Monday, October 5th, 2026
Program Talk: Francisco Torres de lizaur
Time: 11:15 AM - 12:15 PM
Location: SCGP 313
Title: Remarks on Statistical Hydrodynamics
Speaker: Francisco Torres de lizaur
Title: Remarks on Statistical Hydrodynamics
Speaker: Francisco Torres de lizaur
Math Event: Symplectic Geometry, Gauge Theory, and Low-Dimensional Topology Seminar: Roman Krutowski - On Fukaya categories of cotangent bundles of global quotient orbifolds
Time: 12:30 PM - 1:55 PM
Location: Math P-131
Speaker: Roman Krutowski
Abstract: To any global quotient orbifold [X/G] provided by an effective action of a finite group G on a complex manifold X by biholomorphisms, one associates its Hecke algebra. The Hecke algebra is a deformation of the group algebra of the orbifold fundamental group of [X/G]. I will explain that, under some assumptions, the wrapped Fukaya category of the cotangent bundle T^*[X/G] recovers the orbifold Hecke algebra, as the 0-th cohomology of the endomorphisms of a regular fiber. One of the essential tools that we develop is the novel result on the obstructions to smoothings of nodal orbicurves. The talk reports on the joint work with Honda, Tian, and Yuan
Speaker: Roman Krutowski
Abstract: To any global quotient orbifold [X/G] provided by an effective action of a finite group G on a complex manifold X by biholomorphisms, one associates its Hecke algebra. The Hecke algebra is a deformation of the group algebra of the orbifold fundamental group of [X/G]. I will explain that, under some assumptions, the wrapped Fukaya category of the cotangent bundle T^*[X/G] recovers the orbifold Hecke algebra, as the 0-th cohomology of the endomorphisms of a regular fiber. One of the essential tools that we develop is the novel result on the obstructions to smoothings of nodal orbicurves. The talk reports on the joint work with Honda, Tian, and Yuan
Wednesday, October 7th, 2026
YITP Event: YITP Seminar Speaker: Peter Denton (Brookhaven)
Time: 3:30 PM - 4:30 PM
Location:
Title: CP-Violation with Neutrino Disappearance and NuFast
Abstract: The best way to probe CP violation in the lepton sector is with long-baseline accelerator neutrino experiments in the appearance mode. I will show that it is possible to discover CP violation with disappearance experiments only, by combining JUNO for electron neutrinos and DUNE or Hyper-Kamiokande for muon neutrinos. While the maximum sensitivity to discover CP is modest, some values of δ may be disfavored by > 3σ depending on the true value of δ. Neutrino oscillation experiments will be entering the precision era in the next decade. Correctly estimating the confidence intervals from data for the oscillation parameters requires very large Monte Carlo data sets involving calculating the oscillation probabilities in matter many, many times. In this talk, I will leverage past work to present a new, fast, precise technique for calculating neutrino oscillation probabilities in matter optimized for long-baseline neutrino oscillations called NuFast. I will also present recent results for atmospheric and solar neutrinos.
Title: CP-Violation with Neutrino Disappearance and NuFast
Abstract: The best way to probe CP violation in the lepton sector is with long-baseline accelerator neutrino experiments in the appearance mode. I will show that it is possible to discover CP violation with disappearance experiments only, by combining JUNO for electron neutrinos and DUNE or Hyper-Kamiokande for muon neutrinos. While the maximum sensitivity to discover CP is modest, some values of δ may be disfavored by > 3σ depending on the true value of δ. Neutrino oscillation experiments will be entering the precision era in the next decade. Correctly estimating the confidence intervals from data for the oscillation parameters requires very large Monte Carlo data sets involving calculating the oscillation probabilities in matter many, many times. In this talk, I will leverage past work to present a new, fast, precise technique for calculating neutrino oscillation probabilities in matter optimized for long-baseline neutrino oscillations called NuFast. I will also present recent results for atmospheric and solar neutrinos.
Math Event: Algebraic Geometry Seminar: Yongnam Lee - Degree of irrationality of properly elliptic surfaces
Time: 4:00 PM - 5:00 PM
Location:
Speaker: Yongnam Lee
Abstract: In this talk, we discuss the degree of irrationality of properly elliptic surfaces with a section. We establish a sharp lower bound using the canonical bundle formula and the Cayley–Bacharach property. We also study how the degree of irrationality varies in moduli. In particular, a very general properly elliptic surface with a section over a curve of genus at least two has degree of irrationality at least four, whereas certain special families with small holomorphic Euler characteristic have degree of irrationality two. We then investigate the case of properly elliptic surfaces with vanishing holomorphic Euler characteristic. If time permits, we will also discuss properly elliptic surfaces without a section. This is joint work with De-Qi Zhang.
Speaker: Yongnam Lee
Abstract: In this talk, we discuss the degree of irrationality of properly elliptic surfaces with a section. We establish a sharp lower bound using the canonical bundle formula and the Cayley–Bacharach property. We also study how the degree of irrationality varies in moduli. In particular, a very general properly elliptic surface with a section over a curve of genus at least two has degree of irrationality at least four, whereas certain special families with small holomorphic Euler characteristic have degree of irrationality two. We then investigate the case of properly elliptic surfaces with vanishing holomorphic Euler characteristic. If time permits, we will also discuss properly elliptic surfaces without a section. This is joint work with De-Qi Zhang.
Thursday, October 8th, 2026
Program Talk: Alexander Abanov
Time: 11:15 AM - 12:15 PM
Location: SCGP 313
Title: Emptiness formation in a quantum fluid: a hydrodynamic approach
Speaker: Alexander Abanov
Abstract: How likely is a macroscopic empty interval in a quantum fluid? I will discuss recent progress in computing this rare fluctuation probability in the Lieb-Liniger gas (arXiv:2608.26640) and an imaginary-time hydrodynamic approach in which Bethe-ansatz dressing is used to solve a mixed boundary-value problem for the hydrodynamic instanton. Reference: Boris A. Khanikati and Alexander G. Abanov, arXiv:2608.26640 (2026) Emptiness formation in the Lieb-Liniger gas: hydrodynamic instantons and a conjectured rate function
Title: Emptiness formation in a quantum fluid: a hydrodynamic approach
Speaker: Alexander Abanov
Abstract: How likely is a macroscopic empty interval in a quantum fluid? I will discuss recent progress in computing this rare fluctuation probability in the Lieb-Liniger gas (arXiv:2608.26640) and an imaginary-time hydrodynamic approach in which Bethe-ansatz dressing is used to solve a mixed boundary-value problem for the hydrodynamic instanton. Reference: Boris A. Khanikati and Alexander G. Abanov, arXiv:2608.26640 (2026) Emptiness formation in the Lieb-Liniger gas: hydrodynamic instantons and a conjectured rate function