Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-12-11
Physics
High Energy Physics
High Energy Physics - Theory
11 pages, Einstein-frame version of the Weyl-invariant quadratic gravity added in Appendix B. To appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.85.064008
We give a detailed analysis of the particle spectrum and the perturbative unitarity of the recently introduced Weyl-invariant version of the new massive gravity in 2+1 dimensions. By computing the action up to second order in the fluctuations of the metric, the gauge and the scalar fields around the anti-de Sitter (AdS) and flat vacua, we find that the theory describes unitary (tachyon and ghost-free) massive spin-2, massive (or massless) spin-1 and massless spin-0 excitations for certain ranges of the dimensionless parameters. The theory is not unitary in de Sitter space. Scale invariance is either broken spontaneously (in AdS background) or radiatively (in flat background) and hence the masses of the particles are generated either spontaneously or at the second loop order.
Dengiz Suat
Tanhayi Mohammad Reza
Tekin Bayram
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