Graduate Student Lunch Club Fall 2017

When & Where

The CTP Lunch Club meets at 12noon in the CTP Cosman seminar room every Friday (provided that there are sufficient speakers). A light lunch will be provided (usually pizza, however some other options may be explored).

About the Seminar

The seminars are designed for graduate students and should be accessible to all students. First year students are particularly encouraged to attend so that they may learn about research being performed in the CTP.

Email notification of the club will be sent to the ctp-all, ctp-postdocs and ctp-students email lists as appropriate. If you wish to speak, or have suggestions about speakers and/or possible workshop topics, please contact the organizers: Sarah Geller, Yu-Chien Huang and Vita Gherardo.

  • September 27, 12pm
    Nima Lashkari

    Relative Modular Operator

    I review the definition of the relative modular operator, discuss its properties, work out a few examples and argue why thinking in terms of this operator in the recent years has led to proving long-standing conjectured inequalities in quantum field theory.

  • November 3, 12pm
    Gherardo Vita

    Fermionic Glauber Operators and Quark Reggeization

  • November 17, 12pm
    Andrew Turner

    Anomaly constraints and U(1) charges for 6D N = 1 supergravity theories

    We analyze the anomaly constraints on 6D supergravity theories with a single abelian U(1) gauge factor. For theories with charges restricted to q = 1,2, the possible spectra are strongly constrained by the anomaly conditions; for theories without tensor multiplets, such anomaly-free models precisely match those models that can be realized from F-theory compactifications, and for theories with tensor multiplets F-theory suggests some simple additional UV constraints. For theories with larger charges, the anomaly constraints are less stringent. We identify an infinite class of distinct massless charge spectra that appear to be in the “swampland” of theories that satisfy all known quantum consistency conditions but do not admit a realization through F-theory or any other known approach to string compactification. We also compare the spectra of charged matter in abelian theories with those that can be realized from breaking nonabelian SU(2) and higher-rank gauge symmetries.

  • December 8
    Michael Wagman

    Lattice QCD, Nuclei, and the Sign Problem

    Lattice QCD calculations are presently exploring the structure and reactions of light nuclei in universes where the up and down quarks are heavier than in nature. Recent calculations of baryons in boxes with background fields have uncovered emergent symmetries of baryon-baryon scattering at heavier quark masses and determined reaction rates relevant for nuclear astrophysics and new physics searches such as neutrinoless double-beta decay. Lattice QCD calculations of larger nuclei at lighter quark masses face an exponentially difficult signal-to-noise problem related to a sign problem facing path integrals of complex observables. I'll discuss ongoing work to mitigate the baryon signal-to-noise problem by exploiting statistical random walk behavior in the phases of complex path integrals.

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