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Nuclear Theory·nucl-th

Friday·May 25, 2018

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 03

    [Submitted on 23 May 2018] (cross-list from cond-mat.mes-hall)

    Tunable Symmetry in Noisy Graphene

    E. Frade Silva · A. L. R. Barbosa · M. S. Hussein · J. G. G. S. Ramos

    We investigate the resonant regime of a mesoscopic cavity made of graphene or a doped beam splitter. Using Non-Hermitian Quantum Mechanics, we consider the Bender-Boettcher assumption that a system must obey parity and time reversal symmetry. Therefore, we describe such system by coupling chirality, parity and time reversal symmetries through the scattering matrix formalism and apply it in the shot noise functions, also derived here. Finally we show how to achieve the resonant regime only by setting properly the parameters concerning the chirality and the PT symmetry.

    Comments:
    8 pages, 7 figures
    Subjects:
    Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1805.09117 [pdf]
    0 citations
  2. 04

    [Submitted on 23 May 2018] (cross-list from hep-th)

    Lectures on non-equilibrium effective field theories and fluctuating hydrodynamics

    Paolo Glorioso🇺🇸 · Hong Liu🇺🇸

    We review recent progress in developing effective field theories (EFTs) for non-equilibrium processes at finite temperature, including a new formulation of fluctuating hydrodynamics, and a new proof of the second law of thermodynamics. There are a number of new elements in formulating EFTs for such systems. Firstly, the nature of IR variables is very different from those of a system in equilibrium or near the vacuum. Secondly, while all static properties of an equilibrium system can in principle be extracted from the partition function, there appears no such quantity which can capture all non-equilibrium properties. Thirdly, non-equilibrium processes often involve dissipation, which is notoriously difficult to deal with using an action principle. The purpose of the review is to explain how to address these issues in a pedagogic manner, with fluctuating hydrodynamics as a main example.

    Comments:
    36 pages, 4 figures
    Subjects:
    High Energy Physics — Theory (hep-th); Statistical Mechanics (cond-mat.stat-mech); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1805.09331 [pdf]
    PoS(2018)·266 citations
  3. 05

    [Submitted on 23 May 2018] (cross-list from hep-ph)

    Hierarchy of azimuthal anisotropy harmonics in collisions of small systems from the Color Glass Condensate

    Mark Mace🇺🇸 · Vladimir V. Skokov🇺🇸 · Prithwish Tribedy🇺🇸 · Raju Venugopalan🇺🇸

    We demonstrate that the striking systematics of two-particle azimuthal Fourier harmonics and in ultrarelativistic collisions of protons, deuterons and helium-3 ions off gold nuclei measured by the PHENIX Collaboration [arXiv:1805.02973] at the Relativistic Heavy Ion Collider (RHIC) is reproduced in the Color Glass Condensate (CGC) effective field theory. This contradicts the claim in [arXiv:1805.02973] that their data rules out initial state based explanations. The underlying systematics of the effect, as discussed previously in [arXiv:1705.00745,arXiv:1706.06260,arXiv:1801.09704], arise from the differing structure of strong color correlations between gluon domains of size at fine () or coarser () transverse momentum resolution. Further tests of the limits of validity of this framework can be carried out in light-heavy ion collisions at both RHIC and the Large Hadron Collider. Such measurements also offer novel opportunities for further exploration of the role of the surprisingly large short-range nuclear correlations measured at Jefferson Lab.

