Unimodular quantum gravity and the cosmological constant (original) (raw)
ADS
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.
Publication:
Foundations of Physics
Pub Date:
October 2018
DOI:
arXiv:
Bibcode:
Keywords:
- Cosmological constant;
- Quantum gravity;
- Unimodular;
- General Relativity and Quantum Cosmology
E-Print:
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