Within this nucleon-meson model, a chiral density wave in neutron star cores is only stable for equations of state too soft to support observed two-solar-mass pulsars, predicting isotropic cores.
Inhomogeneous islands and continents in the Nambu--Jona-Lasinio model
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abstract
We present some recent developments in our study of inhomogeneous chiral symmetry breaking phases in the Nambu--Jona-Lasinio model. First, we investigate different kinds of one- and two-dimensional spatial modulations of the chiral condensate within the inhomogeneous "island" and compare their free energies. Next, we employ the Polyakov-loop extended version of the model to study the effects of varying the number of colors on the inhomogeneous region. Finally, we discuss the properties of an inhomogeneous "continent" which appears in our model at higher chemical potentials, and analyze its origin.
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How neutron star properties disfavor a nuclear chiral density wave
Within this nucleon-meson model, a chiral density wave in neutron star cores is only stable for equations of state too soft to support observed two-solar-mass pulsars, predicting isotropic cores.