MG15 - Talk detail |
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Participant |
Julié, Félix-Louis | |||||||
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Institution |
APC, Paris - 10 rue Alice Domon et Léonie Duquet - Paris - - France | |||||||
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Session |
BN6 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
"Two-Body Problem In Modified Gravities And EOB Formalism" | |||||
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Abstract |
In general relativity, the effective-one-body (EOB) approach, which consists in reducing the two-body dynamics to the motion of a test particle in an effective static, spherically symmetric metric, has proven to be a very powerful framework to describe analytically the coalescence of compact binary systems. In this talk, we address its extension to modified gravities, considering first the example of massless scalar-tensor theories (ST). We reduce the ST two-body dynamics, which is known at second post-Keplerian order, to a simple parametrized deformation of the general relativistic EOB Hamiltonian, and estimate the ST corrections to the strong-field regime. We then discuss the class of Einstein-Maxwell-dilaton (EMD) theories, which provide simple examples of "hairy" black holes. By computing the EMD post-Keplerian two-body Lagrangian, we show that it can, as well, be incorporated within the EOB framework. Finally, we highlight that, depending on their scalar environment, EMD black holes can transition to a regime where they strongly couple to the scalar and vector fields, inducing large deviations from the general relativistic two-body dynamics. |
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Pdf file |
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