Spring 2013 Seminar Series

Organizer: Dietrich Belitz

Seminars are at 4pm, Tuesdays, in 472 Willamette Hall and are preceded by cookies at 3:45.

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January 22 The Origin of Magic Numbers
Nader Ghahramany
Shiraz University

April 9, 2013 Ridges and Correlations in Hot, Dense Matter
Rudy Hwa
University of Oregon, Physics

A general talk about the overview of how to understand the properties of the hottest and densest matter ever created on earth at RHIC and LHC. To convey the physical ideas I will use more cartoons than equations in the presentation.
April 16, 2013 Higgs Self-Coupling Measurement at the LHC Using Ratios of Cross-Sections
Jose Zurita
Johannes-Gutenberg University Mainz

We consider the ratio of cross sections of double-to-single Higgs boson production at the LHC at 14 TeV. Since both processes possess similar higher-order corrections (leading to a cancellation of uncertainties in the ratio), this observable is well-suited to constrain the trilinear Higgs boson self-coupling. We consider the scale variation, parton density function uncertainties and conservative estimates of experimental uncertainties to construct expected exclusion regions. We show that the trilinear self-coupling can be constrained to be positive with a 600 /fb LHC dataset at 95% confidence level. We expect to obtain a +30% and −20% uncertainty on the self-coupling at 3000 /fb without statistical fitting of differential distributions. This is the most precise method to determination the Higgs trilinear self-coupling to date.
Spencer Chang
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April 30, 2013 Solving the Relativistic Inverse Stellar Structure Problem
Lee Lindblom
CalTech

Abstract: The inverse stellar structure problem determines the equation of state of the stellar matter from a knowledge of the stars' observable macroscopic properties, like their masses and radii. This seminar will discuss different approaches to solving this problem, including some new results based on spectral methods. A new version of the problem will also be presented that uses the masses and tidal deformabilities of neutron stars as the observables (which should be soon measurable with gravitational wave observations).
Jim Isenberg
May 7, 2013 Isenberg: What We Know and What We Want to Know about Initial Data for Einstein’s Gravitational Field Theory
Chang: Higgs and New Physics
Jim Isenberg and Spencer Chang
University of Oregon, Mathematics and Physics

Chang: This short talk will try to explain what the Higgs is, why it is such a monumental discovery, and what we can learn with future data. It will also serve as an open-ended Question and Answer session on anything you want to know about the Higgs.
May 14, 2013 Thought Provoking? (or Just Provoking?)
Marina Guenza
University of Oregon, Chemistry

Do polymer chains in a polymeric liquid "reptate" like snakes? Most of the polymer physics community believe so. But still there are some questions, emerging from experimental data, which snake-like behavior cannot answer. What if we model polymer liquids as "complex" molecular liquids? Is it possible to make some progress following this new direction?
May 21, 2013 Many-body Localization and Dynamical Quantum Phase Transitions in Random Systems
Ehud Altman
Weismann Institute

The time evolution of a closed quantum system, starting from natural initial states, is usually expected to attain thermal equilibrium. If so, any singularities in the long time dynamics should be directly related to thermodynamic transitions in the attained equilibrium. But strongly disordered systems may behave differently due to many-body localization, which prevents thermalization even at long times. What is then the nature of the truly dynamical transitions in quantum random systems? We elucidate this question using a real space renormalization group approach formulated to describe the time evolution of random quantum systems. Using the same approach we also explain the striking universal features and ultra-slow (logarithmic) growth of the entanglement entropy seen in recent numerical simulations of such systems. Finally, we demonstrate with a specific model how many-body localization can preserve and allow observation of topologically protected edge states in quantum systems prepared at high energy density.
John Toner
May 28, 2013 Potential Gradients Produced by Pore-Space Heterogeneities: Applications to Isothermal Frost Damage and Submarine Hydrate Anomalies
Alan Rempel
University of Oregon, Geology

June 4, 2013 Gilkey: Heat Content Asymptotics without Boundary
Boris: TBA
Peter Gilkey and Boris Botvinnik
University of Oregon, Mathematics

Gilkey: The nature of the dark sector is one of the most important questions to be addressed by current astro- and particle physics experiments. I will review how the confluence of data sheds light on the properties of dark matter, from its particle interactions to its distribution in the sky. I will then discuss our recent theoretical work suggesting the presence of more substructure in the local halo than previously expected. These results have important implications for direct detection experiments and offer the possibility of mapping out local dark matter structure using low-metallicity stars in the stellar halo.
Last modified: Fr Aug 27 17:54:31 PDT 2010
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