Past Events

  • Special Seminar: "Exploiting the roles of photon spin and electron spin in light-matter interaction"

    David Rittenhouse Laboratory, A6

    Li He (University of Minnesota)

    In light-matter interaction, the conservation of angular momentum requires the angular momentum transfer between light and matter, which consequently couples light polarization to various state variables of materials, such as mechanical motion, magnetization or charge current, and gives rise to a plethora of intriguing phenomena. In this talk, I will discuss the angular momentum transfer in two different scenarios with a focus on the roles of photon and electron spin.

  • Condensed Matter Seminar: "The physical chemistry of natural selection: How can we explain the high yields and high rates of biochemical reactions?"

    David Rittenhouse Laboratory, A4

    Jean-Louis Sikorav (Ministère de l'Economie et des Finances)

    The goal of this seminar is to present the main findings of an ongoing inquiry of the foundations of biology (1). The purpose of this investigation is to describe the elements, the logic and the principles of biology, and to construct biological theories using the language and the methods employed in other disciplines. This work brings to the fore the existence of a unity of knowledge, also revealed through the study of the science of research shared by all disciplines (2).

  • Astro Seminar: **POSTPONED UNTIL THE FALL**

    David Rittenhouse Laboratory, A4

    David Kipping (Columbia)

  • 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