The Vector Manifestation and Effective Degrees of Freedom at Chiral Restoration

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概要

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• The role of effective degrees of freedom on the vector and axial-vector susceptibilities and the pion velocity at chiral restoration is analyzed. We consider two possible scenarios, one in which pions are considered to be the only low-lying degrees of freedom - that we shall refer to as "standard" - and the other in which pions, vector mesons and constituent quarks (or quasiquarks in short) are the relevant low-lying degrees of freedom - that we shall refer to as "vector manifestation (VM)". We show at one-loop order in chiral perturbation theory with hidden local symmetry Lagrangian that while in the standard scenario, the pion velocity vanishes at the chiral transition, it instead approaches unity in the VM scenario. If the VM is realized in nature, the chiral phase structure of hadronic matter can be much richer than that in the standard one and the phase transition will be a smooth crossover: Sharp vector and scalar excitations are expected in the vicinity of the critical point. Some indirect indications that lend support to the VM scenario, and in consequence to BR scaling, are discussed.

• 2003-07-18

著者

• Rho Mannque

  Service De Physique Theorique

• Rho Mannque

  Service De Physique Theorique Cea-dsm-spht Unite De Recherche Associee Au Cnrs Cea-saclay:school Of

関連論文

• Pion Velocity near the Chiral Phase Transition Point in the Vector Manifestation(Non-equilibrium Dynamics in the QCD Phase Transitions)
• Compact-Star Matter in Chiral Lagrangians
• Hidden Local Symmetry and the Vector Manifestation of Chiral Symmetry in Hot and/or Dense Matter(Change of hadron properties in medium, Chiral dynamics in nuclear medium, New Frontiers in QCD-Exotic Hadrons and Hadronic Matter-)
• The Vector Manifestation and Effective Degrees of Freedom at Chiral Restoration

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