Past Events

  • Dissertation Defense: Kind of Blue Phases: Controlling Topological Defects with Geometry and Anchoring Energy in Nematic and Cholesteric Liquid Crystals

    LRSM Reading Room

    Lisa Tran

  • Condensed Matter Seminar: "Wisdom of hives and mounds: collective problem solving by super-organisms"

    David Rittenhouse Laboratory, A4

    Lakshminarayanan Mahadevan (Harvard University)

    Social insects are capable of solving complex physiological problems using collective strategies. I will discuss our work on some of these problems  that include the physiology and morphogenesis of termite mounds, and  active mechanisms for ventilation, mechanical adaptation and  thermoregulation  in bee aggregates.

  • Astro Seminar: (TBA)

    David Rittenhouse Laboratory, A4

    TBA

  • Condensed Matter Seminar: "Ideas on magma motion within the lithosphere: percolation, channelization, and stress-driven segregation"

    David Rittenhouse Laboratory, A4

    Mousumi Roy (University of New Mexico)

    Although we know that magma is generated by partial melting of rocks at depth, we have less of an understanding of the processes that transport magma from great depths (>100-150 km) into the shallower (20-0 km) crustal plumbing systems of volcanic zones.   I shall discuss how interstitial melt migrates via percolative flow, and ideas on how it eventually becomes focused and reorganized into networks.  Field and geochemical observations suggest that these networks are characterized by thermal and chemical disequilibrium between the magma and surrounding rock.  I

  • Astro Seminar: "Dark Matter Clustering in the Dissipationless Limit"

    David Rittenhouse Laboratory, A4

    Michael Joyce (Sorbonne Université, Paris)

    An accurate description and understanding of matter clustering in the strongly non-linear regime, even neglecting baryonic physics, remains a problem which is relevant to cosmology and of fundamental interest. My talk will be structured around three questions about it: (1) How well do current simulations resolve this clustering? (2) Is the so-called "stable clustering" approximation a relevant one? (3) Are there really "universal" properties of non-linear clustering?

  • HET & HEE Joint Seminar: "Cosmological Bounces and Wormholes from Vorticity"

    David Rittenhouse Laboratory, 4N12

    David Kaplan (John Hopkins University)

  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Ted Jacobson (U of Maryland)

  • Workshop on Imaging Biomarkers

    Biomedical Research Building (BRB) II/III Auditorium and Lobby; 421 Curie Boulevard

    Welcome to the Fifth Annual CMROI Workshop on Imaging Biomarkers to be held Thursday, March 22

  • Condensed Matter Seminar: "Geometry and mechanics of feet and fins"

    David Rittenhouse Laboratory, A4

    Mahesh M. Bandi (Okinawa Institute of Science and Technology Graduate University)

    The stiffness of propulsive appendages, such as feet and fins, is important in locomotory function. In this talk, I show that curvature-induced stiffness is the common principle underlying the stiffness of both primate feet and rayed fish fins. We use mathematical models, physical models, and biological experiments to arrive at this conclusion. The principle is evident in a drooping dollar bill that significantly stiffens upon slightly curling it in the transverse direction.

  • High Energy Theory Seminar: "Discrete Superconformal Matter"

    David Rittenhouse Laboratory, 2N36

    Paul Oehlmann (Virginia Tech)

    We construct a novel type of (2,0) discrete charged superconformal matter coupled to 6d supergravity using F-theory. For this, we consider smooth genus-one fibered and compact Calabi-Yau threefolds quotiented by a freely acting automorphism. The resulting geometries exhibit orbifold singularities in the base with so-called multiple fibers over them which is where the (2,0) discrete charged matter resides. We show this presence to be necessary for anomaly cancellation which we proof in generality.