blob: b9f8edb6923afa8f908319deedf4b4ed6442f33b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
# Copyright Christian D. Ott, Dec 29, 2012
# cott@tapir.caltech.edu
#
# python script that takes fundamental constants and spits out
# conversion factors between c = G = M_Sun = 1 and cgs
# constants from NIST table, 2010 data
# solar mass from http://asa.usno.navy.mil/SecK/2013/Astronomical_Constants_2013.pdf
ggrav = 6.6738480e-8 #cgs
clite = 2.99792458e10 #cgs
msun = 1.9884e33 #cgs
print "Using the following constants:"
print "G: 6.6738480e-8 cm**3 / g / s**2"
print "c: 2.99792458e10 cm / s"
print "M_sun: 1.9884e33 g"
print " mass_gf=%22.14E" % (1.0/msun)
print " inv_mass_gf=%22.14E" % msun
# length
length_gf = 1.0/(ggrav/clite**2 * msun)
inv_length_gf = 1.0/length_gf
print " length_gf=%22.14E" % length_gf
print "inv_length_gf=%22.14E" % inv_length_gf
# density
rho_gf = 1.0/msun * 1.0/length_gf**3
inv_rho_gf = 1.0/rho_gf
print " rho_gf=%22.14E" % rho_gf
print " inv_rho_gf=%22.14E" % inv_rho_gf
# time
time_gf = clite * length_gf
inv_time_gf = 1.0/time_gf
print " time_gf=%22.14E" % time_gf
print " inv_time_gf=%22.14E" % inv_time_gf
# specific internal energy erg / gram
eps_gf = 1.0/clite**2
inv_eps_gf = clite**2
print " eps_gf=%22.14E" % eps_gf
print " inv_eps_gf=%22.14E" % inv_eps_gf
# pressure
press_gf = 1.0/msun * inv_time_gf**2 * inv_length_gf
inv_press_gf = 1.0/press_gf
print " press_gf=%22.14E" % press_gf
print " inv_press_gf=%22.14E" % inv_press_gf
|
