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Nuclear Theory·nucl-th

Tuesday·April 11, 2017

11 papers—8 primary·3 cross-listed

All11Primary8Cross-lists3
  1. 09

    [Submitted on 10 Apr 2017] (cross-list from hep-th)

    General equilibrium second-order hydrodynamic coefficients for free quantum fields

    M. Buzzegoli (U. Florence)🇮🇹 · E. Grossi (U. Heidelberg)🇩🇪 · F. Becattini (U. Florence)🇮🇹

    We present a systematic calculation of the corrections of the stress-energy tensor and currents of the free boson and Dirac fields up to second order in thermal vorticity, which is relevant for relativistic hydrodynamics. These corrections are non-dissipative because they survive at general thermodynamic equilibrium with non vanishing mean values of the conserved generators of the Lorentz group, i.e. angular momenta and boosts. Their equilibrium nature makes it possible to express the relevant coefficients by means of correlators of the angular-momentum and boost operators with stress-energy tensor and current, thus making simpler to determine their so-called "Kubo formulae". We show that, at least for free fields, the corrections are of quantum origin and we study several limiting cases and compare our results with previous calculations. We find that the axial current of the free Dirac field receives corrections proportional to the vorticity independently of the anomalous term.

    Comments:
    33 pages, final version published in JHEP; corrected typos in tables
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1704.02808 [pdf]
    JHEP(2017)·91 citations
  2. 10

    [Submitted on 10 Apr 2017] (cross-list from quant-ph)

    More quantum centrifugal effect in rotating frame

    J.-P. Gazeau🇫🇷 · T. Koide🇧🇷 · R. Murenzi🇫🇷

    The behaviour of quantum systems in non-inertial frames is revisited from the point of view of affine coherent state (ACS) quantization. We restrict our approach to the one-particle dynamics confined in a rotating plane about a fixed axis. This plane is considered as punctured due to the existence of the rotation center, which is viewed as a singularity. The corresponding phase space is the affine group of the plane and the ACS quantization enables us to quantize the system by respecting the affine symmetry of the true phase space. Our formulation predicts the appearance of an additional quantum centrifugal term, besides the usual angular momentum one, which prevents the particle to reach the singular rotation center. Moreover it helps us to understand why two different non-inertial Schrödinger equations are obtained in previous works. The validity of our equation can be confirmed experimentally by observing the harmonic oscillator bound states and the critical angular velocity for their existence.

    Comments:
    5 pages, no figure, references are added
    Subjects:
    Quantum Physics (quant-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1704.02832 [pdf]
    EPL(2017)·5 citations
  3. 11

    [Submitted on 10 Apr 2017] (cross-list from hep-ph)

    Production of doubly charmed baryons nearly at rest

    Stefan Groote🇪🇪 · Sergey Koshkarev🇪🇪

    We investigate the production cross sections, momentum distributions and rapidity distributions for doubly charmed baryons which according to the intrinsic heavy quark mechanism are produced nearly at rest. These events should be measurable at fixed-target experiments like STAR@RHIC and AFTER@LHC.

    Comments:
    5 pages, 4 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1704.02850 [pdf]
    EPJC(2017)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE