1. Taylor Hughes

    29:15

    from UK College of Arts & Sciences / Added

    18 Plays / / 0 Comments

    Taylor Hughes presenting at Great Lakes Strings 2013.

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    • A&S Wired: Measuring Science with an iPad

      02:11

      from UK College of Arts & Sciences / Added

      186 Plays / / 0 Comments

      Mike Cavagnero, the Chair of the Department of Physics and Astronomy, was one of the initial faculty members to teach a class in A&S Wired in Fall of 2011. His class was titled Measuring Science. This video showcases the students' final projects, in which they used their iPads as a tool to help in their research, data and analysis.

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      • Galaxy Build-up at Cosmic Dawn: New Insights from Ultra-Deep Hubble and Spitzer Observations

        49:41

        from UK College of Arts & Sciences / Added

        25 Plays / / 0 Comments

        Dr. Pascal Oesch Space Telescope Science Institute Thanks to ultra-deep observations with the WFC3/IR camera on Hubble the frontier of galaxies has recently been pushed out to z~9-12, only ~450 Myr from the Big Bang. From several large Hubble programs such as the HUDF09, CANDELS, or CLASH, we were able to identify large samples of more than 200 galaxies at z~7-8, and we are now starting to build up the sample sizes of z~9-11 galaxy candidates. In particular, the recent HUDF12 campaign further increased the depth of the WFC3/IR dataset over the Hubble Ultra-Deep Field (HUDF), and enabled us to detect a sample of nine very faint z>8 galaxy candidates in the HUDF. Additionally, the newly completed CANDELS data over GOODS-North now revealed four relatively bright z~9-10 sources, which are in tension with the previous UV LF determination from the GOODS-South field, indicating that star-formation in the early universe might have been very stochastic. Using all z>8 candidates in and around both GOODS fields, we infer that the cosmic star-formation rate density in galaxies with SFR>0.7Msol/yr decreases rapidly at z>8, dropping by an order of magnitude from z~8 to z~10. With complementing, ultra-deep Spitzer IRAC data, we are additionally able to infer the stellar mass densities out to z~8-10. In this talk I will highlight recent progress in exploring the high redshift frontier and in understanding the growth of galaxies in the first two billion years. In particular, I will present current constraints on the UV luminosity function of galaxies at z>8, and I will demonstrate the power of combining deep Hubble and Spitzer data to directly track the star-formation and mass build-up of z>=4 galaxies.

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        • Higgs Discovery: Implications for Particle Physics - 2 Nov. 2012

          01:16:16

          from UK College of Arts & Sciences / Added

          55 Plays / / 0 Comments

          The LHC has recently discovered a Higgs-like resonance with a mass of about 125 GeV. It may be the missing element of the so-called Standard Model of particle physics. This model was proposed a few decades ago, and, after the inclusion of neutrino masses, describes in an accurate way all measured observables not involving gravity. We shall discuss what are the possible implications of the Higgs Discovery for particle physics and, in particular, for theoretical and experimental physics High Energy Physics in the coming years.

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          • David Turton

            01:08:46

            from UK College of Arts & Sciences / Added

            21 Plays / / 0 Comments

            David Turton presenting at Great Lakes Strings 2013.

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            • Undergraduate Research at UK

              04:29

              from UK College of Arts & Sciences / Added

              31 Plays / / 0 Comments

              Students, as well as A&S faculty members Chris Crawford (Physics) and Melody Carswell (Psychology) talk about the undergraduate research opportunities at UK. This video appears courtesy of Reveal: University of Kentucky Research Media http://www.research.uky.edu/reveal/index.shtml

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              • Picking Up Pieces of the Puzzle

                04:17

                from Penn Arts & Sciences / Added

                14 Plays / / 0 Comments

                Cosmologist Mark Devlin builds a telescope that floats to the edge of space.

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                • Gauge fields with cold atoms

                  01:32:01

                  from UK College of Arts & Sciences / Added

                  15 Plays / / 0 Comments

                  Gauge fields are ubiquitous in Physics. For example, in the context of high energy physics, they are the fundamental carrier of forces; while in condensed matter systems the associated physical fields (electrical and magnetic) are essential in creating and understanding many-body phenomena. Here I present our experimental work synthesizing static gauge fields for ultracold neutral atoms (bosonic and fermionic alkali atoms), analogous to applied fields in condensed matter systems. I will discuss these static gauge fields in the language of spin-orbit coupling where it consists of an equal sum of Rashba and Dresselhaus couplings. In experiment, we couple two internal states of our alkali atoms with a pair of ``Raman'' lasers and load our degenerate quantum gas into the resulting adiabatic eigenstates. For a Bose gas, a function of the Raman laser strength, a new exchange-driven interaction between the two dressed spins develops, which drives a (quantum) phase transition from a state where the two dressed spin states spatially mix, to one where they phase separate. Going beyond this simple modification to the spin-dependent interaction, we show that in the limit of large laser intensity, the particles act as free atoms, but interact with contributions from higher even partial waves.

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                  • The Radon EDM Experiment

                    01:04:08

                    from UK College of Arts & Sciences / Added

                    23 Plays / / 0 Comments

                    Dr. Tim Chupp University of Michigan A permanent electric dipole moment (EDM) of a particle or system would arise due to breaking of time-reversal (T), or equivalently charge-conjugation/parity (CP) symmetry. Over the past five decades, a number of experiments on the neutron, atoms and molecules have only set upper limits on EDMs, and the search continues, motivated in large part by the expectation that beyond Standard-Model physics CP violation is required to explain the baryon asymmetry of the universe. In addition, new techniques and access to systems in which the effects of CP violation would be greatly enhanced are driving the field forward. Systems that may be favorable for significant advances include the isotopes 225Ra and 221/223Rn, where the combination of significant octupole collectivity and relatively closely spaced opposite parity levels would increase the nuclear Schiff moment by orders of magnitude compared to other diamagnetic atoms, i.e. 199Hg. A number of technical and nuclear-structure issues must be addressed in order to assess the prospects for an experiment of significant impact. Among the technical challenges for the Radon-EDM program are developing an on-line EDM experiment at an isotope-production facility that will collect and make measurements on the short-lived species (half lives are approximately 25 min). We have developed and tested a system for high-efficiency collection and spin-exchange polarization of noble-gas isotopes that has been tested at the TRIUMF ISAC facility (experiment S929). Radon polarization techniques were studied at ISOLDE and Stony Brook, and spin-precession detection techniques are under development. Nuclear-structure issues include determining the octupole collectivity as well as the spacing of opposite parity levels. A series of experiments at ISOLDE (IS475 and IS552) have recently directly measured octupole collectivity in 220Rn and 224Ra leading to strengthened confidence in conclusions about the octupole enhancements. Experiments are also underway at NSCL at Michigan State University TRIUMF/ISAC to study the nuclear structure of isotopes in this mass region. I will report on progress on all these fronts and discuss recent developments in our studies of how we learn about the basic physical parameters of CP violation from the suite of EDM measurements.

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