1. Nuclear Physics & RIKEN Theory Seminar

    "From the QCD flux tube to the integrable theory of quantum gravity and back"

    Presented by Sergey Dubovskiy, NYU, Physics Department

    Friday, June 14, 2013, 2 pm
    Small Seminar Room, Bldg. 510

    Hosted by: Vladimir Skokov

    We propose a new approach for the calculation of the spectrum of excitations of QCD flux tubes. It relies on the fact that the worldsheet theory is integrable at low energies. The corresponding integrable model features a number of surprising properties characteristic for gravity rather than for conventional field theory. These include the absence of local off-shell observables, a minimal length, a maximum achievable (Hagedorn) temperature, as well as black hole precursors. It exhibits a new type of renormalization group flow behavior, "asymptotic fragility". With this approach, energy levels can be calculated for much shorter flux tubes than was previously possible, allowing for a quantitative comparison with existing lattice data. The improved theoretical control makes it manifest that existing lattice data provides strong evidence for a new pseudoscalar particle localized on the QCD fluxtube - the worldsheet axion.