Sarracino, Giuseppe (2023) Cosmological probes and extended gravity and electromagnetism. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Cosmological probes and extended gravity and electromagnetism. |
| Autori: | Autore Email Sarracino, Giuseppe giuseppe.sarracino@unina.it |
| Data: | 6 Marzo 2023 |
| Numero di pagine: | 231 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Fisica |
| Dottorato: | Fisica |
| Ciclo di dottorato: | 35 |
| Coordinatore del Corso di dottorato: | nome email Canale, Vincenzo canale@na.infn.it |
| Tutor: | nome email Capozziello, Salvatore [non definito] Spallicci, Alessandro D. A. M. [non definito] |
| Data: | 6 Marzo 2023 |
| Numero di pagine: | 231 |
| Parole chiave: | Supernovae Type Ia; Gamma-ray Bursts; Modified Electromagnetism; Extended Gravity; Stellar Structure. |
| Settori scientifico-disciplinari del MIUR: | Area 02 - Scienze fisiche > FIS/05 - Astronomia e astrofisica |
| Depositato il: | 15 Mar 2023 11:05 |
| Ultima modifica: | 10 Apr 2025 14:12 |
| URI: | http://www.fedoa.unina.it/id/eprint/15202 |
Abstract
In this thesis, we have performed analysis regarding some frontiers of astrophysics and cosmology, considering both observational data as well as novel models and frameworks. More specifically, we have studied a correlation involving physical parameters of Gamma-Ray Bursts (GRBs), intending to use these features both to classify GRBs into physical classes as well as for employing them as cosmological tools, to infer parameters like the matter content in the Universe today and the Hubble constant. Indeed, for our investigations on GRBs as cosmological tools, we have performed simulations starting from the best-fit GRB fundamental plane parameters, and we have analyzed real GRBs data together with other more conventional cosmological probes, such as Supernovae type Ia (SNe Ia) and Baryon Acoustic Oscillations (BAO), via a Bayesian approach. We then explore possible extensions both of classical electromagnetism as well as of General Relativity. For the former, we study what the contribution of non-standard electromagnetic effects would be on cosmological observations, in particular on their related redshift, using mock data as well as the aforementioned SNe Ia and BAO data sets, in cosmological models where we do not introduce the still mysterious dark energy. We then study the Earth's magnetosphere and the surrounding solar wind region by considering data from the Magnetospheric Multiscale (MMS) Mission, to find possible evidence of non-standard electromagnetism using data related to the measured current densities in these regions. From the gravitational point of view, instead, we study a particular Extended Theory of Gravity (ETG), known as f(R)-Gravity, in the weak, astrophysical, field regime. In particular, we apply it to the stellar structure of non-compact objects, including variable stars.
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