Unimodular relativity and cosmological constant : Comments

TL;DR

This paper critically examines claims in unimodular relativity, arguing that previous conclusions about the covariant continuity of stress-energy and the constancy of the cosmological constant are not valid.

Contribution

It challenges prior results by Finkelstein et al., showing that their conclusions about matter conservation and the cosmological constant in unimodular relativity are incorrect.

Findings

Previous claims about covariant continuity law are invalid

The cosmological constant is not necessarily a constant of integration

Revises understanding of unimodular relativity's implications

Abstract

We show that the conclusion that matter stress-energy tensor satisfies the usual covariant continuity law, and the cosmological constant is still a constant of integration arrived at by Finkelstein et al (42, 340, 2001) is not valid.