Massive Unimodular Gravity
Enrique Alvarez, Jesus Anero, Guillermo Milans del Bosch, Raquel, Santos-Garcia
TL;DR
This paper introduces a ghost-free massive deformation of unimodular gravity that circumvents previous no-go theorems by sacrificing Lorentz invariance, with the mimetic degree of freedom vanishing on-shell.
Contribution
It presents a novel massive deformation of unimodular gravity that avoids no-go theorems by abandoning Lorentz invariance, expanding the landscape of consistent gravity theories.
Findings
A ghost-free massive unimodular gravity model is constructed.
The model avoids the no-go theorem for Fierz-Pauli mass terms in UG.
The mimetic degree of freedom vanishes on-shell in this framework.
Abstract
A ghost free massive deformation of unimodular gravity (UG), in the spirit of {\em mimetic massive gravity}, is shown to exist. This construction avoids the no-go theorem for a Fierz-Pauli type of mass term in UG by giving up on Lorentz invariance. In our framework, the mimetic degree of freedom vanishes on-shell.
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