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Rotating black holes in the cubic Galileon theory

Abstract : The present project falls within the wide effort conducted to study theories of gravitation, notably by modelling the physics of compact objects like black holes. The long-term objective of this approach is to determine all theories that are either incompatible with observations, or theoretically inconsistent. The first part of the manuscript thus presents the essential concepts and principles that are common to all these theories, and introduces some of these theories which connect to the project. In the second part, the actual contribution of the project is exposed: comparing rotating black holes of the cubic Galileon theory with the Kerr family of the general theory of relativity. The latter was developed by Albert Einstein more than a century ago, while the cubic Galileon is a much more recent theory.First, the rotating black holes are constructed numerically. Then, the properties of the orbits around them are investigated, in particular their stability. Finally, the images of a simple model of accretion disk orbiting the black holes are simulated. Such orbits and images directly relate the observations realized by instruments like GRAVITY or the Event Horizon Telescope, which monitor supermassive black holes. The present project thus allows to identify possible tensions between the predictions of the cubic Galileon theory and observational data on black holes.
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https://tel.archives-ouvertes.fr/tel-03197687
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Submitted on : Wednesday, April 14, 2021 - 9:52:08 AM
Last modification on : Wednesday, October 27, 2021 - 7:19:25 AM
Long-term archiving on: : Thursday, July 15, 2021 - 6:10:44 PM

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  • HAL Id : tel-03197687, version 1

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Karim van Aelst. Rotating black holes in the cubic Galileon theory. Physics [physics]. Université de Paris, 2020. English. ⟨NNT : 2020UNIP7043⟩. ⟨tel-03197687⟩

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