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arXiv · 1508.03246

Novel nonlinear kinetic terms for gravitons

Wenliang Li
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Abstract

A set of novel derivative terms for spin-2 fields are proposed. They are the wedge products of curvature two-forms and vielbeins. In this work, we investigate the properties of novel two-derivative terms in the context of bi-gravity. Based on a minisuperspace analysis, we identify a large class of bi-gravity models where the Boulware-Deser ghost could be absent. We give a new perspective that Weyl Gravity and New Massive Gravity belong to this class of bi-gravity models involving novel derivative terms. In addition, we discuss the UV cut-off scales, dynamical symmetric conditions and novel higher-derivative terms.

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Wenliang Li. 2015-08-13. Novel nonlinear kinetic terms for gravitons. https://doi.org/10.1103/physrevd.94.064078

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