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Abstract: The three-flavor crystalline color-superconducting CCS phase of quantumchromodynamics QCD is a candidate phase for the ground state of cold matterat moderate densities above the density of the deconfinement phase transition.Apart from being a superfluid, the CCS phase has properties of a solid, such asa lattice structure and a shear modulus, and hence the ability to sustainmultipolar deformations in gravitational equilibrium. We construct equilibriumconfigurations of hybrid stars composed of nuclear matter at low, and CCS quarkmatter at high, densities. Phase equilibrium between these phases is possibleonly for rather stiff equations of state of nuclear matter and large couplingsin the effective Nambu-Jona-Lasinio Lagrangian describing the CCS state. Weidentify a new branch of stable CCS hybrid stars within a broad range ofcentral densities which, depending on the details of the equations of state,either bifurcate from the nuclear sequence of stars when the central densityexceeds that of the deconfinement phase transition or form a new family ofconfigurations separated from the purely nuclear sequence by an instabilityregion. The maximum masses of our non-rotating hybrid configurations areconsistent with the presently available astronomical bounds. The sequences ofhybrid configurations that rotate near the mass-shedding limit are found to bemore compact and thus support substantially larger spins than their same massnuclear counterparts.



Autor: Nicola Ippolito, Marco Ruggieri, Dirk Rischke, Armen Sedrakian, Fridolin Weber

Fuente: https://arxiv.org/



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