Gravitational “seesaw” and light bending in higher-derivative gravity

Antonio Accioly (), Breno L. Giacchini () and Ilya L. Shapiro ()
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Antonio Accioly: Centro Brasileiro de Pesquisas Físicas
Breno L. Giacchini: Universidade Federal de Juiz de Fora, Departamento de Física, ICE
Ilya L. Shapiro: Tomsk State Pedagogical University and Tomsk State University

A chapter in Physical and Mathematical Aspects of Symmetries, 2017, pp 183-188 from Springer

Abstract: Abstract Local gravitational theories with more than four derivatives have remarkable quantum properties, e.g., they are super-renormalizable and may be unitary in the Lee-Wick sense. Therefore, it is important to explore also the IR limit of these theories and identify observable signatures of the higher derivatives. In the present work we study the scattering of a photon by a classical external gravitational field in the sixth-derivative model whose propagator contains only real, simple poles. Also, we discuss the possibility of a gravitational seesaw-like mechanism, which could allow the makeup of a relatively small physical mass from the huge massive parameters of the action. If possible, this mechanism would be a way out of the Planck suppression, affecting the gravitational deflection of low energy photons. It turnsout that the mechanism which actually occurs works only to shift heavier masses to the further UV region. This fact may be favourable for protecting the theory from instabilities, but makes experimental detection of higher derivatives more difficult.

Date: 2017
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DOI: 10.1007/978-3-319-69164-0_27

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