UV consistency and IR signatures in gravity beyond general relativity: UV-complete cosmological EFTs and light propagation in metric-affine geometry
This thesis addresses the fundamental question of how gravity beyond GR can be made UV-consistent, observationally meaningful, and ultimately both at once. Its core is the study of cosmological EFTs through the asymptotic safety programme using functional RG methods. Taking generalised Proca theorie...
Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Book/Monograph Tesi |
| Lingua: | inglese |
| Pubblicazione: |
Heidelberg
29 Jul. 2026
|
| DOI: | 10.11588/heidok.00039130 |
| Soggetti: | |
| Accesso online: | Resolving-System, kostenfrei: https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-391304 Resolving-System, kostenfrei: https://doi.org/10.11588/heidok.00039130 Verlag, kostenfrei, Volltext: http://www.ub.uni-heidelberg.de/archiv/39130 Langzeitarchivierung Nationalbibliothek, kostenfrei: https://d-nb.info/1414870116/34 
|
| Note sull'autore: | put forward by Carlos Pastor Marcos ; referees: Prof. Dr. Lavinia Heisenberg [und ein weiterer Gutachter] |
| Riassunto: | This thesis addresses the fundamental question of how gravity beyond GR can be made UV-consistent, observationally meaningful, and ultimately both at once. Its core is the study of cosmological EFTs through the asymptotic safety programme using functional RG methods. Taking generalised Proca theories as a concrete vector-tensor framework, it constructs a fluctuation-based truncation, derives the corresponding RG flows, and uncovers a rich fixed-point structure that provides evidence for non-perturbative renormalisability of Proca-type and gauge-like theories, thereby laying the groundwork for future UV studies of cosmological EFTs. It then tackles the complementary question of how UV fixed-point data can feed into inflationary phenomenology. To this end, it develops a model-independent RG-improvement framework for quadratic gravity and shows that different near-fixed-point scaling regimes lead to distinct inflationary potentials and predictions for observables such as the scalar spectral index, the tensor-to-scalar ratio, and the scalar amplitude. In its second part, the thesis turns to metric-affine geometry and asks how non-Riemannian structures can leave observable signatures. Using a symmetry-based construction of electromagnetic models, it shows how torsion and non-metricity can modify, among other effects, light propagation, intensity, and polarisation, opening the door to a rich phenomenology of compact objects, lensing, and potentially cosmology. |
|---|---|
| Descrizione fisica: | Online Resource |
| DOI: | 10.11588/heidok.00039130 |