Possible neutron star compositions

Spin evolution of neutron stars

Gmn8pTmn

Tmn= (e+P) um un+ P gmn

Einstein's field equation:

Energy-momentum tensor:

P(e)

Energy-momentum tensor

Local inertial frame

Self-consistent solution of Einstein's equations

1 Choose a starting value for the Kepler frequency 2 Choose a starting value for the frame dragging frequency3 Specify metric functions 4 Compute Christoffel symbols5 Compute Ricci tensor and Ricci scalar6 Einstein tensor7 Compute new value for Kepler frequency -> back to 4)

Choose a model for the equation of state of superdense matter

Rotational periods of seven pulsars