Polytropic Equations of State

The default type of equation of state for RNS is tabulated, but RNS will also compute polytropic stars. The polytropic equation of state is

$$p = K \rho_0^{1 + 1/n}$$ (2)

where p is the pressure, $\rho_0$ is the baryon mass density, K is the polytropic constant, and n is the polytropic index. To specify a polytrope with index n, the following command line options need to be specified:

rns -q poly -N index

The program uses the dimensionless units described by Cook, Shapiro & Teukolsky 1994. All quantities are reported in dimensionless units if a polytropic star is indicated.