Anisotropic pressure can raise the maximum stable neutron-star mass by 50-60 percent in the covariant model, and normalized moment of inertia and binding energy follow nearly model-independent fits.
Regular models with quadratic equation of state
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abstract
We provide new exact solutions to the Einstein-Maxwell system of equations which are physically reasonable. The spacetime is static and spherically symmetric with a charged matter distribution. We utilise an equation of state which is quadratic relating the radial pressure to the energy density. Earlier models, with linear and quadratic equations of state, are shown to be contained in our general class of solutions. The new solutions to the Einstein-Maxwell are found in terms of elementary functions. A physical analysis of the matter and electromagnetic variables indicates that the model is well behaved and regular. In particular there is no singularity in the proper charge density at the stellar centre unlike earlier anisotropic models in the presence of the electromagnetic field.
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Rotating neutron stars: anisotropy model comparison
Anisotropic pressure can raise the maximum stable neutron-star mass by 50-60 percent in the covariant model, and normalized moment of inertia and binding energy follow nearly model-independent fits.