physconst.h

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#ifndef PHYSCONST_H
#define PHYSCONST_H
/* ... often used physical constants (cgs units) */
 
#define  GRAVITY     6.672e-8
#define  SOLAR_MASS  1.989e33
#define  SOLAR_LUM   3.826e33
/*Radiation density constant, 4 sigma_stefan-boltzmann / c in erg cm^-3 K^-4*/
#define  RAD_CONST   7.565e-15
#define  AVOGADRO    6.0222e23
#define  BOLTZMANN   1.38066e-16
#define BOLEVK 8.61734e-5
/* 1 eV in ergs*/
#define eVinergs 1.60218e-12
#define  GAS_CONST   8.31425e7
#define  LIGHTCGS           2.99792458e10
#define  PLANCK      6.6262e-27
#define  CM_PER_MPC  3.085678e24
#define  PROTONMASS  1.6726e-24
#define  ELECTRONMASS 9.10953e-28
#define  THOMPSON     6.65245e-25
#define  ELECTRONCHARGE  4.8032e-10
#define  HUBBLE          3.2407789e-18  /* in h/sec */
#define  LYMAN_ALPHA      1215.6e-8 /* 1215.6 Angstroem */
#define  LYMAN_ALPHA_HeII  303.8e-8 /* 303.8 Angstroem */
#define  OSCILLATOR_STRENGTH       0.41615
#define  OSCILLATOR_STRENGTH_HeII  0.41615
 
#define  SEC_PER_MEGAYEAR   3.155e13
#define  SEC_PER_YEAR       3.155e7
 
#define  GAMMA         (5.0/3.0)    
#define  GAMMA_MINUS1  (GAMMA-1)
 
#define  HYDROGEN_MASSFRAC 0.76 
#endif