Multiquark interactions and heavy hybrid stars

Abstract

We introduce a two flavor Nambu--Jona-Lasinio (NJL) model with 8-quark interactions in the scalar and the vector channel. With the lower density region described by the density-dependent relativistic mean field model we construct a hybrid equation of state. We especially focus on the 4-quark vector couplings and the 8-quark vector NJL couplings and allocate a region in this parameter subspace where hybrid stars with masses larger than $2M_{\odot }$ exist.

Comments: 5 pages, 3 figures, Proceedings of the "Compact Stars in the QCD phase diagram IV" workshop, Prerow, Germany, September 26 - 30, 2014