D'Addio, Anna (2022) Testing gravity around Sgr A*. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Resource language: English
Title: Testing gravity around Sgr A*
D'Addio, Annaanna.daddio@unina.it
Date: 4 March 2022
Number of Pages: 168
Institution: Università degli Studi di Napoli Federico II
Department: Fisica
Dottorato: Fisica
Ciclo di dottorato: 34
Coordinatore del Corso di dottorato:
Capozziello, Salvatoresalvatore.capozziello@unina.it
De Laurentis, MariafeliciaUNSPECIFIED
Date: 4 March 2022
Number of Pages: 168
Keywords: Theories of gravity; General Relativity; Yukawa-like pitential; S-Stars; Sgr A*; Galactic Center
Settori scientifico-disciplinari del MIUR: Area 02 - Scienze fisiche > FIS/05 - Astronomia e astrofisica
Date Deposited: 16 Mar 2022 15:35
Last Modified: 28 Feb 2024 14:16
URI: http://www.fedoa.unina.it/id/eprint/14580

Collection description

Although General Relativity has proved valid at the Solar System scale, shortcomings came out undermining its validity at ultraviolet and infrared regimes. In the first part of this thesis, we focus on two Extended Theories of Gravity that could help to solve the flaws of General Relativity: the f(R)-gravity theory, which arises as an alternative to models based on dark matter and dark energy, and the Bootstrapped Newtonian gravity theory, born from the attempt to frame gravitational theory in a quantum context. In the second part of the thesis, we present a general method through which astronomical constraints to the aforementioned theories can be given, and that can be useful to classify other gravitational theories at different scales. In particular, we consider the Galactic Center to probe the theories under consideration by studying the dynamics of S-stars, a cluster of young stars revolving around the compact object Sgr A*. To constrain the free parameters we adopt a fully relativistic approach which consists of solving the geodesic equations instead of just putting the modified gravitational potential in the standard Newton’s law. Then, we reported a phenomenological investigation aiming at placing bounds on the free parameters from the observed precession of planets in the Solar System.


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