Meson physics in asymmetric matter

5th Compact Stars in the QCD Phase Diagram

Mammarella, Andrea^1 ; Mannarelli, Massimo^1

Laboratori Nazionali Del Gran Sasso, via G. Acitelli 22, Assergi (AQ), Italy^1

关键词: Chiral perturbation theory;    Condensed phasis;    Direct calculation;    Equation of state;    Group analysis;    Isospin;    Lattice calculations;    Normal phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/861/1/012017/pdf
DOI  :  10.1088/1742-6596/861/1/012017

来源: IOP

【 摘 要 】

This paper describes dynamic and thermodynamic (at T = 0) properties of mesons in asymmetric matter in the framework of Chiral Perturbation Theory. We consider the effect of nonzero isospin and strangeness chemical potentials on a mesonic system and report on the corresponding phase diagram. We also study meson masses and mixing in the resulting normal phase, pion condensation phase and kaon condensation phase. We find differences with previous papers regarding meson masses and mixing in the condensed phases; the results presented here are supported by theory group analysis and direct calculations. Pressure, density and equation of state of the system at T = 0 and nonzero μI are calculated, finding remarkable agreement with analogue studies performed by lattice calculations.