(FIAS), Johann Wolfgang Goethe-Universität, Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main, Germany\
    3) Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany\
    4) Gesellschaft für Schwerionenforschung (GSI), Planckstr. 1, D-64291 Darmstadt, Germany 
author:
- |
    Qingfeng Li$\, ^{1,2}$[^1], Jan Steinheimer$\, ^{3}$[^2], Hannah Petersen$\, ^{2,3}$[^3], Marcus Bleicher$\,
    ^{3}$[^4], and Horst Stöcker$\, ^{2,3,4}$[^5]
title: Effects of a phase transition on HBT correlations in an integrated Boltzmann+Hydrodynamics approach
---

Introduction
============

One of the main purposes of the research in heavy ion collisions (HICs) at high beam energies is to explore the existence of the quark gluon plasma (QGP) as well as its properties. The equation of state (EoS) of nuclear matter is one of the key points to gain further understanding since the EoS directly provides the relationship between the pressure and the energy at a given net-baryon density. Phase transitions (PT), e.g., from the hadron resonance gas phase (HG) to the color-deconfined QGP (see e.g., [@Rischke:1995mt; @Spieles:1997ab; @Bluhm:2007nu]), constitute themselves in changes of the underlying EoS.

Although, on the low temperature side (and for low baryo-chemical potentials $\mu_B$), investigations of the EoS of nuclear matter have been pursued for many years and uncertainties have been largely reduced, 