Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
105 pages, 22 figures, main part of my Ph.D. thesis
Scientific paper
After a brief introduction on QCD and effective models in the first chapter, I analyze the dependence of the QCD transition temperature on the quark (or pion) mass in the second chapter. I found that a linear sigma model, which links the transition to chiral symmetry restoration, predicts a much stronger dependence of T_c on m_pi than seen in present lattice data for m_pi >~ 0.4 GeV. On the other hand, an effective Lagrangian for the Polyakov loop requires only small explicit symmetry breaking to describe T_c(m_pi) in the above mass range. In the third and fourth chapter, I study the linear sigma model with O(N) symmetry at nonzero temperature in the framework of the Cornwall-Jackiw-Tomboulis formalism. Extending the set of two-particle irreducible diagrams by adding sunset diagrams to the usual Hartree-Fock (or Hartree) contributions, I derive a new approximation scheme which extends the standard Hartree-Fock (or Hartree) approximation by the inclusion of nonzero decay widths.
No associations
LandOfFree
Selfconsistent calculations of mesonic properties at nonzero temperature does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Selfconsistent calculations of mesonic properties at nonzero temperature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selfconsistent calculations of mesonic properties at nonzero temperature will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-594035