Eur. Phys. J. A (2016) 52: 14
https://doi.org/10.1140/epja/i2016-16014-5

Regular Article - Theoretical Physics

Modelling hybrid stars in quark-hadron approaches

¹ FIAS, Ruth-Moufang-Str. 1, 60438, Frankfurt am Main, Germany
² Department of Physics, Kent State University, 44242, Kent, OH, USA
³ Federal Fluminense University, Av. Gal. Milton Tavares de Souza, 24210-346, Gragoata, Niteroi, Brazil

^* e-mail: schramm@fias.uni-frankfurt.de

Received: 24 July 2015
Accepted: 21 August 2015
Published online: 28 January 2016

Abstract

The density in the core of neutron stars can reach values of about 5 to 10 times nuclear matter saturation density. It is, therefore, a natural assumption that hadrons may have dissolved into quarks under such conditions, forming a hybrid star. This star will have an outer region of hadronic matter and a core of quark matter or even a mixed state of hadrons and quarks. In order to investigate such phases, we discuss different model approaches that can be used in the study of compact stars as well as being applicable to a wider range of temperatures and densities. One major model ingredient, the role of quark interactions in the stability of massive hybrid stars is discussed. In this context, possible conflicts with lattice QCD simulations are investigated.