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arXiv · 2512.04083

Screening of dipolar emission in two-scale Gauss-Bonnet gravity

Farid Thaalba·Leonardo Gualtieri·Thomas P. Sotiriou·Enrico Trincherini
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Abstract

We study black holes in shift-symmetric scalar Gauss-Bonnet gravity extended by a cubic Galileon interaction with a distinct energy scale. Introducing this hierarchy profoundly modifies the theory's phenomenology. The cubic interaction allows for smaller black holes, and can generate a screening mechanism near the horizon, making large Gauss-Bonnet couplings consistent with gravitational-wave bounds. Observable quantities such as the scalar charge, the innermost stable circular orbit, and its frequency are most affected for small black holes. The resulting multi-scale effective field theory remains technically natural and offers new avenues to probe gravity in the strong-field regime.

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Farid Thaalba, Leonardo Gualtieri, Thomas P. Sotiriou, Enrico Trincherini. 2025-12-03. Screening of dipolar emission in two-scale Gauss-Bonnet gravity. https://arxiv.org/abs/2512.04083

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