1. Finn Larson

    25:49

    from UK College of Arts & Sciences / Added

    3 Plays / / 0 Comments

    Finn Larson presenting at Great Lakes String 2013

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    • Ufek Aydemir

      31:49

      from UK College of Arts & Sciences / Added

      0 Plays / / 0 Comments

      Ufek Aydemir presenting at Great Lakes String 2013

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      • Cosmic Linear Accelerators: Extreme Reconnection and other Surprises from the Crab Nebula

        01:11:43

        from UK College of Arts & Sciences / Added

        16 Plays / / 0 Comments

        The unexpected discovery of gamma-ray flares from the Crab Nebula may have surprising implications for plasma astrophysics. Standard particle acceleration mechanisms cannot account for the energies of the flaring photons. Instead, these observations point toward an acceleration process involving rapid destruction of magnetic field through reconnection. I will discuss the extreme particle acceleration process that may lead to the flares, and the likely role of current-driven instabilities in triggering reconnection in the Crab and elsewhere.

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        • Sergei Khlebnikov

          27:25

          from UK College of Arts & Sciences / Added

          5 Plays / / 0 Comments

          Sergei Khlebnikov presenting at Great Lakes String 2013

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          • Alex Buchel

            33:07

            from UK College of Arts & Sciences / Added

            5 Plays / / 0 Comments

            Alex Buchel presenting at Great Lakes String 2013

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            • Colloquium: Discovery of a North-South Asymmetry in the Distribution of Local Stars and its Implications

              01:10:33

              from UK College of Arts & Sciences / Added

              7 Plays / / 0 Comments

              Studies which would try to fix the local dark matter density through observations of the nearby stars invariably assume that the stars are in gravitational equilibrium. In recent years, however, it has become clear that the Milky Way displays many transient phenomena; it is a much more violent place than earlier thought. I will show how observations of the local solar neighborhood from the Sloan Digitial Sky Survey can probe the vertical equilibrium of the Galactic disk, by testing the symmetries present in the stars' distribution. Our analysis reveals a failure of north-south symmetry with respect to the galactic plane and thus that vertical equilibrium is wanting. I will consider our result in light of other observational studies, suggest further observational tests, and finally offer a perspective on its implications for dark-matter direct detection experiments.

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              • 2013 Colloquium: Quantum Criticality in Spin Systems

                01:32:01

                from UK College of Arts & Sciences / Added

                12 Plays / / 0 Comments

                Close to the absolute zero of temperature, when pushed to the edge between two phases of matter, simple lattice Hamiltonians of spins can display the incredibly rich phenomena of "quantum criticality". Quantum critical ground states are described by the most complex wavefunctions known to physicists, yet they can be categorized by "universality classes" that are independent of the details of the Hamiltonians that realize them. In this colloquium I will show how such quantum critical spin systems can arise in real-world materials, and explain our successes in developing quantum many-body simulations of a new universality class of deconfined quantum critical points.

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                • TITLE

                  54:52

                  from UK College of Arts & Sciences / Added

                  10 Plays / / 0 Comments

                  Dr. Geoff Greene University of Tennessee, Knoxville While neutrons within nuclei may be stable, the free neutron is unstable against beta decay and has a mean lifetime of ~15min. Free neutron beta decay is, perhaps, the simplest weak nuclear process as it is uncomplicated by many body effects that are present in the decay of nuclei. As a result, it can be directly understood in terms of rather simple fundamental weak interaction theory. Additionally, because free neutron decay is the "prototype" for all nuclear beta decays, the neutron lifetime is a fundamental parameter whose value is important not only in nuclear physics, but also in astrophysics, cosmology, and particle physics. I will give an introduction to the theory of weak nuclear decay and briefly discuss the importance of the neutron lifetime as a parameter in the Big Bang. A review of the experimental strategies for the measurement of the neutron lifetime will be given as well as a discussion of the puzzling discrepancy among the measurements with the lowest quoted uncertainty. Finally, I present a very new result recently obtained at the NIST Cold Neutron Research Facility in Gaithersburg Md.

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                  • Nicolas Regnault

                    28:51

                    from UK College of Arts & Sciences / Added

                    15 Plays / / 0 Comments

                    Nicolas Regnault presenting at the Great Lakes Strings 2013.

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                    • Diagnostic Development Unit (DDU) University of Leicester

                      02:35

                      from University of Leicester / Added

                      29 Plays / / 0 Comments

                      The Diagnostic Development Unit (DDU) is a non-invasive disease detection facility, developed by the University of Leicester for use in Leicester Royal Infirmary's A&E department. It is designed to detect the "sight, smell and feel" of disease without the use of invasive probes, blood tests, or other time-consuming and uncomfortable procedures. One group of instruments analyses gases present in a patient's breath, a second uses imaging systems and technologies to hunt for signs of disease via the surface of the human body, the third uses a suite of monitors to look inside the body and measure blood-flow and oxygenation in real-time. University of Leicester researchers from space research, emergency medicine and Chemistry, worked with colleagues in Cardiovascular Sciences, Infection, Immunity and Inflammation, Physics and Astronomy, Engineering, IT Services and the Leicester Royal Infirmary to create the Unit.

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