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DTSTART;TZID=Europe/Madrid:20250916T100000
DTEND;TZID=Europe/Madrid:20250916T113000
DTSTAMP:20260405T102907
CREATED:20250915T093849Z
LAST-MODIFIED:20251218T084800Z
UID:22585-1758016800-1758022200@www.ift.uam-csic.es
SUMMARY:Aspects of symmetries throughout the String Theory Moduli Space
DESCRIPTION:Speaker: Roberta Angius\n\n\nInstitution: IFT UAM/CSIC\n\n\nLocation&Place: Red Room\n\n\nAbstract:\n\n\nThis thesis aims to explore various corners of the string theory moduli spaces using symmetries as a guiding principle to uncover properties of the corresponding theories and their implications for spacetime dynamics.\n\n Within the Swampland Program\, the absence of global symmetries in consistent quantum gravity theories is a key principle\, reformulated in string theory as the Cobordism Conjecture: any consistent configuration must admit spacetime boundaries\, often realized by stringy defects that trivialize cobordism charges. The first part of this thesis implements this idea in effective field theory throughDynamical Cobordism solutions\, where codimension-1 end-of-the-world (ETW) branes appear as finite-distance singularities with scalars diverging to infinite field space. These provide a framework to probe infinite-distance limits in the moduli/field space and Swampland constraints. We construct explicit examples with one or multiple scalars\, including networks of intersecting ETW branes\, and apply them to study infinite-distance singularities in Calabi–Yau fourfold moduli spaces\, described via asymptotic Hodgetheory.\n\nOn the other hand\, we turn to a microscopic approach to string theory and investigate worldsheet generalized symmetries\, defined by topological operators with possibly non-invertible fusion rules. In particular\, we analyze the category of topological defects commuting with spectral flow and N=(4\,4) superconformal symmetry in K3 sigma models. Bystudying their fusion with boundary states\, we argue that while certain models admit infinitely many\, or even continuous families of defects\, at generic points in the K3 moduli space the category is actually trivial.\n\nSupervisor: Ángel Uranga
URL:https://www.ift.uam-csic.es/event/aspects-of-symmetries-throughout-the-string-theory-moduli-space/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Scientific activities,Training
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DTSTART;TZID=Europe/Madrid:20250916T120000
DTEND;TZID=Europe/Madrid:20250916T133000
DTSTAMP:20260405T102907
CREATED:20250915T094023Z
LAST-MODIFIED:20251218T084759Z
UID:22587-1758024000-1758029400@www.ift.uam-csic.es
SUMMARY:Dynamical Cobordism in String Theory and Holography
DESCRIPTION:Speaker:  Jesús Huertas Castellanos\n\n\nInstitution: IFT UAM/CSIC\n\n\nLocation&Place: Red Room\n\n\nAbstract:\n\n\nThis thesis investigates the intricate relationship between topology\, gravity\, and quantum field theory within String Theory\, centering on the Cobordism Conjecture\, which asserts that any consistent quantum gravity theory must allow spacetime boundaries. It begins by introducing Dynamical Cobordism through models that realize end-of-the-world branes dynamically\, linking them to Swampland constraints. It then explores Bubbles of Nothing as non-perturbative instabilities\, classifying them and analyzing their behavior across various theories. The third section applies Dynamical Cobordism to AdS/CFT\, reinterpreting known duals in type IIB string theory as boundary-terminating geometries. Finally\, it examines topological couplings and anomalies in holographic setups\, introducing the SymTFT framework and uncovering new anomaly inflow mechanisms and Chern-Simons structures. \nSupervisor: Ángel Uranga
URL:https://www.ift.uam-csic.es/event/dynamical-cobordism-in-string-theory-and-holography/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Scientific activities,Training
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