Ginzburg-Landau equations for superconducting quark matter in neutron stars

Abstract

We investigate magnetic properties of color superconducting quark matter within a Ginzburg-Landau approach. The simultaneous coupling of the quark fields to gluonic and electromagnetic gauge fields leads to rotated electromagnetism with a massive (Higgsed) and a massless photon-gluon field. We derive the Ginzburg-Landau equations for superconducting quark matter taking into account the rotated electromagnetism in the general case when the rotation angle is an arbitrary function of the coordinates. We solve these equations for an isolated vortex in superconducting quark matter. We obtain a solution for the magnetic and gluomagnetic fields and expressions for the calculation of the penetration depth and the quantized magnetic flux in quark matter. For this case we have demonstrated that the occurence of electric and color Meissner currents is a consequence of the color superconducting state of quark matter.