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DTSTART;TZID=America/New_York:20240201T103000
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SUMMARY:Algebraic billiards and dynamical degrees
DESCRIPTION:Algebraic Geometry in String Theory Seminar \nSpeaker: Max Weinreich (Harvard) \nTitle: Algebraic billiards and dynamical degrees \nAbstract: Billiards is one of the most-studied dynamical systems\, modeling the behavior of a point particle bouncing around some space. If the space is a plane region bounded by an algebraic curve\, then we may use techniques from algebraic geometry to study its billiards map. We explain how to view billiards as a complex algebraic correspondence\, and we prove upper and lower bounds on the dynamical degree\, the growth rate of the degrees of the iterates\, in terms of the degree of the boundary curve. These degree growth rates are studied in mathematical physics\, broadly speaking\, as a way to identify integrable (exactly solvable) physical models. In our setting\, this theory gives us an upper bound on the entropy\, or chaos\, of billiards in curves.
URL:https://cmsa.fas.harvard.edu/event/agst-2124/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebraic Geometry in String Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Algebraic-Geometry-in-String-Theory-02.01.2024_Page_1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240208T103000
DTEND;TZID=America/New_York:20240208T113000
DTSTAMP:20260423T134005
CREATED:20240129T162946Z
LAST-MODIFIED:20240205T190443Z
UID:10000877-1707388200-1707391800@cmsa.fas.harvard.edu
SUMMARY:On (semi)stable reduction and KSBA moduli in positive characteristic
DESCRIPTION:Algebraic Geometry in String Theory Seminar \nSpeaker: Iacopo Brivio (Harvard CMSA) \nTitle: On (semi)stable reduction and KSBA moduli in positive characteristic \nAbstract: The moduli space M_g of genus g stable curves is perhaps the most studied of all algebraic varieties. Its higher-dimensional generalization is the moduli functor M_{n\,v} of n-dimension stable varieties of volume v. It was proven only recently\, and thanks to the joint effort of many over many years\, that such functors are represented by projective algebraic spaces when working over the complex numbers. In this talk I will give some examples showing that the same moduli functors in positive characteristic are not even proper and\, more in general\, that the MMP fails to be functorial even in very nice families. In the second part I am going to explore some possible generalizations of the notion of stable variety that could be used as a replacement in positive characteristic.
URL:https://cmsa.fas.harvard.edu/event/agst-2824/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebraic Geometry in String Theory Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240222T103000
DTEND;TZID=America/New_York:20240222T113000
DTSTAMP:20260423T134005
CREATED:20240215T152956Z
LAST-MODIFIED:20240216T164834Z
UID:10000879-1708597800-1708601400@cmsa.fas.harvard.edu
SUMMARY:Geometric origins of values of the Riemann Zeta functions at positive integers
DESCRIPTION:Algebraic Geometry in String Theory Seminar \nSpeaker: Yan Zhou\, Northeastern \nTitle: Geometric origins of values of the Riemann Zeta functions at positive integers \nAbstract: Given a Fano manifold\, Iritani proposed that the asymptotic behavior of solutions to the quantum differential equation of the Fano should be given by the so-called ‘Gamma class’ in its cohomology ring. Later\, Abouzaid-Ganatra-Iritani-Sheridan reformulated the ‘Gamma conjecture’ for Calabi-Yau manifolds via the tropical SYZ mirror symmetry and proposed that values of the Riemann Zeta function at positive integers have geometric origins in the tropical periods and singularities of the SYZ geometry. In this talk\, we will first review the content of the Gamma conjecture. Then\, we will discuss the first step of generalizing AGIS’ approach to Gamma conjecture for the Gross-Siebert mirror families of a Fano manifold in dimension 2 cases\, based on joint work with Bohan Fang and Junxiao Wang.
URL:https://cmsa.fas.harvard.edu/event/agst-22224/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebraic Geometry in String Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Algebraic-Geometry-in-String-Theory-02.22.2024.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240229T103000
DTEND;TZID=America/New_York:20240229T113000
DTSTAMP:20260423T134005
CREATED:20240226T153440Z
LAST-MODIFIED:20240226T153514Z
UID:10000880-1709202600-1709206200@cmsa.fas.harvard.edu
SUMMARY:Classifying curves on Fano varieties
DESCRIPTION:Algebraic Geometry in String Theory Seminar \nSpeaker: Brian Lehmann (Boston College) \nTitle: Classifying curves on Fano varieties \nAbstract: How can we understand the set of curves on a Fano variety? One perspective is provided by Geometric Manin’s Conjecture\, a collection of conjectures with roots in arithmetic and topology.  While I will mention some recent progress\, the main focus will be developing a conceptual framework for thinking about our question.
URL:https://cmsa.fas.harvard.edu/event/agst-22924/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebraic Geometry in String Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Algebraic-Geometry-in-String-Theory-02.29.2024.docx-1.png
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