UC Davis Particle Physics Seminars 2013

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Goldstone Meets Higgs at the LHC Mar 18, 2013

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After the recent discovery at the LHC of a Higgs-like particle with mass around 125 GeV, it is mandatory to reassess the viability of the proposed solutions to the hierarchy problem of the electroweak scale. In this talk, Javi Serra focuses on compositeness as the fundamental idea, with the Higgs arising as a Goldstone boson of the new strong dynamics and discuss its exciting phenomenological implications, including the prospect of non-minimal scalar sectors and its significance for Higgs couplings.

Effective Theory of a Light Dilaton Mar 11, 2013

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Zackaria Chacko discusses light dilators and how one could mimic the Higgs boson.

The Once and Future Higgs Mar 06, 2013

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Nathaniel Craig discusses general search strategies for new physics in the Higgs sector.

Effective Theory in a Time Dependent World Mar 04, 2013

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Richard Holman describes how to calculate processes in time-dependent effective theories.

Black Holes: Complementarity or Firewalls? Feb 25, 2013

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Joe Polchinksi argues that the following three statements cannot all be true: (i) Hawking radiation is in a pure state, (ii) the information carried by the radiation is emitted from the region near the horizon, with low energy effective field theory valid beyond some microscopic distance from the horizon, and (iii) the infalling observer encounters nothing unusual at the horizon. Perhaps the most conservative resolution is that the infalling observer burns up at the horizon. Alternatives would seem to require novel dynamics that nevertheless cause notable violations of semiclassical physics at macroscopic distances from the horizon.

Hunting Asymmetric Stops Feb 11, 2013

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Jessie Shelton describes how the LHC experiments can probe a model that explains the Tevatron anomaly in the forward-backward top asymmetry.

Time Dependence of Hawking Radiation Entropy Jan 28, 2013

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If a black hole starts in a pure quantum state and evaporates completely by a unitary process, the von Neumann entropy of the Hawking radiation initially increases and then decreases back to zero when the black hole has disappeared. Here numerical results are given for an approximation to the time dependence of the radiation entropy under an assumption of fast scrambling, for large nonrotating black holes that emit essentially only photons and gravitons.

Recent Developments in the Search for Dark Matter Jan 25, 2013

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This lecture offers a careful look at dark matter searches, especially focusing on problems in the DAMA analysis of the annual modulation in the dark matter "signal."

Time Delay in Classical and Quantum Gravity Jan 14, 2013

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A class of diffeomorphism invariant, physical observables (so-called astrometric observables) is introduced. A particularly simple example, the time delay, which expresses the difference between two initially synchronized proper time clocks in relative inertial motion, is analyzed in detail. It is found to satisfy some interesting inequalities related to the causal structure of classical Lorentzian space times. Some potential applications of astrometric observables in quantum gravity are discussed.

Higgs-like Dilatons in Particle Physics Jan 07, 2013

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This lecture discusses how the Goldstone boson of spontaneously broken scale symmetry can mimic the behavior of the Higgs boson.

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