Past Events

MathBio seminar: "Quantitative methods for comparing T cell repertoires"
October 24, 2016  4:00 pm  5:00 pm
Carolyn Lynch Laboratory, 318
Philip Johnson, Univesity of Maryland
The vertebrate T cell adaptive immune response has the challenging task of recognizing all possible pathogens while not attacking "self." Evolution's solution to this challenge has been to generate a repertoire of T cells within a single individual via a process of recombination and intraindividual selection that creates a vast diversity of distinct T cell receptors (TCRs). The subset of this repertoire that respond to any particular infection can be qualitatively described as broad or narrow and public or private.

High Energy Seminar: "Recent Developments in 3D Dualities"
October 24, 2016  2:00 pm
David Rittenhouse Laboratory, 2N36
Jeff Murugan (University of Cape Town)
This summer has seen a flurry of activity in particlevortex duality and, more generally, in nonsupersymmetric dualities in three spacetime dimensions. Much of this work has been directly related to the properties of socalled topological quantum matter and gapped phases of matter. In this talk, I will give a moreorless pedagogical introduction to these ideas, beginning with the sineGordon/massive Thirring correspondence and building toward our current understanding of the 3dimensional web of dualities.

Condensed Matter seminar: "Entanglement dynamics following quantum quenches in Floquet topological insulators and quantum critical systems"
October 19, 2016  4:00 pm  5:00 pm
David Rittenhouse Laboratory, A4
Aditi Mitra, New York University
Recent years have shown that entanglement is a useful way to characterize quantum many body systems, however concrete results only exist in one spatial dimension. In this talk I will present results for the dynamics of the entanglement entropy and entanglement spectra in two dimensional Floquet Chern insulators realized by applying a timeperiodic perturbation to graphene.

Astro Seminar: "Understanding largescale structure from the CMB"
October 19, 2016  2:00 pm  3:00 pm
David Rittenhouse Laboratory, A4
Emmanuel Schaan (Princeton)
In this seminar, I will present two ways in which the cosmic microwave background (CMB) sheds light on critical uncertain physics and systematics of the largescale structure.
Shear calibration with CMB lensing (arXiv:1607.01761):

MathBio seminar: "TBA"
October 17, 2016  4:00 pm  5:00 pm
Carolyn Lynch Laboratory, 318
Erol Akcay, University of Pennsylvania

Condensed Matter seminar: "Quantum control and quantum error correction with superconducting circuits"
October 11, 2016  4:00 pm  5:00 pm
David Rittenhouse Laboratory, 2E17 (Faculty LoungeNote location change)
Mazyar Mirrahimi, INRIA (French Institute for Research in Computer Science and Automation)
The development of quantum Josephson circuits has created a strong expectation for reliable processing of quantum information. Active quantum error correction (QEC) is regarded as the next major step towards building a manyqubit (quantum bit) quantum processor, which is robust against dissipation/decoherence. To implement QEC, the quantum information is redundantly encoded in a highdimensional Hilbert space of a quantum system.

MathBio seminar: "Dimensionality reduction in the analysis of human genetics data"
October 10, 2016  4:00 pm  5:00 pm
Carolyn Lynch Laboratory, 318
Petros Drineas, Purdue University
Dimensionality reduction algorithms have been widely used for data analysis in numerous application domains including the study of human genetics. For instance, linear dimensionality reduction techniques (such as Principal Components Analysis) have been extensively applied in population genetics. In this talk we will discuss such applications and their implications for human genetics.

High Energy Seminar: "New Forms of Quantum Entanglement in Discretely Gauged Theories"
October 10, 2016  2:00 pm
David Rittenhouse Laboratory, 2N36
Vijay Balasubramanian (UPenn)

High Energy Seminar: "New Forms of Quantum Entanglement in Discretely Gauged Theories"
October 10, 2016  2:00 pm
David Rittenhouse Laboratory, 2N36
Vijay Balasubramanian (UPenn)

Condensed Matter seminar: "Engineering new materials from old materials"
October 5, 2016  4:00 pm  5:00 pm
David Rittenhouse Laboratory, A4
Cory Dean, Columbia University
Graphene is probably the best known "exfoliatable" material, in which a twodimensional sheet of carbons atoms, just one atom thick, can be peeled from a bulk piece of graphite. However this represents just one of a larger class of van der Waals materials, in which atomic monolayers can be mechanically isolated from the bulk. The capability to integrate these materials with one another provides an exciting opportunity in which we can "mix and match" the constituent material properties, by fabrication of multilayered heterostructures. In this talk