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Nuclear Theory·nucl-th

Wednesday·December 6, 2017

9 papers—7 primary·2 cross-listed

All9Primary7Cross-lists2
  1. 08

    [Submitted on 5 Dec 2017] (cross-list from hep-ph)

    Effects of Renormalizing the chiral SU(2) Quark-Meson-Model

    Andreas Zacchi🇩🇪 · Jürgen Schaffner-Bielich🇩🇪

    We investigate the restoration of chiral symmetry at finite temperature in the SU(2) quark meson model where the mean field approximation is compared to the renormalized version for quarks and mesons. In a combined approach at finite temperature all the renormalized versions show a crossover transition. The inclusion of different renormalization scales leave the order parameter and the mass spectra nearly untouched, but strongly influence the thermodynamics at low temperatures and around the phase transition. We find unphysical results for the renormalized version of mesons and the combined one.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1712.01629 [pdf]
    PRD(2018)·17 citations
  2. 09

    [Submitted on 5 Dec 2017] (cross-list from hep-th)

    A modification of Faddeev-Popov approach free from Gribov ambiguity

    Chong-yao Chen🇨🇳 · Fei Gao🇨🇳 · Yu-xin Liu🇨🇳

    We propose a modified version of the Faddeev-Popov quantization approach for non-Abelian gauge field theory to avoid the Gribov ambiguity. We show that by means of introducing a new method to insert the correct identity into the Yang-Mills generating functional and considering the identity generated by an integral through a subgroup of the gauge group, the problem of the Gribov ambiguity can be removed naturally. Meanwhile by handling the absolute value of the Faddeev-Popov determinant with the method introduced by Williams and collaborators, we lift the Jacobian determinant together with the absolute value and obtain a local Lagrangian. The new Lagrangian have a nilpotent symmetry which can be viewed as an analogue of the BRST symmetry.

    Comments:
    8 pages, no figure, typos corrected
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1712.01710 [pdf]
    Commun.Theor.Phys.(2020)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE