Hypermassive quark cores

TL;DR

This paper models hybrid stars with quark cores using QHD and MIT models, achieving maximum masses over 2 solar masses and significant quark core fractions, advancing understanding of dense stellar objects.

Contribution

It introduces hybrid star models with large quark cores and high maximum masses using quantum hadrodynamics and MIT models under Maxwell transition criteria.

Findings

Maximum hybrid star mass of 2.15 solar masses.

Existence of stars with over 80% quark core mass and radius.

Hybrid stars with substantial quark cores are theoretically feasible.

Abstract

Using a quantum hadrodynamics (QHD) and MIT based models we construct hybrid stars within the Maxwell criteria of hadron-quark phase transition. We are able to produce a hybrid star with maximum mass of 2.15$M_\odot$. Furthermore, a 2.03$M_\odot$ star with a quark core corresponding to more than $80\%$ of both, its total mass and radius, is also possible.