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Searching for Light Scalar Dark Matter with Gravitational Waves Detectors

Abstract : The existence of the dark matter and the truth beyond its nature has been one of the greatest puzzle of the twentieth century and still it is nowadays. In the last decades several hypothesis, such as the WIMPs model, have been proposed to solve such puzzle but none of them has been able so far to succeed. In this thesis work we will focus on an other very appealing model in which dark matter is successfully described by an ultra-light scalar field whose origin can be sought in the low-energy limit of one of the most promising unification theories: the String Theory. In this work we show how such scalar field, if present, interacts with standard matter and in particular with the optical apparatus that is at the core of gravitational waves antennas. We derive and discuss the signal produced by this interaction through different approaches deriving both approximated and exact solutions. Special attention is paid to the second-order term of the signal approximate series expansion whose contribution ends up to be not negligible when one factors in the specific geometrical dimensions and frequency range of gravitational waves detectors like Advanced LIGO and Advanced Virgo. As suggested by recent surveys, we assume the presence of a dark matter stream in the local neighborhood of the solar system and show its effect on the signal. We then propose and discuss a hierarchical statistical analysis aimed to the signal detection. In case of no detection a limit curve for the coupling parameter d*g is derived. Such curve is then analyzed in detail showing the magnitude of the contribution of the first-order and second-order terms of the signal series expansion. We analyze the modification of the constraint curve due to the variation of the fraction of local dark matter belonging to the stream. We show finally how the constraint curve responds to variations of the search parameter and discuss the optimal choices.
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https://tel.archives-ouvertes.fr/tel-03180567
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Submitted on : Thursday, March 25, 2021 - 10:28:52 AM
Last modification on : Saturday, March 27, 2021 - 3:32:14 AM
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Francesco Cipriano. Searching for Light Scalar Dark Matter with Gravitational Waves Detectors. Instrumentation and Methods for Astrophysic [astro-ph.IM]. Université Côte d'Azur, 2020. English. ⟨tel-03180567⟩

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