期刊
NUCLEAR PHYSICS B
卷 936, 期 -, 页码 364-382出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysb.2018.09.009
关键词
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We study various properties of a Proca field coupled to gravity through minimal and quadrupole interactions, described by a two-parameter family of Lagrangians. Stfickelberg decomposition of the effective theory spells out its model-dependent ultraviolet cutoff, parametrically larger than the Proca mass. We present pp-wave solutions that the model admits, consider linear fluctuations on such backgrounds, and thereby constrain the parameter space of the theory by requiring null-energy condition and the absence of negative time delays in high-energy scattering. We briefly discuss the positivity constraints-derived from unitarity and analyticity of scattering amplitudes-that become ineffective in this regard. (C) 2018 The Author(s). Published by Elsevier B.V.
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