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arXiv · 2312.14913

Compton Amplitude for Rotating Black Hole from QFT

Lucile Cangemi·Marco Chiodaroli·Henrik Johansson·Alexander Ochirov·Paolo Pichini·Evgeny Skvortsov
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Abstract

We construct a candidate tree-level gravitational Compton amplitude for a rotating Kerr black hole, for any quantum spin s=0,1/2,1,...,$\infty$, from which we extract the corresponding classical amplitude to all orders in the spin vector $S^\mu$. We use multiple insights from massive higher-spin quantum field theory, such as massive gauge invariance and improved behavior in the massless limit. A chiral-field approach is particularly helpful in ensuring correct degrees of freedom, and for writing down compact off-shell interactions for general spin. The simplicity of the interactions is echoed in the structure of the spin-s Compton amplitude, for which we use homogeneous symmetric polynomials of the spin variables. Where possible, we compare to the general-relativity results in the literature, available up to eighth order in spin.

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Lucile Cangemi, Marco Chiodaroli, Henrik Johansson, Alexander Ochirov, Paolo Pichini, Evgeny Skvortsov. 2023-12-22. Compton Amplitude for Rotating Black Hole from QFT. https://arxiv.org/abs/2312.14913

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