1. Djordje Minic

    28:37

    from UK College of Arts & Sciences / Added

    32 Plays / / 0 Comments

    Djordje Minic presenting at Great Lakes Strings 2013.

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    • Emil Martinec

      31:56

      from UK College of Arts & Sciences / Added

      11 Plays / / 0 Comments

      Emil Martinec presenting at Great Lakes String 2013

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      • Explaining the Global Warming Theory

        40:50

        from UK College of Arts & Sciences / Added

        25 Plays / / 0 Comments

        Dr. Joseph P. Straley University of Kentucky Explaining the implications of science to contemporary public issues is an important part of our job. As an example I will give an introduction to the global warming issue.

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        • 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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          • From Voids to Clusters: Gas and Galaxy Evolution in the Local Universe

            01:32:01

            from UK College of Arts & Sciences / Added

            35 Plays / / 0 Comments

            Our understanding of the formation and evolution of galaxies and their large scale structure has advanced enormously over the last decade, thanks to an impressive synergy between theoretical and observational efforts. While the growth of the dark matter component seems well understood, the physics of the gas, during its accretion, removal and/or depletion is less well understood. Increasingly large scale optical surveys are tracing out the cosmic web of filaments and voids. Mathematical tools have been developed to describe these structures and to identify galaxies located in specific environments. HI imaging surveys begin to answer the question: how do galaxies get and lose their gas? The best evidence for ongoing gas accretion is found in the lowest density environments, while removal of gas in the highest density environments stops star formation and reddens the galaxies. Speaker: Jacquiline van Gorkom, Columbia University

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            • From Voids to Clusters: Gas and Galaxy Evolution in the Local Universe - 12 Oct. 2012

              01:32:01

              from UK College of Arts & Sciences / Added

              36 Plays / / 0 Comments

              Our understanding of the formation and evolution of galaxies and their large scale structure has advanced enormously over the last decade, thanks to an impressive synergy between theoretical and observational efforts. While the growth of the dark matter component seems well understood, the physics of the gas, during its accretion, removal and/or depletion is less well understood. Increasingly large scale optical surveys are tracing out the cosmic web of filaments and voids. Mathematical tools have been developed to describe these structures and to identify galaxies located in specific environments. HI imaging surveys begin to answer the question: how do galaxies get and lose their gas? The best evidence for ongoing gas accretion is found in the lowest density environments, while removal of gas in the highest density environments stops star formation and reddens the galaxies. Speaker: Jacquiline van Gorkom, Columbia University

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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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                • 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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                  • George Siopsis

                    25:14

                    from UK College of Arts & Sciences / Added

                    9 Plays / / 0 Comments

                    George Siopsis

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                    • Gino Knodel

                      10:56

                      from UK College of Arts & Sciences / Added

                      52 Plays / / 0 Comments

                      Gino Knodel presenting at Great Lakes String 2013

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