Sound waves in hadronic matter

The Speed of Sound in Hadronic Matter

We calculate the speed of sound cs in an ideal gas of resonances, whose mass spectrum is assumed to have the Hagedorn form ρ(m) ∼ m exp{bm}, which leads to singular behavior at the critical temperature Tc = 1/b. With a = 4 the pressure and the energy density remain finite at Tc, while the specific heat diverges there. As a function of the temperature, the corresponding speed of sound initially ...

Strangeness in hadronic stellar matter.

Hyperonic Crystallization in Hadronic Matter

We propose a method for analyzing the formation of spatially ordered configurations in hadronic matter, related to the crystallization of the hyperonic sector in a lattice. The method allows the determination of the density ranges where such ordered configurations are energetically favoured with respect to the usual gaseous configurations. This leads to the determination of the parameters of a ...

Hadronic matter is soft.

The stiffness of the hadronic equation of state has been extracted from the production rate of K+ mesons in heavy-ion collisions around 1 AGeV incident energy. The data are best described with a compression modulus K around 200 MeV, a value which is usually called "soft." This is concluded from a detailed comparison of the results of transport theories with the experimental data using two diffe...

Meson Properties in Dense Hadronic Matter

One of the fundamental questions in strong interaction physics concerns the generation of mass in the sector of light quarks. How can nucleons with a mass of roughly 1 GeV arise from up and down quark masses of less than 10 MeV? The answer lies in the nonperturbative structure of the QCD vacuum itself in which quarks and gluons condense. This is in marked contrast to the heavy-quark sector wher...