Past Events

  • 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

  • Security and Donuts (and 2-Step enrollment)

    Physics Faculty Lounge

    Nick Salvatore, Chris Lake, and Shaheen Beg

    In observance of National CyberSecurity Awareness Month, Nick Salvatore, Chris Lake, and Shaheen Beg will be hosting an Information Security Outreach day next week. If you need help with setting up 2-Step Authentication, have questions about how secure your research data is, or if you just like donuts, stop by our event!

  • 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.

  • Condensed Matter Seminar: "Topological Origin of Equatorial Waves"

    David Rittenhouse Laboratory, A6

    Brad Marston, Brown University

    Topology sheds new light on the emergence of unidirectional edge waves in a variety of physical systems, from condensed matter to artificial lattices. Waves observed in geophysical flows are also robust to perturbations, which suggests a role for topology. We show a topological origin for two celebrated equatorially trapped waves known as Kelvin and Yanai modes, due to the Earth’s rotation that breaks time-reversal symmetry. The non-trivial structure of the bulk Poincare ́ wave modes encoded through the first Chern number of value 2 guarantees existence for these waves.

  • Experimental Particle Physics Seminar: "Solar neutrino sensitivity of DUNE"

    David Rittenhouse Laboratory, 2C2

    Shirley Li, SLAC

  • Astronomy seminar: "Reverse Engineering the local Universe"

    David Rittenhouse Laboratory

    Edoardo Carlesi, IAP Potsdam

    Constrained simulations (CS) provide a powerful alternative approach to the random-phase Initial Conditions (ICs) cosmological simulations. In this method, galaxy peculiar velocity measurements are used to reconstruct the matter density field and generate a set of ICs whose final outcome closely matches the observed Universe. Hence, while the results obtained with the standard techniques can be compared to the data in a statistical sense only, in a CS we can exploit the constraining potential of the high-precision near-field observations by means of a direct comparison.