Unitarity of Weyl-invariant new massive gravity and generation of graviton mass via symmetry breaking

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2012-03-06

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Tanhayi, M. Reza
Dengiz, Suat
Tekin, Bayram

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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.

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https://hdl.handle.net/11511/43372

Journal

PHYSICAL REVIEW D

DOI

https://doi.org/10.1103/physrevd.85.064008

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Department of Physics, Article

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Citation Formats

M. R. Tanhayi, S. Dengiz, and B. Tekin, “Unitarity of Weyl-invariant new massive gravity and generation of graviton mass via symmetry breaking,” PHYSICAL REVIEW D, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43372.