Extra gauge symmetries in BHT gravity

Details Extra gauge symmetries in BHT gravity Extra gauge symmetries in BHT gravity

2011-03-11

arxiv.org/abs/1103.2388v2

JHEP 1103:139,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LATEX, 12 pages

Scientific paper

10.1007/JHEP03(2011)139

We study the canonical structure of the Bergshoeff-Hohm-Townsend massive gravity, linearized around a maximally symmetric background. At the critical point in the space of parameters, defined by $\Lambda_0/m^2=-1$, we discover an extra gauge symmetry, which reflects the existence of the partially massless mode. The number of the Lagrangian degrees of freedom is found to be 1. We show that the canonical structure of the theory at the critical point is unstable under linearization.

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