Appearance of Boulware-Deser ghost in bigravity with doubly coupled matter
High Energy Physics - Theory
2015-06-22 v2 General Relativity and Quantum Cosmology
Abstract
We discuss the ghost freeness in the case when we add matter coupled to two metrics to the ghost-free bigravity. In this paper we show that the Boulware-Deser ghost generally revives in the presence of doubly coupled matter and that ghost freeness strongly restricts the model of kinetically doubly coupled matter. This result may anticipate difficulties in the attempt to derive the ghost-free bigravity as a low-energy effective theory, starting with a model applicable at high energies.
Keywords
Cite
@article{arxiv.1408.0487,
title = {Appearance of Boulware-Deser ghost in bigravity with doubly coupled matter},
author = {Yasuho Yamashita and Antonio De Felice and Takahiro Tanaka},
journal= {arXiv preprint arXiv:1408.0487},
year = {2015}
}
Comments
15 pages