Past Events

  • High Energy Theory Seminar: (Stochastic Particle Production in the Early Universe)

    David Rittenhouse Laboratory, 2N36

    Mustafa Amin (Rice University)

    I will show some intriguing hints of universality in the occupation number of spectator/daughter fields that experience repeated stochastic particle production during inflation and reheating. The calculations are aided by a remarkable mathematical mapping between stochastic particle particle production in cosmology and current conduciton in disordered wires. Time permitting, I will discuss potential implications of the results for density perturbations from the early universe.

  • Condensed Matter Seminar: "Long Term 3D Imaging by FIBSEM for Neurons and Cell Biology and Correlation to Cryo Fluorescence Microscopy"

    David Rittenhouse Laboratory, A4

    Harald Hess (Howard Hughes Medical Institute, Janelia Research Campus)

    3D Electron microscopy volume data can be acquired by a variety of approaches.  Focused Ion beam – scanning electron microscopy, FIBSEM, offers no limitation on section thickness, so that isotropic voxels with 8 nm or less sampling in x,y,z dimensions can be acquired.  This capability opens a new regime where entire cells can be imaged with 4 nm voxel sampling, thereby surpassing partial cell or section limitations to complete cell data.

  • Astro Seminar: “Information from Cosmological Data”

    David Rittenhouse Laboratory, A4

    Ben Wandelt (CCA/Paris)

  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Walter Goldberger (Yale)

  • HET & HEE Joint Seminar: (TBA)

    David Rittenhouse Laboratory, 4N12

    Michael Ramsey-Musolf (UMass Amherst)

  • 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?

  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Ted Jacobson (U of Maryland)