Usage

PsiKadelia permits several tetrad choices. These are fixed by specifying the directions of $\hat{v}_{\scriptscriptstyle(1)}{}$ and ${\hat{v}_{\scriptscriptstyle(2)}}{}$ before orthonormalization. These specifications are selected by setting the parameter ``psif_vec''. The most important, and default, parameter value is ``radial'' with directions defined by initially setting

$$\hat{v}_{\scriptscriptstyle(1)}{}^a = \hat r^a$$

$${\hat{v}_{\scriptscriptstyle(2)}}{}^a = \hat \phi^a$$

in terms of the numerical coordinate system. With this choice the tetrad approximates that of the ``usual'' Kerr or Schwarzschild tetrad choice in the asymptotic limit. Another choice which gets some use is ``cartesian'' defined by

$$\hat{v}_{\scriptscriptstyle(1)}{}^a = \hat x^a$$

$${\hat{v}_{\scriptscriptstyle(2)}}{}^a = \hat y^a.$$

The other possibility is ``metric_diag'' which sets

$$\hat{v}_{\scriptscriptstyle(1)}{}^a = \hat z^a$$

$${\hat{v}_{\scriptscriptstyle(2)}}{}^a = \hat x^a.$$

The variable names corresponding to real and imaginary parts of the $\Psi$'s are psi0re, psi0im, psi1re, ...The names for the real and imaginary parts of $I$ and $J$ are icurvre, icurvim, jcurvre and jcurvim.