    Comments:
    6 pages, 4 figures. v2: minor changes, version published in PRL
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1805.09342 [pdf]
    PRL(2018)·113 citations
  4. 06

    [Submitted on 24 May 2018] (cross-list from astro-ph.HE)

    Properties of Massive Rotating Protoneutron Stars with Hyperons: Structure and Universality

    Smruti Smita Lenka🇮🇳 · Prasanta Char🇮🇳 · Sarmistha Banik🇮🇳

    In this work, we study the properties and structure of a massive and rapidly rotating protoneutron star (PNS) with hyperon content. We follow several stages of quasi-stationary evolution in an approximate way at four discrete steps. We use a density-dependent (DD) relativistic mean field theory (RMF) model and calculate different quantities such as mass, equatorial radius, moment of inertia, and quadrupole moment to get different rotating configurations upto the mass-shedding limit. We study the effect of the appearance of , the lightest of all hyperons, on each of the evolutionary stages of the PNS. We also check its sensitivity to the inclusion of vector meson as a mediator of interaction in detail. Finally, we investigate the universal relations between moment of inertia and compactness in the context of a hot and young compact object.

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    1805.09492 [pdf]
    J.Phys.G(2019)·27 citations
  5. 07

    [Submitted on 24 May 2018] (cross-list from hep-ph)

    Magnetic moments of the spin- singly heavy baryons

    Lu Meng🇨🇳 · Guang-Juan Wang🇨🇳 · Chang-Zhi Leng🇨🇳 · Zhan-Wei Liu🇨🇳 · Shi-Lin Zhu🇨🇳

    We calculate the magnetic moments of spin- singly charmed baryons in the heavy baryon chiral perturbation theory (HBChPT). The analytical expressions are given up to . The heavy quark symmetry is used to reduce the number of low energy constants (LECs). With the lattice QCD simulation data as the magnetic moments of the charmed baryons, the numerical results are given up to in three scenarios. In the first scenario, we use the results in the quark model as the leading order input. In the second scenario, we use the heavy quark symmetry and neglect the contribution of heavy quark. In the third scenario, the heavy quark contribution is considered on the basis of the scenario II and the magnetic moments of singly bottom baryons are given as a by-product.

    Comments:
    18 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1805.09580 [pdf]
    PRD(2018)·24 citations
  6. 08

    [Submitted on 23 May 2018] (cross-list from cond-mat.str-el)

    Correlational latent heat by nonlocal quantum kinetic theory

    K. Morawetz

    The kinetic equation of nonlocal and non-instantaneous character unifies the achievements of the transport in dense quantum gases with the Landau theory of quasiclassical transport in Fermi systems. Large cancellations in the off-shell motion appear which are hidden usually in non-Markovian behaviors. The remaining corrections are expressed in terms of shifts in space and time that characterize the non-locality of the scattering process. In this way quantum transport is possible to recast into a quasi-classical picture. The balance equations for the density, momentum, energy and entropy include besides quasiparticle also the correlated two-particle contributions beyond the Landau theory. The medium effects on binary collisions are shown to mediate the latent heat, i.e., an energy conversion between correlation and thermal energy. For Maxwellian particles with time-dependent s-wave scattering, the correlated parts of the observables are calculated and a sign change of the latent heat is reported at a universal ratio of scattering length to the thermal De Broglie wavelength. This is interpreted as a change from correlational heating to cooling.

    Comments:
    6 pages letter, 1 figure. arXiv admin note: text overlap with arXiv:1708.05602
    Subjects:
    Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1805.09683 [pdf]
    PRB(2018)·5 citations
  7. 09

    [Submitted on 24 May 2018] (cross-list from hep-ph)

    Quarkonium radiative decays from the hadronic Paschen-Back effect

    Sachio Iwasaki🇯🇵 · Kei Suzuki🇯🇵

    We study the radiative (E1 and M1) decays of P-wave quarkonia in a strong magnetic field based on the Lagrangian of potential nonrelativistic QCD. To investigate their properties, we implement a polarized wave function basis justified in the Paschen-Back limit. In a magnetic field stronger than the spin-orbit coupling, the wave functions of the P-wave quarkonia are drastically deformed by the Hadronic Paschen-Back effect. Such deformation leads to the anisotropy of the direction of decays from the P-wave quarkonia. The analytic formulas for the radiative decay widths in the nonrelativistic limit are shown, and the qualitative decay properties are discussed.

    Comments:
    11 pages, 1 figure, 5 tables; published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1805.09787 [pdf]
    PRD(2018)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE