Past Events

  • High Energy Theory Seminar: "Black Hole Microstate Cosmology"

    David Rittenhouse Laboratory, 2N36

    Brian Swingle, University of Maryland, College Park

    I will discuss the possibility that certain high-energy holographic CFT states correspond to black hole microstates with a geometrical behind-the-horizon region, modelled by a portion of a second asymptotic region terminating at an end-of-the-world (ETW) brane. The ETW boundary geometry takes the form of a closed FRW spacetime, and, in many cases, this behind-the-horizon physics can be probed directly by looking at the time dependence of entanglement entropy for sufficiently large spatial CFT subsystems.

  • Special Seminar: "This Is Not A Diversity Talk" - POSTPONED MAKE UP DATE TBD

    David Rittenhouse Laboratory, A8

    John A. Johnson, The Harvard-Smithsonian Center for Astrophysics

    The American discourse on the various disparities present in society generally, and academia specifically, focuses primarily on observations of the state of a given situation---e.g. a lack of diversity---rather than on the actions that lead to such a state. This approach is just as dissatisfying and ultimately ineffectual as observing that certain stars are "bright," rather than describing any of the physical principles that lead to the observed properties of a star.

  • Condensed Matter Seminar: "Terahertz-frequency light fields driving quantum material electrons, ions, and spins"

    David Rittenhouse Laboratory, A6

    Keith Nelson, Massachusetts Institute of Technology

    Terahertz-frequency light pulses can now be generated routinely with field amplitudes sufficient to drive highly nonlinear responses of materials and molecules.

  • Experimental Particle Physics Seminar: "Short-range correlation studies in nuclei"

    David Rittehouse Laboratory, A8

    Or Hen, MIT

  • Astronomy seminar: "Measurements of Degree-Scale B-mode Polarization with the BICEP/Keck Experiments at South Pole"

    David Rittehouse Laboratory, A6

    Benjamin Racine, Harvard-Smithsonian Center for Astrophysics

    The BICEP and Keck experiments, located at the South Pole, are currently observing the polarized microwave sky at the degree scale using refractive telescopes. They are searching for a signature of primordial gravitational waves in the so-called B modes of the cosmic microwave background (CMB), parametrized with the tensor-to-scalar ratio r. In this talk I will introduce our latest analysis which includes BICEP2 and Keck array data up to the end of 2015.

  • Condensed Matter Seminar: "Adhering, wrapping, and bursting of fluid membranes: understanding effects of membrane-binding particles and polymers"

    David Rittenhouse Laboratory, A6

    Anthony (Tony) Dinsmore, University of Massachusetts, Amherst

    Proteins and membranes form remarkably complex structures that are key to intracellular compartmentalization, cargo transport, and cell morphology. Despite this wealth of examples in living systems, we still lack design principles for controlling membrane morphology in synthetic systems. With experiments and simulations, we show that even the simple case of spherical nanoparticles binding to lipid-bilayer membrane vesicles results in a remarkably rich set of morphologies that can be reliably controlled via the particle binding energy.

  • Astronomy seminar: "TBA"

    David Rittenhouse Laboratory, A6

    Barth Netterfield, University of Toronto

  • Condensed Matter Seminar: "Taming Quantum Entanglement"

    David Rittenhouse Laboratory, A6

    Matthew Fisher, University of California, Santa Barbara

    Non-local quantum entanglement - “spooky action at a distance” - is the key feature that dis- tinguishes quantum from classical systems. The entanglement-entropy provides a measure of en- tanglement and for many-body systems is intimately connected to the thermal-entropy. Out of equilibrium, in a driven system or after a quantum quench, entanglement spreads ballistically with maximal entropy attained at long times - that is, complete disorder reigns. But not (always!) with life on earth! Why?

  • Experimental Particle Physics Seminar: "Recent results from T2K"

    David Rittenhouse Laboratory, A8

    Alysia Marino, University of Colorado

  • Astronomy seminar: "The Hunt for Exomoons"

    David Rittenhouse Laboratory, A6

    David Kipping, Columbia University

    Since astronomers first started detecting exoplanets, interest in possible exomoons soon followed. Moons could be habitable worlds in their own right but also influence the habitability of planets they orbit. Besides from habitability, discovering moons would provide rich insights into the formation and evolution of planetary systems, potentially revealing the banality/uniqueness of our own solar system’s architecture.