Eur. Phys. J. A (2017) 53: 139
https://doi.org/10.1140/epja/i2017-12328-0

Regular Article - Theoretical Physics

Extended soft wall model with background related to features of QCD thermodynamics

¹ Helmholtz-Zentrum Dresden-Rossendorf, PF 510119, D-01314, Dresden, Germany
² Institut für Theoretische Physik, TU Dresden, D-01062, Dresden, Germany

^* e-mail: rico@hierbeizoellners.de

Received: 12 January 2017
Accepted: 23 May 2017
Published online: 27 June 2017

Abstract

The soft wall model is extended to accommodate at the same time i) approximately linear meson Regge trajectories at zero temperature T, ii) various options for the thermodynamics with reference to QCD (cross-over or second-order transition or first-order transition at , and iii) the appearance of vector meson states at . While the vector meson masses display some modest model dependence very near to , they stay below to good accuracy independent of the temperature, that is nearly as at , thus being very consistent with the thermo-statistical models widely employed in analyses of the hadron yields in relativistic heavy-ion collisions in a region where baryon densitiy effects can be neglected and the vacuum hadron masses are used.