Events

  • Astro Seminar: "Fundamental Physics from the Non-linear Universe"

    David Rittenhouse Laboratory, A4

    Marcel Schmittfull (IAS)

    The cosmology community is running a large program of galaxy surveys over the next 10 years. Our goal is to map out the properties of dark energy as a function of time, measure the sum of neutrino masses, and study the origin of the Universe with unprecedented precision. A key limitation for these efforts is how to extract cosmological information from small scales that are affected by nonlinear dynamics.

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  • Condensed Matter Seminar: "Magnetism in Amorphous Alloys"

    David Rittenhouse Laboratory, A4

    Frances Hellman (University of California at Berkeley)

    Most condensed matter textbooks start by introducing crystal symmetries and the periodic lattice as foundational to the field.  Yet, it has long been known that the amorphous structure supports ferromagnetism, superconductivity, and a host of other condensed matter properties.  Superconductivity theory was famously expanded from the original Bloch wave pairing to be described as pairing of electrons with time-reversed wavefunctions to enable explanation of superconductivity in amorphous systems where electrons in the normal state have a mean free path of approximately an

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  • *Special* HET Seminar: "Many-body Localization: Breakdown of Thermalization in Quantum Matter"

    David Rittenhouse Laboratory, 4N12

    Arijeet Pal (Oxford)

    Until recently interacting many-particle systems governed by the laws of quantum mechanics were assumed to eventually reach thermal equilibrium, being described by equilibrium statistical physics. Rapid developments in theory and experiments in the last decade have established a phase of matter where this assumption is false, due to a phenomenon known as many-body localization (MBL). In this phase, the system undergoing unitary time dynamics retains the memory of the initial state in local observables for infinitely long times.

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  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Silviu Pufu (Princeton University)

  • Condensed Matter Seminar: "The Structure and Function of Organic-Inorganic Hybrid Perovskites"

    David Rittenhouse Laboratory, A4

    Cherie Kagan (University of Pennsylvania)

    Organic-inorganic hybrid perovskites represent a class of materials composed of corner sharing metal halide octahedra charge balanced by organic cations. The hybrid perovskites may be tailored in their composition and in their dimensionality. Research exploring hybrid perovskites skyrocketed in the past few years because of the remarkable, >20% power conversion efficiency demonstrated for the three-dimensional (3D) lead halide structures in solar cells, which currently rivals that of commercial silicon-based solar cells.

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  • WIP: "A Cosmic Perspective: Searching for Aliens, Finding Ourselves"

    Penn Museum, Harrison Auditorium University of Pennsylvania

    Dr. Jill Tarter (Bernard Oliver Chair for Search for Extra-Terrestrial Intelligence (SETI) Institute)

    Are we alone? Humans have been asking this question throughout history. We want to know where we came from, how we fit into the cosmos, and where we are going. We want to know whether there is life beyond the Earth and whether any of it is intelligent.  

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  • Condensed Matter Seminar: "Dark Matter Superfluidity"

    David Rittenhouse Laboratory, A4

    Justin Khoury (University of Pennsylvania)

    In this talk I will discuss a theory of superfluid dark matter. The scenario matches the predictions of the standard Lambda-Cold-Dark-Matter (LambdaCDM) model on cosmological scales while simultaneously reproducing the MOdified Newtonian Dynamics (MOND) empirical success on galactic scales.

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  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Andrei Khmelnitsky (ICTP)

  • Physics Department Colloquium: "Statistical Physics of Complex Polymeric Molecules"

    David Rittenhouse Laboratory - A8

    Robijn Bruinsma (UCLA) hosted by Joe Kroll

    Statistical physics methods have been applied with great success to simple polymeric molecules such as linear polymers, polymer brushes, and gels. The application of these same methods to polymeric molecules with branching and circuits, such as large RNA molecules and other biomolecules, has however proven to more difficult. In the colloquium, I will discuss recent progress that was made in the study of such molecules by combining graph-theoretical concepts with statistical physics methods and large-scale computation.

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  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Levon Pogosian (Simon Fraser University)