Linear sigma model at finite baryonic density and symmetry breakings
AUTOR(ES)
Braghin, F. L.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2007-03
RESUMO
The linear sigma model at finite baryonic density with a massive vector field is investigated considering that all the bosonic fields develop non zero expected classical values, eventually associated with condensates and corresponding to dynamical symmetry breakings which might occur in the QCD phase diagram. A modified equation for the classical vector field is proposed with its respective solution. Some in medium properties of the model (mainly masses) are investigated within reasonable prescriptions. In particular the behavior of the in medium pion and sigma masses and a particular way of calculating in medium coupling to baryons is investigated. A symmetry radius for finite baryonic densities is proposed and calculated in different ways in terms of the other variables of the model and these different ways of calculating it agree quite well. However, assuming that the pion and sigma masses go to zero close to the restoration of chiral symmetry a too high value for the critical density is obtained rhoc @ 4.3 rho0.
Documentos Relacionados
- The 2d gross-neveu model at finite temperature and density with finite N corrections
- Different symmetry realizations in relativistic coupled bose systems at finite temperature and densities
- A time-domain finite element model reduction method for viscoelastic linear and nonlinear systems
- Confinement in the 3-dimensional Gross-Neveu model at finite temperature
- Linear and non-linear finite element analysis of shear-corrected composites box beams