Unimodular Gravity Redux
E. \'Alvarez, S. Gonz\'alez-Mart\'in, M. Herrero-Valea, C. P., Mart\'in
TL;DR
This paper explores how Unimodular Gravity alters the treatment of the cosmological constant, demonstrating that quantum corrections do not change its classical value, thus providing new insights into its theoretical stability.
Contribution
It shows that in Unimodular Gravity, the classical value of the cosmological constant remains unrenormalized by quantum corrections, offering a novel perspective on its stability.
Findings
Quantum corrections do not renormalize the classical cosmological constant.
Unimodular Gravity decouples the cosmological constant from vacuum energy.
The classical value of the cosmological constant remains stable under quantum effects.
Abstract
It is well known that the problem of the cosmological constant appears in a new light in Unimodular Gravity. In particular, the zero momentum piece of the potential does not automatically produce a corresponding cosmological constant. Here we show that quantum corrections do not renormalize the classical value of this observable.
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