Valeixo Bento, Bruno 
ORCID: 0000-0003-4703-5318
(2023)
The Gravity of Warped Throats: de Sitter vacua and Gravitational Waves from Type IIB string theory.
PhD thesis, University of Liverpool.
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Abstract
In this thesis we discuss challenges and opportunities arising from warping the extra dimensions of string theory. After reviewing the required background (including the essentials of Type IIB string theory; flux compactifications; conifolds, warping, and the Klebanov-Strassler and GKP solutions; and the KKLT and LVS proposals) we will discuss de Sitter solutions in warped flux compactifications. We revisit some strongly-warped solutions, present a new solution in a weakly-warped regime and discuss the advantages of weak warping. We then consider the robustness of the new solution in the presence of subleading corrections to the scalar potential. We also explore the difficulties of realising alternative quintessence models as quasi-de Sitter solutions, showing in particular that the generic behaviour of the (single field) scalar potential arising for different types of string theory moduli does not allow for a slow-roll accelerated expansion at the tail of a runaway. We then take the first steps in understanding the effects of warping in gravitational wave signatures of extra dimensions. By considering the tower of Kaluza-Klein spin-2 states arising from a warped compactification of Type IIB string theory, we study the effects of warping on their masses and wavefunction profiles, which we then use to compute corrections to the Newtonian potential that one can compare with current constraints on fifth forces. This allows us to combine theoretical consistency constraints on the parameter space with the range of parameters experimentally excluded, thereby providing a direct connection between string theory quantities and observations. Although a careful study of gravitational wave signals is left for future work, we briefly outline how these results directly apply in that context and suggest which sources might be more promising for future detection.
| Item Type: | Thesis (PhD) |
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| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 20 Sep 2023 10:19 |
| Last Modified: | 20 Sep 2023 10:19 |
| DOI: | 10.17638/03171755 |
| Supervisors: |
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| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3171755 |
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