Seminars & Events for 2017-2018

December 5, 2017
3:00pm - 4:30pm
Attractors: "when inertial waves meet topography..."
Speaker: Laure Saint-Raymond, Minerva Distinguished Visitor, Princeton University and Professor, École Normale Supérieure de Lyon
Location:
Fine Hall 1201
December 5, 2017
4:30pm - 5:30pm
Foliated surfaces and their stable reduction.

In 1977 Bogomolov proved that on surfaces of general type with c_1^2>c_2, curves of a given genus form a bounded family. The role played by foliations in his proof was further investigated by McQuillan, who in 1998 proved the Green-Griffiths conjecture for surfaces of general type with c_1^2>2c_2.

Speaker: Federico Buonerba, New York University
Location:
Fine Hall 322
December 5, 2017
4:30pm - 5:30pm
Bulk-Edge Duality and Complete Localization for Chiral Chains

We study one dimensional insulators obeying a chiral symmetry in the single-particle picture where the Fermi energy is assumed to lie within a mobility gap. Topological invariants are defined for infinite (bulk) or half-infinite (edge) systems, and it is shown that for a given bulk system with nearest neighbor hopping, the invariant is equal to the induced-edge-system's invariant.

Speaker: Jacob Shapiro, ETH
Location:
Jadwin Hall 343
December 5, 2017
4:45pm - 5:45pm
TBA-Jun Su
Speaker: Jun Su, Princeton University
Location:
IAS Room S-101
December 6, 2017
2:30pm - 3:30pm
Reconstructing 3D protein crystal intensity from unoriented sparse diffraction patterns

The femtoseconds long pulses of an X-ray free electron laser (XFEL) enable the measurement to outrun the irreversible radiation damage. This concept of `diffract before destroy’ inspires new methods such as serial crystallography, which determines 3D protein structures by merging 2D snapshots of microcrystals collected at random orientations.

Speaker: Ti-Yen Lan, Cornell University
Location:
Fine Hall 224
December 7, 2017
12:30pm - 1:30pm
The Kuga-Satake construction.

The Kuga-Satake construction associates an abelian variety (the Kuga-Satake variety) to certain weight two Hodge structure, for example the second cohomology group of a K3 surface. I will discuss the construction, and its applications to the Weil conjecture, the Hodge conjecture, and the Tate conjecture (related to K3 surfaces).

Speaker: Congling Qiu, Princeton University
Location:
Fine Hall 110
December 7, 2017
4:30pm - 5:30pm
From counting Markoff triples to Apollonian packings; a path via elliptic K3 surfaces and their ample cones

The number of integer Markoff triples below a given bound has a nice asymptotic formula with an exponent of growth of 2.  The exponent of growth for the Markoff-Hurwitz equations, on the other hand, is in generalnot an integer.  Certain elliptic K3 surfaces can be thought of as smooth generalizations of the Markoff surface.  Like the Markoff surface, their group of automorphisms is discrete and

Speaker: A.Baragar, University of Nevada Las Vegas
Location:
IAS Room S-101
December 7, 2017
4:30pm - 5:30pm
TBA-Gautam Iyer
Speaker: Gautam Iyer, Carnegie Mellon University
Location:
Fine Hall 322
December 7, 2017
4:30pm - 5:30pm
Chern-Simons functional and the Homology Cobordism Group

The set of 3-manifolds with the same homology as the 3-dimensional sphere, modulo an equivalence relation called *homology cobordance*, forms a group.

Speaker: Aliakbar Daemi, SCGP
Location:
Fine Hall 314
December 8, 2017
3:00pm - 4:00pm
TBA-Cary Malkiewich
Speaker: Cary Malkiewich, Binghamton University
Location:
Fine Hall 110
December 11, 2017
3:00pm - 4:00pm
Ruixiang Zhang
Speaker: Ruixiang Zhang, IAS
Location:
Fine Hall 314
December 11, 2017
4:00pm - 5:00pm
TBA-Lenny Ng
Speaker: Lenny Ng, Duke University
Location:
IAS Room S-101
December 12, 2017
3:00pm - 4:30pm
Quasi-resonant forcing: "how generalized eigenfunctions can be observed in a bowl..."
Speaker: Laure Saint-Raymond, Minerva Distinguished Visitor, Princeton University and Professor, École Normale Supérieure de Lyon
Location:
Fine Hall 1201
December 12, 2017
4:30pm - 5:30pm
Explicit equations of a fake projective plane.

Fake projective planes are complex algebraic surfaces of general type whose Betti numbers are the same as that of a usual projective plane. The first example was constructed by Mumford about

Speaker: Lev Borisov, Rutgers University
Location:
Fine Hall 322
December 13, 2017
3:00pm - 4:00pm
TBA-Guy Bresler
Speaker: Guy Bresler, MIT
Location:
Fine Hall 214
December 14, 2017
12:30pm - 1:30pm
TBA-Laura Shou
Speaker: Laura Shou, Princeton University
Location:
Fine Hall 110
December 14, 2017
3:00pm - 4:00pm
TBA- Greg Bodwin
Speaker: Greg Bodwin, MIT
Location:
Fine Hall 224
December 14, 2017
4:30pm - 5:30pm
TBA - Tye Lidman
Speaker: Tye Lidman, North Carolina State University
Location:
Fine Hall 314
December 14, 2017
4:30pm - 5:30pm
TBA-Junecue Suh
Speaker: Junecue Suh, UC Santa Cruz
Location:
Fine Hall 214
February 8, 2018
3:00pm - 4:00pm
TBA-Michael Harrison, Lehigh University
Speaker: Michael Harrison, Lehigh University
Location:
Fine Hall 110

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