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Nuclear Theory·nucl-th

Tuesday·March 20, 2018

12 papers—9 primary·3 cross-listed

All12Primary9Cross-lists3
  1. 10

    [Submitted on 7 Mar 2018] (cross-list from cond-mat.quant-gas)

    Dynamics of first-order quantum phase transitions in extended Bose-Hubbard model: From density wave to superfluid and vice-versa

    Keita Shimizu · Takahiro Hirano · Jonghoon Park · Yoshihito Kuno · Ikuo Ichinose

    In this paper, we study the nonequilibrium dynamics of the Bose-Hubbard model with the nearest-neighbor repulsion by using time-dependent Gutzwiller (GW) methods. In particular, we vary the hopping parameters in the Hamiltonian as a function of time, and investigate the dynamics of the system from the density wave (DW) to the superfluid (SF) crossing a first-order phase transition and vice-versa. From the DW to SF, we find scaling laws for the correlation length and vortex density with respect to the quench time. This is a reminiscence of the Kibble-Zurek scaling for continuous phase transitions and contradicts the common expectation. We give a possible explanation for this observation. On the other hand from the SF to DW, the system evolution depends on the initial SF state. When the initial state is the ground-state obtained by the static GW methods, a coexisting state of the SF and DW domains forms after passing through the critical point. Coherence of the SF order parameter is lost as the system evolves. This is a phenomenon similar to the glass transition in classical systems. When the state starts from the SF with small local phase fluctuations, the system obtains a large-size DW-domain structure with thin domain walls.

    Comments:
    21 pages, 13 figures, Version to appear in New J. Phys, typos corrected
    Subjects:
    Quantum Gases (cond-mat.quant-gas); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1803.02548 [pdf]
    New J.Phys.(2018)·17 citations
  2. 11

    [Submitted on 16 Mar 2018] (cross-list from nucl-ex)

    Exclusive vector meson production at an electron-ion collider

    Michael Lomnitz🇺🇸 · Spencer Klein🇺🇸

    Coherent exclusive vector meson electroproduction is a key physics channel at an electron-ion collider. It probes the gluon structure of nuclei over a wide range of , and can be used to measure nuclear shadowing and to search for gluon saturation and/or the colored glass condensate. In this paper, we present calculations of the kinematic distributions for a variety of exclusive vector meson final states: the , , J/, and the states. The cross-sections for light and mesons are large, while states should be produced in moderate numbers at a medium energy EIC (the proposed U.S. designs) and in large numbers at the LHeC. We investigate the acceptances for these states, as a function of detector rapidity coverage. A large-acceptance detector is needed to cover the full range photon-nucleon collision energies produced at an EIC; a forward detector is required to observe vector mesons from the most energetic photon interactions, and thereby probe gluons at the lowest possible Bjorken- values.

    Comments:
    12 pages, 12 figures and 4 tables
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1803.06420 [pdf]
    PRC(2019)·53 citations
  3. 12

    [Submitted on 19 Mar 2018] (cross-list from hep-ph)

    A novel Dual Chiral Density Wave in nuclear matter based on a parity doublet structure

    Yusuke Takeda🇯🇵 · Hiroaki Abuki🇯🇵 · Masayasu Harada🇯🇵

    We study the Dual Chiral Density Wave (DCDW) in nuclear matter using a hadronic model with the parity doublet structure. We first extend the ordinary DCDW ansatz so as to incorporate the effect of an explicit chiral symmetry breaking. Then via numerically evaluating and minimizing the effective potential, we determine the phase structure. We find, in addition to the ordinary DCDW phase where the space average of the chiral condensate vanishes, a new DCDW phase (sDCDW) with a nonvanishing space average depending on the value of the chiral invariant mass parameter.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1803.06779 [pdf]
    PRD(2018)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE