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DTSTART;TZID=America/New_York:20221107T110000
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DTSTAMP:20240228T112123Z
CREATED:20230730T183933Z
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UID:10001154-1667818800-1667822400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:EFT strings and emergence
DESCRIPTION:Swampland Seminar \nSpeaker: Fernando Marchesano (IFT Madrid) \nTitle: EFT strings and emergence \nAbstract: We revisit the Emergence Proposal in 4d N=2 vector multiplet sectors that arise from  type II string Calabi-Yau compactifications\, with emphasis on the role of axionic fundamental strings\, or EFT strings. We focus on large-volume type IIA compactifications\, where EFT strings arise from NS5-branes wrapping internal four-cycles\, and consider a set of infinite-distance moduli-space limits that can be classified in terms of a scaling weight w=1\,2\,3. It has been shown before how one-loop threshold effects of an infinite tower of BPS particles made up of D2/D0-branes generate the asymptotic behaviour of  the gauge kinetic functions along limits with $w=3$. We extend this result to w=2 limits\, by taking into account D2-brane multi-wrapping numbers. In w=1 limits the leading tower involves EFT string oscillations\, and one can reproduce the behaviour of both weakly and strongly-coupled U(1)’s independently on whether the EFT string is critical or not\, by assuming that charged modes dominate the light spectrum.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/swampland_102422-2/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Swampland Seminar
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DTSTART;TZID=America/New_York:20221115T110000
DTEND;TZID=America/New_York:20221115T120000
DTSTAMP:20240228T111805Z
CREATED:20230730T184327Z
LAST-MODIFIED:20240228T111805Z
UID:10001155-1668510000-1668513600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:The Emergence Proposal in Quantum Gravity and the Species Scale
DESCRIPTION:Swampland Seminar \nSpeaker: Alvaro Herraez (Saclay) \nTitle: The Emergence Proposal in Quantum Gravity and the Species Scale \nAbstract: The Emergence Proposal claims that in Quantum Gravity the kinetic terms of the fields in the IR emerge from integrating out (infinite) towers of particles up to the QG cutoff. After introducing this proposal in the context of the Swampland Program\, I will explain why it is natural to identify this QG cutoff with the Species Scale\, motivating it by direct computation in the presence of the relevant towers. Then\, I will present evidence for this proposal by directly studying how it is realized in different string theory setups\, where the kinetic terms of scalars\, p-forms and even scalar potentials can be shown to emerge after integrating out such towers. \n  \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/swampland_111522/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Swampland Seminar
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-Swampland-Seminar-11.15.22.png
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