Abstract
We explore the possibility of obtaining heavy hybrid stars within the framework of the two flavor Nambu-Jona-Lasinio model that includes 8-quark interactions in the scalar and in the vector channel. The main impact of the 8-quark scalar channel is to reduce the onset of quark matter, while the 8-quark vector channel acts to stiffen the equation of state at high densities. Within the parameter space where the 4-quark vector channel is small, and the 8-quark vector channel sizeable, stable stars with masses of 2 M ⊙ and above are found to hold quark matter in their cores.
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Benić, S. Heavy hybrid stars from multi-quark interactions. Eur. Phys. J. A 50, 111 (2014). https://doi.org/10.1140/epja/i2014-14111-1
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DOI: https://doi.org/10.1140/epja/i2014-14111-1