {Unimodular quantum gravity and the cosmological constant},
author = {R. Percacci},
journal= {arXiv preprint arXiv:1712.09903},
year = {2018}
}
Comments
Prepared for the proceedings of the workshop "Black holes, gravitational waves and spacetime singularities", held at the Vatican Observatory, Castel Gandolfo (Rome) May 9 - 12, 2017