Derivatives

The derivatives output file will be provided if the options output_derivatives and the use_beta_equilibrium options are enabled. It contains the columns below:

Variable	Unit
Temperature (T)	MeV
Baryon chemical potential (${\mu }_B$)	MeV
Strange chemical potential (${\mu }_S$)	MeV
Electric charge chemical potential (${\mu }_Q$)	MeV
Baryon density ($n_B$)	fm-3
Strange density ($n_S$)	fm-3
Electric charge density ($n_Q$)	fm-3
Speed of sound squared ($c_s^2$)	c
1st baryon susceptibility (${\chi }_{B1}$)	fm-3
2nd baryon susceptibility (${\chi }_{B2}$)	MeV 2
3rd baryon susceptibility (${\chi }_{B3}$)	MeV

The baryon successibilities are defined as

$${\chi }_{Bn}=\frac{{\partial }^{n}P}{\partial {\mu }_B^n},$$

and the speed of sound squared is defined as

$$c_s^2=\frac{\partial P}{\partial ϵ},$$

and is in units of the speed of light squared.