September 2: Kalina Mincheva (Tulane U.) Integral Elements and normalization in tropical geometry.
Abstract: This work is part of a broader program to develop necessary commutative algebra tools for the semirings arising from tropicalization. We will discuss different notions of integrality which while equivalent for rings are not for idempotent semirings. We will define integral closure and give different characterizations. If time permits we will give some examples of normalization in tropical geometry.
September 16: Junyao Peng (Princeton) Asymptotics of stability thresholds
Abstract: We study asymptotic behavior of the stability thresholds of a big line bundle, and prove explicit bounds on the error terms. This improves a theorem of Jin--Rubinstein--Tian by removing the assumption on the existence of a divisorial minimizer. A key step in our proof is to show that the stability thresholds of a big line bundle can always be computed by quasi-monomial valuations. This generalizes Blum--Jonsson's result on the stability thresholds of an ample line bundle.
September 23: Jaiung Jun (State University of New York at New Paltz) Commutative algebra of semirings and applications
Abstract: Semirings naturally arise in various contexts, including tropical geometry and geometry over the field with one element. In this talk, I will introduce some basic aspects of semirings and explore their applications to scheme theory over semirings, with a particular focus on line bundles and vector bundles. This is joint work with James Borger.
September 30: Trevor Jones (JHU) Projectivity of the Moduli Space of Equidimensional Branchvarieties
Abstract: A branchvariety of a projective k-scheme X is a geometrically reduced scheme Y equipped with a finite map to X. Alexeev and Knutson showed the existence of a proper moduli space of branchvarieties with fixed numerical invariants, but the projectivity of this space remained an open question. In this talk, we will discuss positivity results for some line bundles related to the determinant line bundle on the moduli space of equidimensional branchvarieties. As a consequence, we establish that this moduli space is projective.
October 7: Daniil Serebrennikov, preprint seminar
October 14: Soham Karwa (Duke)
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October 21: Minghao Miao (Nanjing University)
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October 28: Zhiyuan Chen (Princeton)
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November 4: Jonathan Beardsley (U. Nevada Reno)
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November 11: Minghao Zhao, preprint seminar
November 18: Lena Ji (UIUC)
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