HIGH ENERGY SEMINARS
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The High Energy Seminars are in Room 2165 NPB on Tuesdays & Fridays @ 2:00pm
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| NOVEMBER 17 or 20 | ||
| Speaker | TBA | |
| Title | ||
| Abstract | ||
| NOVEMBER 13 (FRI) | ||
| Speaker | Pierre Ramond UF Physics | |
| Title | Superconformal Theories | |
| Abstract | A tutorial on the light cone representations of superconformal theories. Part I | |
| NOVEMBER 10 (TUE) | ||
| Speaker | Hirotaka Sugawara JSPS | |
| Title | Photon-photon collider as a precursor to ILC | |
| Abstract | I propose a photon-photon collider as a precursor to ILC. The latter aims at the energy of 500GeV e+e- collder which costs at least $6B. The former is about a half of it if Higgs is below something like 150Gev. I argue that Higgs seems to be less than 140 Gev at least within reasonable theoretical framework and the only way to produce single Higgs is this technology. | |
| NOVEMBER 6 (FRI) | ||
| Speaker | Dmitry Belyaev UF Physics | |
| Title | Maximal Supersymmetry in Light-Cone Superspace | |
| Abstract | Maximally supersymmetric theories arise naturally as limits of the string/M-theory. Amazingly enough, they can all be described by a single constrained (on-shell) superfield living in light-cone superspace. When the theory is also (super)conformal, it is completely determined by the (dynamical) supersymmetry transformation of the light-cone superfield. I will describe how one finds this key ingredient in the d=4 N=4 super-Yang-Mills theory and in the d=3 N=8 Bagger-Lambert-Gustavsson theory. | |
| OCTOBER 30 (FRI) | ||
| Speaker | Rick Field UF Physics | |
| Title | Physics Opportunities with Early LHC Data (Part II) | |
| Abstract | I will explain some of what we have learned from studies of "min-bias" collisions and the "underlying event" in high transverse momentum jet production and in Z-boson production at the Tevatron. I will make predictions of what "min-bias" and the "underlying event" will look like at 7 TeV, 10 TeV, and 14 TeV and discuss the reliability of the LHC predictions. In addition, I will examine some of the physics opportunities at the LHC next year. | |
| OCTOBER 27 (TUE) | ||
| Speaker | Rick Field UF Physics | |
| Title | Physics Opportunities with Early LHC Data (Part I) | |
| Abstract | I will explain some of what we have learned from studies of "min-bias" collisions and the "underlying event" in high transverse momentum jet production and in Z-boson production at the Tevatron. I will make predictions of what "min-bias" and the "underlying event" will look like at 7 TeV, 10 TeV, and 14 TeV and discuss the reliability of the LHC predictions. In addition, I will examine some of the physics opportunities at the LHC next year. | |
| OCTOBER 23 (FRI) | ||
| Speaker | Celine Boehm Annecy, LAPTH | |
| Title | How close are we to solving the dark matter issue? | |
| Abstract | Recently, there has been a lot of excitement in the dark matter community. New dark matter models have been proposed to explain the so-called PAMELA positron excess or the 511 keV line while more conventional candidates (such as neutralinos) are being constrained. I will review some of the recent possibilities that have been proposed in the literature and discuss experimental signatures that could help to elucidate the dark matter puzzle. | |
| OCTOBER 20 (TUE) | ||
| Speaker | Sung-Soo Kim Brussels (ULB) | |
| Title | Horava-Lifshitz Gravity and Surplus Angles | |
| Abstract | In this talk, I will give a brief review on Horava-Lifshitz (HL) gravity and consider electrostatic field of a point charge coupled to HL gravity. I will show that its solution allows a surplus angle which is not natural in general relativity, and discuss the effect of surplus angles. | |
| OCTOBER 13 (TUE) | ||
| Speaker | TBA | |
| Title | ||
| Abstract | ||
| OCTOBER 9 (FRI) | ||
| Speaker | Pierre Sikivie UF Physics | |
| Title | Bose-Einstein Condensation of Dark Matter Axions | |
| Abstract | It was found recently that dark matter axions thermalize and form a Bose-Einstein condensate (BEC). Because they form a BEC, axions differ from ordinary cold dark matter (CDM) in the non-linear regime of structure formation and upon entering the horizon. Axion BEC provides a mechanism for the production of net overall rotation in dark matter halos, and for the alignment of cosmic microwave anisotropy multipoles. Because there is evidence for these phenomena, unexplained with ordinary CDM, it is argued that the dark matter is axions. | |
