In order to obtain the equation of state and construct hybrid stars, we calculate the thermodynamic potential in the two-flavor Nambu–Jona-Lasinio model with tensor-type four-point interaction between quarks. In addition, we impose the $\beta$ equilibrium and charge neutrality conditions on the system. We show that the tensor condensate appears at large chemical potential, however, it is difficult to hold hybrid stars with two-solar mass by using the equation of state with the tensor interaction. Although we cannot obtain the stars with two-solar mass because of the absence of the repulsive interaction, the estimated magnetic moment density is very large. Therefore, we expect that the tensor interaction describes the magnetic fields of compact stars.

• Received 12 June 2018

DOI:https://doi.org/10.1103/PhysRevD.98.074027

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Published by the American Physical Society