Events

  • Astro Seminar:"Probing Galaxy Formation with Modern Cosmological Simulations"

    David Rittenhouse Laboratory, A4

    Paul Torrey (MIT)

    Cosmological simulations are among the most powerful tools available to probe the non-linear regime of cosmic structure formation.  They also provide a clear test-bed for understanding the impact that hydrodynamics and feedback processes have on the evolution of galaxies.  I will present an overview of modern galaxy formation simulations that couple a novel moving mesh computational method with explicit baryon feedback prescriptions.

    view more..

  • Condensed Matter Seminar: "Enhanced optical and magnetic microscopy by orientation-dependent modulation of single-molecule and nitrogen-vacancy-center emission"

    David Rittenhouse Laboratory, A4

    Mikael Backlund (Harvard University)

    Selection rules impose geometrical constraints on the interactions of light and matter. In
    particular, an emitter with a well-defined orientation will emit photons of a characteristic
    polarization and wavevector distribution, even as viewed in the far field. Knowledge of these
    distributions can be leveraged to enhance a number of state-of-the-art microscopy techniques. In
    the first part of the talk I will discuss such an approach to single-molecule localization
    microscopy, relevant for single-molecule tracking and super-resolution imaging. It is known that

    view more..

  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Rob Leigh (U of Illinois - Urbana Champaign)

  • Condensed Matter Seminar: "Structure and Topology of Band Structures in the 1651 Magnetic Space Groups"

    David Rittenhouse Laboratory, A4

    Ashvin Vishwanath (Harvard University)

    We describe a powerful theoretical approach to studying electronic band structures, which associates them with elements of a vector space. The set of consistent band structures in a space group can then be expanded in terms of a small set of basis vectors. We calculate the dimension of this vector space, and the necessary electron fillings to obtain band insulators in all magnetic space groups.

    view more..

  • Astro Seminar: "Cosmic Microwave Backlight: Illuminating Large-Scale Structure with the Universe's Oldest Photons"

    David Rittenhouse Laboratory, A2

    Colin Hill (IAS/Flatiron Institute)

    Studies of the cosmic microwave background (CMB) radiation have driven the current era of precision cosmology.  The tightest cosmological constraints to date have been derived from the primary CMB anisotropies, which predominantly probe the universe in its infancy.  However, CMB experiments have recently entered a new regime in which constraints derived from the secondary anisotropies -- sourced by effects between our vantage point and the surface of last scattering -- substantially improve upon those derived from the primary anisotropies alone.

    view more..

  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Netta Engelhardt (Princeton)

  • HET & HEE Joint Seminar: (TBA)

    David Rittenhouse Laboratory, 4N12

    Cliff Cheung (Caltech)

  • Astro Seminar: "The Chaotic Life Cycles of Planetary Systems"

    David Rittenhouse Laboratory, A4

    Daniel Tamayo (University of Toronto)

    The past two decades have seen the discovery of thousands of new planetary systems in our galactic neighborhood, many of which look drastically different from our own. However, despite this remarkable observational achievement, we are still struggling to generate theoretical frameworks capable of explaining their divergent evolutionary paths. In particular, a central challenge is modeling the often chaotic orbital evolution of planetary systems over typical lifetimes of billions of years, which sculpts the distribution of orbital architectures that we observe at the present day.

    view more..

  • Astro Seminar: (TBA)

    David Rittenhouse Laboratory, A4

    Joy Didier (USC)

  • 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.

    view more..