Quantum fluctuations of the quark condensate
arXiv:hep-ph/0003201 · doi:10.1016/S0375-9474(00)00516-9
Abstract
The quantum fluctuations of the quark condensate are studied in a Nambu Jona-Lasinio model. Two Lorenz invariant regularizations are considered: a sharp 4-momentum cut-off and a soft gaussian regulator. The quantum fluctuations of the quark condensate are found to be large although chiral symmetry is not restored. Instabilities of the ground state appear when the system is probed by a source term proportional to the squared quark condensate. The instabilities are traced to unphysical poles introduced by the regulator and their effect is greatly enhanced when a sharp cut-off is used.
latex potpot.tex, 11 files, 31 pages [SPhT-T00/040], submitted to Nucl. Phys. A
References in corpus (1)
Cited by in corpus (15)
- On covariant nonlocal chiral quark models with separable interactions
- Light pseudoscalar mesons in a nonlocal SU(3) chiral quark model
- Nonlocal chiral quark models with wavefunction renormalization: sigma properties and π-πscattering parameters
- Chiral quark models with non-local separable interactions at finite temperature and chemical potential
- Phase diagram of neutral quark matter in nonlocal chiral quark models
- Characteristics of the chiral phase transition in nonlocal quark models
- Mesonic fluctuations in a nonlocal Nambu-Jona-Lasinio model
- What Does Low Energy Physics Tell Us About The Zero Momentum Gluon Propagator
- Approximating chiral quark models with linear sigma-models
- Two regularizations - two different models of Nambu-Jona-Lasinio
- Renormalization Group Flow in large N_c
- Mean-field expansion and meson effects in chiral condensate of analytically regularized Nambu -- Jona-Lasinio model
- Finite-Momentum Instability of Dynamical Axion Insulator
- Pionic dressing of baryons in chiral quark models
- The Mesonic Fluctuations and Corrections in the Chiral Symmetry Breaking Vacuum