Frattulillo, Domenico (2024) Quantum gravity theory and gamma ray astrophysics. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Quantum gravity theory and gamma ray astrophysics |
| Autori: | Autore Email Frattulillo, Domenico domenico.frattulillo@unina.it |
| Data: | 9 Marzo 2024 |
| Numero di pagine: | 150 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Fisica |
| Dottorato: | Fisica |
| Ciclo di dottorato: | 36 |
| Coordinatore del Corso di dottorato: | nome email Canale, Vincenzo vincenzo.canale@unina.it |
| Tutor: | nome email Amelino-Camelia, Giovanni [non definito] Mercati, Flavio [non definito] |
| Data: | 9 Marzo 2024 |
| Numero di pagine: | 150 |
| Parole chiave: | quantum qravity; quantum gravity phenomenology; quantum groups; in-vacuo dispersion; doubly special relativity; gamma ray bursts |
| Settori scientifico-disciplinari del MIUR: | Area 02 - Scienze fisiche > FIS/02 - Fisica teorica, modelli e metodi matematici |
| Depositato il: | 19 Mar 2024 10:34 |
| Ultima modifica: | 12 Ago 2026 05:33 |
| URI: | https://www.fedoa.unina.it/id/eprint/15508 |
Abstract
In this thesis I dealt with both theoretical and phenomenological aspects of quantum gravity. In the first part of this dissertation we investigate some conceptual aspects that emerge when we consider quantum spacetimes whose relativistic symmetries are deformed at Planck-scale. In particular, we first study the properties of Noether charges in quantum spacetimes focusing on first-quantized particles described within a Hamiltonian framework, finding that their definition is strictly related to the form of the interaction potential. Then, we explore how deformations of symmetries can affect the role of observers and the properties of reference frames by focusing on a quantum group toy model. In particular, we deal with a simplified model in which two observers are just interested in the relative orientation among their frames assuming that the rotational invariance of spacetime is described by the quantum group SUq(2). Within this framework, we show the quantizazion of one of the Euler angles and a novel paradigm of agency-dependence of spacetime emerges, namely the properties of spacetime points depend on some choices made by the observer. In the second part of this thesis, we present an in-depth study of in-vacuo dispersion in quantum spacetimes that is the most active area of quantum-gravity phenomenology. It is indeed well understood that cosmological distances are huge amplifier for the tiny Planck-scale effects, such that they can be within the reach of our current sensitivity. We present the most general formula for the time of flight of particle in DSR-deformed expanding spacetimes of FLRW type, that admits just three possible forms of redshift dependence and we discuss some noteworthy special scenarios. Finally, we conclude this dissertation with a novel analysis of in-vacuo dispersion through gamma ray bursts, also including data coming from the recently observed GRB221009A, obtaining intriguing indications on the possibility of having a non-monotonic dependence of the time delay on the redshift distance of the source.
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