Past Events

  • Experimental Particle Physics Seminar: "Coherent neutrino scattering"

    David Rittenhouse Laboratory, A8

    Kate Scholberg, Duke University

  • Condensed Matter seminar: "Patterning Superconductivity in a Topological Insulator"

    David Rittenhouse Laboratory, A4

    Nina Marković, Goucher College

    Topologically protected states in combination
with superconductivity hold promise for quantum
computing applications, but the progress on electrical
transport measurements in such systems has been impeded by the difficulty of obtaining devices with reliable electrical
contacts and fabricating circuits.

  • Astronomy seminar: "Primordial Black Holes as Dark Matter Candidates"

    David Rittenhouse Laboratory, A2

    Cristiano Germani (ICC, Barcelona)

    In this talk I will overview the physics of primordial black holes formation from single field inflationary models and discuss their statistical distribution.

  • High Energy Theory seminar: "Conformally Soft Photons and Gravitons"

    David Rittenhouse Laboratory, 2N36

    Laura Donnay, Harvard University

    In this talk, the four-dimensional S-matrix is reconsidered as a correlator on the celestial sphere at null infinity. Asymptotic particle states can be characterized by the point at which they enter or exit the celestial sphere as well as their SL(2,C) Lorentz quantum numbers: namely their conformal scaling dimension and spin instead of the energy and momentum. This characterization precludes the notion of a soft particle whose energy is taken to zero. I will propose it should be replaced by the notion of a "conformally soft" particle with h=0 or \bar h=0.

  • Women in Physics Public Lecture: "The Most Magnificent Map Ever Made"

    Ben Franklin Room, Houston Hall

    Beth Willman, University of Arizona

    For all of history, humans have observed the Milky Way galaxy by eye as a structure encircling our night sky. However, only within the last 100 years have humans learned that the Milky Way is not the only galaxy in the Universe. Within the last two decades, we have learned that the Sun is one of hundreds of billions of stars in the Milky Way, that the Milky Way is one of hundreds of billions of galaxies in the Universe, and that galaxies exist that are only one ten millionth as luminous as the Milky Way.

  • Advances in Biomedical Optics seminar: “Traumatic microvascular injury: A potentially treatable endophenotype of TBI"

    Donner Auditorium, Basement, Hospital of the University of Pennsylvania, 3400 Spruce St, Philadelphia, PA

    Ramon Diaz-Arrastia, University of Pennsylvania

    Pizza will be served at 11:45 am.

  • Primakoff Lecture: "Dark Matter, Neutron Stars, and Gravitational Waves"

    David Rittenhouse Laboratory, A8

    Ann Nelson, University of Washington

    The recent observation of gravitational waves from merging neutron stars opens a new era for neutron star physics and astrophysics. I discuss the dark matter mystery and some of my work on
    possible ways neutron stars can give clues about dark matter. Dark matter could be captured by neutron stars or their progenitors or produced during a supernovae and subsequently trapped
  • Special Condensed Matter seminar: "Anomalous charge and thermal transport in antiferromagnetic Weyl semimetals"

    David Rittenhouse Laboratory, 2N36

    Binghai Yan, Weizmann Institute of Science, Israel

    Topological Weyl semimetals provide a new stage to examine exotic transport phenomena such as the chiral anomaly and the anomalous Hall effect. In the ordinary longitudinal transport, the Wiedemann-Franz law links the ratio of electronic charge and heat conductivity to fundamental constants. It has been tested in numerous solids, but the extent of its relevance to the anomalous transverse transport, which represents the topological nature of the wave function, remains an open question. In this talk, I will first introduce recently-discovered Weyl materials Mn3Sn and Mn3Ge.

  • Joint High Energy Experiment/Theory seminar

    David Rittenhouse Laboratory, 2N36

    Zack Lasner, Yale University

  • Condensed Matter seminar: "Delving Into the Nanoscale World With Thin-Film Nanofluidic Devices"

    David Rittenhouse Laboratory, A4

    Jason R. Dwyer, University of Rhode Island

    Thin film nanofluidic devices offer a diverse range of platform architectures and capabilities for nanoscale sample characterization and single-molecule sensing.