Holographic meson spectra in a dense medium with chiral condensate

Meson masses in a dense nuclear medium

The masses of the scalar (σ) and vector (ω) mesons and their widths in nuclear matter are studied in detail using the quark-meson coupling (QMC) model. It is shown that above normal nuclear matter density the effects of σ-ω mixing and the decay of the σ into 2π change the scalar meson mass considerably, while the vector meson mass remains near its mean-field value. We compare the QMC results wi...

Hunting Medium Modifications of the Chiral Condensate

With QCD sum rule evaluations, spectral changes of hadrons inside nuclear matter are considered, which shed light on QCD condensates and thus on the non-perturbative structure of the QCD ground state. For some light quark configurations, ω meson and nucleon, the relevance of four-quark condensates is compared; the D meson as a representative of heavy-light quark systems is also briefly discussed.

σ and ω meson propagation in a dense nuclear medium

Quantized meson fields in and out of equilibrium. II: Chiral condensate and collective meson excitations

We develop a quantum kinetic theory of the chiral condensate and meson quasiparticle excitations using the O(N) linear sigma model which describe the chiral phase transition both in and out of equilibrium in a unified way. A mean field approximation is formulated in the presence of mesonic quasi-particle excitations which are described by generalized Wigner functions. It is shown that in equili...

The sigma meson and chiral restoration in nuclear medium

The whole content of the present talk is based on the simple fact that chiral transition is a phase transition of the QCD vacuum with the quark condensate 〈q̄q〉 being the order parameter. The relevance of the present talk to this workshop on physics with electromagnetic probes is ensured by the fact that chiral symmetry may be at least partially restored in hot and/or dense hadronic medium, hope...