Past Events

  • High Energy Seminar: "Entanglement, Holography and Causal Diamonds"

    David Rittenhouse Laboratory, 2N36

    Michal Heller (Perimeter Institute)

  • Condensed Matter seminar: "Unusual Fluctuations and Absorbing States"

    David Rittenhouse Laboratory, A4

    Dov Levine, Technion – Israel Institute of Technology

    Absorbing state models are far-from-equilibrium many-body systems which exhibit a phase transition with characteristics similar to those of a continuous equilibrium transition.  One major difference, however, which we have recently discovered, is that as the critical point is approached, spatial particle fluctuations decrease, resulting in a hyperuniform distribution with long-range correlations.  The effects of noise on these results will be discussed as well.

  • Astro Seminar: "Cosmology Constrains the Standard Model and Beyond!

    David Rittenhouse Laboratory, A4

    Amol Upadhye (University of Wisconsin-Madison)

    Neutrinos are Standard Model particles whose mass splittings are known, but whose absolute mass scale remains a mystery.  Cosmology provides the best upper bound on the sum of masses, 0.23 eV, a number intriguingly close to the dark energy scale, and promises to measure the neutrino masses over the next decade.  I describe the effects of massive neutrinos and evolving dark energy on the power spectrum of large-scale structure.  Working in the framework of higher-order cosmological perturbation theory, I show that the power spectrum in a wide variety of dark energy mod

  • Special Seminar - From viscous to elastic sheets: Dynamics of freely floating smectic films

    David Rittenhouse Laboratory - A4

    Kirsten Harth, Otto-von-Guericke Universität Magdeburg

    The dynamics of droplets and bubbles, particularly on microscopic scales, are of considerable importance in biological, environmental, and technical contexts. Soap bubbles, vesicles and components of biological cells are well known examples where the dynamic features are significantly influenced by the properties of thin membranes enclosed by fluids. Two-dimensional membrane motions couple to 3D shape transformations.

  • Math-Bio Seminar: "Fluctuation and fixation in the Axelrod model"

    318 Carolyn Lynch Lab

    Nicolas Lanchier, Arizona State University

    The Axelrod model is a spatial stochastic model for the dynamics of cultures which includes two key social components: homophily, the tendency of individuals to interact more frequently with individuals who are more similar, and social influence, the tendency of individuals to become more similar when they interact. Each individual is characterized by a collection of opinions about different issues, and pairs of neighbors interact at a rate equal to the number of issues for which they agree, which results in the interacting pair agreeing on one more issue.

  • Math-Bio Seminar: "The joint total tree length at linked loci in populations of variable size"

    318 Carolyn Lynch Lab

    Matthias Steinrücken, University of Massachusetts Amherst

    The inference of historical population sizes from contemporary genomic sequence data has gained a lot of attention in recent years. A particular focus has been on recent exponential growth in humans. This recent growth has had a strong impact on the distribution of rare genetic variants, which are of particular importance when studying disease related genetic variation. The popular PSMC method (Li and Durbin, 2011) can be used to infer population sizes from a sample of two chromosomes.

  • Eli Burstein Lecture in Materials Science: "Jamming by Design"

    Towne Building (220 S 33rd Street), Heilmeier Hall Room 100

    Heinrich Jaeger (Chicago)

    In materials science, high performance is typically associated with structural regularity and order. This holds for traditional solids such as crystals as well as for many types of nanoscale devices. However, there are circumstances where disorder can be harnessed to achieve performance not possible with approaches based on regularity. Recent research has shown opportunities specifically for soft matter.

  • Robert Maddin Lecture in Materials Science: "Finding New Electronic Materials"

    The Glandt Forum Krishna P. Singh Center for Nanotechnology

    Robert J. Cava (Princeton)

    “New materials give new properties” is a phrase that I think best describes the goal of our research program.

  • High Energy Theory: "TBA"

    David Rittenhouse Laboratory, 2N36

    Matthew Schwartz (Harvard)

  • Condensed Matter seminar: "Non-linear elasticity and relaxation in polymer networks and soft tissues"

    David Rittenhouse Laboratory, A4

    Paul Janmey, University of Pennsylvania

    The stiffness of tissues in which cells are embedded has effects on cell structure and function that can act independently of or override chemical stimuli.