| SEPTEMBER 29 (TUE) -- Special colloquium in Room 2205 NPB at 4:05 p.m. | ||
| Speaker | Graham Farmelo Northeastern | |
| Title | Paul Dirac and the religion of mathematical beauty | |
| Abstract | ||
| SEPTEMBER 22 (TUE) | ||
| Speaker | Dimitri Bourilkov UF Physics | |
| Title | High Energy Muons in CMS: from Simulations to Data | |
| Abstract | The CMS experiment at LHC is ready for first collisions and exploration of the Terascale. I will present studies with high energy muons in preparation for first physics. Topics include simulation of TeV muons, efficiency and resolution studies, high mass di-muon pairs (the Drell-Yan channel) as test of the Standard Model at highest momentum transfers and searches for new phenomena like compositeness or extra dimensions. In addition I will present results from the analysis of real data taken in-situ during tests with cosmic muons. These studies deepen the understanding of the efficiency and resolution of the CMS detector with real data and extend the knowledge of cosmic muons to the TeV region. They can bring new insights at the intersection between cosmic rays and particle physics. | |
| SEPTEMBER 18 (FRI) | ||
| Speaker | Howard Georgi Harvard | |
| Title | Unparticle stuff in the Sommerfield model | |
| Abstract | Scale and conformal invariant field theories are beautiful but strange. Unparticle physics provides a way to think about these peculiar objects in a more physical way, which will be important if such things actually exist in our world. I will discuss some issues related to nontrivial interactions of unparticle stuff, and illustrate some of the ideas in a 1+1 dimensional QFT. There won't be any actual phenomenology in the talk, but I hope that some of the QFT will be interesting. | |
| SEPTEMBER 8 (TUE) | ||
| Speaker | Sergey Klimenko UF Physics | |
| Title | Detection and reconstruction of gravitational waves with network of interferometric detectors. | |
| Abstract | Currently there are several gravitational wave (GW) detectors operating around the world. We believe that such a network of detectors will allow us a confident detection of gravitational waves in the nearest future opening a new era of the GW astronomy. I will present the most recent results and describe how the experimental data is analyzed, and how the GW signals can be reconstructed, which is critical for extraction of astrophysical information about the GW sources. If detected, can we reconstruct GW signals? How many detectors we need? How we combine measurements from different detectors? What interesting astrophysical measurements can we perform? I will discuss these and other questions related to the GW data analysis and the GW astronomy. | |
| SEPTEMBER 4 (FRI) | ||
| Speaker | Shun-Pei Miao Utrecht U. and CECS | |
| Title | Is Weinberg's Theorem Violated? | |
| Abstract | In hep-th/0605244 Steven Weinberg established a bound on the fastest possible growth of quantum corrections to the primordial power spectrum from gravity, the inflaton or any number of additional scalar fields. The bound is that quantum corrections cannot grow faster than some power of the logarithm of the scale factor. In gr-qc/0608002, Wu, Ng and Ford computed the correction to the power spectrum from a conformally coupled scalar and got a result which seems to grow like the square of the scale factor. This is puzzling for two reasons: (1) It seems to violate Weinberg's bound; and (2) It is coming from precisely the sector --- conformal matter --- which ought to be quiescent during inflation. Based on work with Wu, Ng and Ford, I show how there is in fact no violation either of Weinberg's bound, or of our expectation that conformal matter is irrelevant during inflation. I close with an explicit example of a more general theory --- not covered by Weinberg's theorem --- in which quantum corrections are so large that they actually dominate late time cosmology. This raises the interesting question of defining the general circumstances under which quantum corrections to the power spectrum can be large. | |