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Nuclear Theory·nucl-th

Tuesday·February 24, 2015

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    An effective model for the QCD phase transitions at finite baryon density

    Sanjin Benic🇭🇷 · Igor Mishustin🇩🇪 · Chihiro Sasaki🇩🇪

    We introduce an effective quark-meson-nucleon model for the QCD phase transitions at finite baryon density. The nucleon and the quark degrees of freedom are described within a unified framework of a chiral linear sigma model. The deconfinement transition is modeled through a simple modification of the distribution functions of nucleons and quarks, where an additional auxiliary field, the bag field, is introduced. The bag field plays a key role in converting between the nucleon and the quark degrees of freedom. The model predicts that the chiral and the deconfinement phase transitions are always separated. Depending on the model parameters, the chiral transition occurs in the baryon density range of , while the deconfinement transition occurs above , where is the saturation density.

    ↳ hep-phnucl-thPRD(2015)·62 citations
  2. 07

    Phase structure of two-color QCD at real and imaginary chemical potentials; lattice simulations and model analyses

    Takahiro Makiyama🇯🇵 · Yuji Sakai🇯🇵 · Takuya Saito🇯🇵 · Masahiro Ishii🇯🇵 · Junichi Takahashi🇯🇵 · Kouji Kashiwa🇯🇵 · Hiroaki Kouno🇯🇵 · Atsushi Nakamura🇯🇵 · Masanobu Yahiro🇯🇵

    We investigate the phase structure of two-color QCD at both real and imaginary chemical potentials mu, performing lattice simulations and analyzing the data with the Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. Lattice QCD simulations are done on an 8^3 times 4 lattice with the clover-improved two-flavor Wilson fermion action and the renormalization-group improved Iwasaki gauge action. We test the analytic continuation of physical quantities from imaginary mu to real mu by comparing lattice QCD results calculated at real mu with the result of analytic function the coefficients of which are determined from lattice QCD results at imaginary mu. We also test the validity of the PNJL model by comparing model results with lattice QCD ones. The PNJL model is good in the deconfinement region, but less accurate in the transition and confinement regions. This problem is improved by introducing the baryon degree of freedom to the model. It is also found that the vector-type four-quark interaction is necessary to explain lattice data on the quark number density.

    ↳ hep-lathep-phnucl-thPRD(2016)·24 citations
  3. 08

    Testing Lorentz invariance in orbital electron capture

    K.K. Vos🇳🇱 · H.W. Wilschut🇳🇱 · R.G.E. Timmermans🇳🇱

    Searches for Lorentz violation were recently extended to the weak sector, in particular neutron and nuclear decay [1]. From experiments on forbidden -decay transitions strong limits in the range of - were obtained on Lorentz-violating components of the -boson propagator [2]. In order to improve on these limits strong sources have to be considered. In this Brief Report we study isotopes that undergo orbital electron capture and allow experiments at high decay rates and low dose. We derive the expressions for the Lorentz-violating differential decay rate and discuss the options for competitive experiments and their required precision.

    ↳ hep-phnucl-exnucl-thPRC(2015)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE