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arXiv · 2611.08952

Equatorial Periodic Orbits and Gravitational Wave Signatures in Weyl Geometric Gravity Black Holes

Dhruba Jyoti Gogoi·Himanshu Chaudhary·Tiberiu Harko
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Abstract

Weyl geometric gravity theory is a gravitational theory with Lagrangian density constructed from the square of the Weyl curvature scalar and the strength of the Weyl vector. The theory can be reformulated as a scalar - vector - tensor theory in the Riemann geometry by introducing an auxiliary scalar field, in the presence of a non - minimal coupling between the Ricci scalar and the scalar field. Assuming that the Weyl vector has only a radial component, an exact spherically symmetric black hole type solution of the field equations in the vacuum can be obtained. The solution depends on three arbitrary integration constants. As compared to the case of the Schwarzschild black hole, the Weyl geometric gravity black hole solution contains two new terms, linear and quadratic, in the radial coordinate. It is the main goal of the present work to investigate astrophysical properties of the Weyl geometric black holes by considering the behavior of the timelike geodesics, which allows to explore how the geometric nonmetricity influences the strong-field dynamics of massive test particles as well as the topological structure of the periodic orbits. The resulting gravitational wave emission in extreme mass-ratio inspiral (EMRI) systems is also considered. Our results show that the presence of nonmetricity in Weyl geometric gravity leaves distinct and measurable signatures on both the orbital topology and the emitted gravitational waveforms of compact EMRI systems. These unique temporal and amplitude modulations provide a promising observational avenue for testing the presence of nonmetricity on cosmic scales.

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Dhruba Jyoti Gogoi, Himanshu Chaudhary, Tiberiu Harko. 2026-11-06. Equatorial Periodic Orbits and Gravitational Wave Signatures in Weyl Geometric Gravity Black Holes. https://arxiv.org/abs/2611.08952

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