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DTSTART;TZID=America/New_York:20220114T093000
DTEND;TZID=America/New_York:20220114T103000
DTSTAMP:20260626T000712
CREATED:20240214T090947Z
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SUMMARY:Light strings\, strong coupling\, and the Swampland
DESCRIPTION:Member Seminar \nSpeaker: Max Wiesner\n\nTitle: Light strings\, strong coupling\, and the Swampland \nAbstract: In this talk\, I will start by reviewing central ideas of the so-called Swampland Program. The Swampland Program aims to identify criteria that distinguish low-energy effective field theories\, that can be consistently coupled to quantum gravity\, from those theories that become inconsistent in the presence of quantum gravity. \nIn my talk I will specialize to four-dimensional effective field theories with N=2 and N=1 supersymmetry. In weakly-coupled regions of the scalar field space of such theories\, it has been shown that light strings are crucial to realize certain Swampland criteria. Complementary to that\, the focus of this talk will be on the role of such light strings away from these weak-coupling regimes. In this context\, I will first discuss a relation between light perturbative strings and strong coupling singularities in the Kähler moduli space of 4d N=1 compactifications of F-theory. More precisely\, in regions of moduli space\, in which a critical string classically becomes light\, I will show that non-perturbative corrections yield to strong coupling singularities for D7-brane gauge theories which obstruct weak-coupling limits. Moreover\, I will demonstrate that in the vicinity of this strong coupling singularity\, the critical\, light string in fact leaves the spectrum of BPS strings thereby providing an explanation for the obstruction of the weak coupling limit. \nI will then move on and discuss the backreaction of perturbative strings in 4d EFTs. Away from the string core\, the backreaction of such strings necessarily leads to strong coupling regions where naively the energy stored in the backreaction diverges. I will show how the introduction of additional non-critical strings can regulate this backreaction and how this can be used to study the spectrum of BPS strings and their tensions even beyond weak coupling regions. In this context\, I will demonstrate how the requirement\, that the total string tension should not exceed the Planck scale\, constrains the possible BPS string charges.
URL:https://cmsa.fas.harvard.edu/event/1-14-2022-member-seminar/
LOCATION:MA
CATEGORIES:Member Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220121T093000
DTEND;TZID=America/New_York:20220121T103000
DTSTAMP:20260626T000712
CREATED:20240214T090725Z
LAST-MODIFIED:20240301T112306Z
UID:10002607-1642757400-1642761000@cmsa.fas.harvard.edu
SUMMARY:AdS with Scale Separation
DESCRIPTION:Member Seminar \nSpeaker: Daniel Junghans\n\nTitle: AdS with Scale Separation \nAbstract: I will talk about Anti-de Sitter solutions in string theory with a parametric separation between the AdS curvature scale and the Kaluza-Klein scale. In particular\, I will discuss recent progress on computing backreaction corrections in such solutions\, and I will explain how to construct solutions without Romans mass that can be lifted to M-theory.
URL:https://cmsa.fas.harvard.edu/event/1-21-2022-member-seminar/
LOCATION:MA
CATEGORIES:Member Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220128T093000
DTEND;TZID=America/New_York:20220128T103000
DTSTAMP:20260626T000712
CREATED:20240214T090436Z
LAST-MODIFIED:20240301T112154Z
UID:10002605-1643362200-1643365800@cmsa.fas.harvard.edu
SUMMARY:Singular Calabi-Yau mirror symmetry
DESCRIPTION:Speaker: Bong Lian \nTitle: Singular Calabi-Yau mirror symmetry \nAbstract: We will consider a class of Calabi-Yau varieties given by cyclic branched covers of a fixed semi Fano manifold. The first prototype example goes back to Euler\, Gauss and Legendre\, who considered 2-fold covers of P1 branched over 4 points. Two-fold covers of P2 branched over 6 lines have been studied more recently by many authors\, including Matsumoto\, Sasaki\, Yoshida and others\, mainly from the viewpoint of their moduli spaces and their comparisons.  I will outline a higher dimensional generalization from the viewpoint of mirror symmetry. We will introduce a new compactification of the moduli space cyclic covers\, using the idea of ‘abelian gauge fixing’ and ‘fractional complete intersections’. This produces a moduli problem that is amenable to tools in toric geometry\, particularly those that we have developed jointly in the mid-90’s with S. Hosono and S.-T. Yau in our study of toric Calabi-Yau complete intersections. In dimension 2\, this construction gives rise to new and interesting identities of modular forms and mirror maps associated to certain K3 surfaces. We also present an essentially complete mirror theory in dimension 3\, and discuss generalization to higher dimensions. The lecture is based on joint work with Shinobu Hosono\, Tsung-Ju Lee\, Hiromichi Takagi\, Shing-Tung Yau.
URL:https://cmsa.fas.harvard.edu/event/1-28-2022-member-seminar/
LOCATION:MA
CATEGORIES:Member Seminar
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