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* |
| Creators: | Creators Email D'Addio, Anna anna.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: | nome email Capozziello, Salvatore salvatore.capozziello@unina.it |
| Tutor: | nome email De Laurentis, Mariafelicia UNSPECIFIED |
| 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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