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Nuclear Theory·nucl-th

Thursday·March 14, 2019

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    [Submitted on 13 Mar 2019] (cross-list from hep-th)

    Extensivity, entropy current, area law and Unruh effect

    F. Becattini🇮🇹 · D. Rindori (Florence U.)🇮🇹

    We present a general method to determine the entropy current of relativistic matter at local thermodynamic equilibrium in quantum statistical mechanics. Provided that the local equilibrium operator is bounded from below and its lowest lying eigenvector is non-degenerate, it is proved that, in general, the logarithm of the partition function is extensive, meaning that it can be expressed as the integral over a 3D space-like hypersurface of a vector current, and that an entropy current exists. We work out a specific calculation for a non-trivial case of global thermodynamic equilibrium, namely a system with constant comoving acceleration, whose limiting temperature is the Unruh temperature. We show that the integral of the entropy current in the right Rindler wedge is the entanglement entropy.

    Comments:
    12 pages, 1 figure. Published version in Phys Rev D
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1903.05422 [pdf]
    PRD(2019)·31 citations
  2. 08

    [Submitted on 13 Mar 2019] (cross-list from cond-mat.quant-gas)

    More on the universal equation for Efimov states

    M. Gattobigio🇫🇷 · M. Göbel🇩🇪 · H.-W. Hammer🇩🇪 · A. Kievsky🇮🇹

    Efimov states are a sequence of shallow three-body bound states that arise when the two-body scattering length is much larger than the range of the interaction. The binding energies of these states are described as a function of the scattering length and one three-body parameter by a transcendental equation involving a universal function of one angular variable. We provide an accurate and convenient parametrization of this function. Moreover, we discuss the effective treatment of range corrections in the universal equation and compare with a strictly perturbative scheme.

    Comments:
    13 pages, 5 figures
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    1903.05493 [pdf]
    Few Body Syst.(2019)·14 citations
  3. 09

    [Submitted on 13 Mar 2019] (cross-list from nucl-ex)

    High Precision Measurement of Compton Scattering in the 5 GeV region

    P. Ambrozewicz🇺🇸 · L. Ye🇺🇸 · Y. Prok🇺🇸 · I. Larin🇷🇺 · A. Ahmidouch🇺🇸 · K. Baker🇺🇸 · V. Baturin🇺🇸 · L. Benton🇺🇸 · A. Bernstein🇺🇸 · V. Burkert🇺🇸 · E. Clinton🇺🇸 · P.L. Cole🇺🇸 and 85 other authors

    The cross section of atomic electron Compton scattering was measured in the 4.40--5.475 GeV photon beam energy region by the {\em PrimEx} collaboration at Jefferson Lab with an accuracy of 2\% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1903.05529 [pdf]
    PLB(2019)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE