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Nuclear Theory·nucl-th

Thursday·May 24, 2018

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 04

    Thermal corrections to the gluon magnetic Debye mass

    Alejandro Ayala🇲🇽 · Jorge David Castaño-Yepes🇲🇽 · C. A. Dominguez🇿🇦 · S. Hernandez-Ortiz🇲🇽 · L. A. Hernandez🇿🇦 · M. Loewe🇲🇽 · D. Manreza Paret🇲🇽 · R. Zamora🇨🇱

    We compute the gluon polarization tensor in a thermo-magnetic environment in the strong magnetic field limit at zero and high temperature. The magnetic field effects are introduced using Schwinger's proper time method. Thermal effects are computed in the HTL approximation. At zero temperature, we reproduce the well-known result whereby for a non-vanishing quark mass, the polarization tensor reduces to the parallel structure and its coefficient develops an imaginary part corresponding to the threshold for quark-antiquark pair production. This coefficient is infrared finite and simplifies considerably when the quark mass vanishes. Keeping always the field strength as the largest energy scale, in the high temperature regime we analyze two complementary hierarchies of scales: and . In the latter, we show that the polarization tensor is infrared finite as goes to zero. In the former, we discuss the thermal corrections to the magnetic Debye mass.

    ↳ hep-phhep-thnucl-thRev.Mex.Fis.(2020)·26 citations
  2. 05

    Thermo-magnetic evolution of the QCD strong coupling

    Alejandro Ayala🇲🇽 · C. A. Dominguez🇿🇦 · Saul Hernandez-Ortiz🇲🇽 · L. A. Hernandez🇿🇦 · M. Loewe🇲🇽 · D. Manreza Paret🇲🇽 · R. Zamora🇨🇱

    We study the one-loop gluon polarization tensor at zero and finite temperature in the presence of a magnetic field, to extract the thermo-magnetic evolution of the strong coupling . We analyze four distinct regimes, to wit, the small and large field cases, both at zero and at high temperature. From a renormalization group analysis we show that at zero temperature, either for small or large magnetic fields, and for a fixed transferred momentum , grows with the field strength with respect to its vacuum value. However, at high temperature and also for a fixed value of we find two different cases: When the magnetic field is even larger than the squared temperature, also grows with the field strength. On the contrary, when the squared temperature is larger than the magnetic field, a turnover behavior occurs and decreases with the field strength. This thermo-magnetic behavior of can help explain the inverse magnetic catalysis phenomenon found by lattice QCD calculations.

    ↳ hep-phhep-thnucl-thPRD(2018)·87 citations
  3. 06

    Chiral Vortical Effect For An Arbitrary Spin

    Xu-Guang Huang🇨🇳 · Andrey V. Sadofyev🇺🇸

    The spin Hall effect of light attracted enormous attention in the literature due to the ongoing progress in developing of new optically active materials and metamaterials with non-trivial spin-orbit interaction. Recently, it was shown that rotating fermionic systems with relativistic massless spectrum may exhibit a 3d analogue of the spin Hall current -- the chiral vortical effect (CVE). Here we show that CVE is a general feature of massless particles with an arbitrary spin. We derive the semi-classical equations of motion in rotating frame from the first principles and show how by coordinate transformation in the phase space it can be brought to the intuitive form proposed in [1]. Our finding clarifies the superficial discrepancies in different formulations of the chiral kinetic theory for rotating systems. We then generalize the chiral kinetic theory, originally introduced for fermions, to an arbitrary spin and study chirality current in a general rotating chiral medium. We stress that the higher-spin realizations of CVE can be in principle observed in various setups including table-top experiments on quantum optics.

    ↳ hep-thcond-mat.othernucl-thphysics.opticsJHEP(2019)·47 citations
  4. 07

    A Cautionary Tale: The Coulomb Modified ANC for the State in O

    N. Keeley · K.W. Kemper · K. Rusek

    We discuss the impact of the uncertainty ( keV) in the excitation energy of the astrophysically important 6.356 MeV state of O on the precision with which the Coulomb reduced ANC () for the overlap can be extracted from direct reaction data. We find a linear dependence of on the binding energy, the value extracted varying by a factor of 4 over the range -- MeV. This represents an intrinsic limit on the precision with which can be determined which cannot be improved unless or until the uncertainty in is reduced.

    ↳ nucl-exnucl-thEPJA(2018)·5 citations
  5. 08

    Bose enhancement, the Liouville effective action and the high multiplicity tail in p-A collisions

    Alex Kovner🇺🇸 · Vladimir V. Skokov🇺🇸

    In the framework of dense-dilute CGC approach we study fluctuations in the multiplicity of produced particles in p-A collisions. We show that the leading effect that drives the fluctuations is the Bose enhancement of gluons in the proton wave function. We explicitly calculate the moment generating function that resums the effects of Bose enhancement. We show that it can be understood in terms of the Liouville effective action for the composite field which is identified with the fluctuating density, or saturation momentum of the proton. The resulting probability distribution turns out to be very close to the gamma-distribution. We also calculate the first correction to this distribution which is due to pairwise Hanbury Brown-Twiss correlations of produced gluons.

    ↳ hep-phnucl-thPRD(2018)·18 citations

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first authorsco-authorsvia INSPIRE