Can one tell Einstein's unimodular theory from Einstein's general relativity?
arXiv:hep-th/0501146 · doi:10.1088/1126-6708/2005/03/002
Abstract
The so called unimodular theory of gravitation is compared with general relativity in the quadratic (Fierz-Pauli) regime, using a quite broad framework, and it is argued that quantum effects allow in principle to discriminate between both theories.
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