Covariant BRST quantization of unimodular gravity. II. Formulation with a vector antighost

Taichiro Kugo, Ryuichi Nakayama, Nobuyoshi Ohta

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In our previous paper, we have presented a covariant BRST quantization of unimodular gravity which may account for the smallness of the cosmological constant, and we have shown that the physical degrees of freedom in the theory are the same as general relativity. The formulation has been given by using rank-2 antisymmetric tensor fields for both ghosts and antighosts. Here we give an alternative formulation using a vector field for the antighost but keeping the same structure for the ghosts. This gives a significantly simpler covariant quantization with less ghosts and no tripole modes in the ghost sector. We show that this also gives only two physical transverse modes as in general relativity.

Original languageEnglish
Article number106006
JournalPhysical Review D
Volume105
Issue number10
DOIs
StatePublished - 15 May 2022

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