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C Kasner-like metric spacetime !!!!
C See: L. Pimentel, Int. Journ. of Theor. Physics,
C, vol. 32, No. 6, 1993, p. 979 (and the references
C cited here), and S. Gotlober, et. al. Early Evolution
C of the Universe and Formation Structure, Akad. Verlag, 1990
C
C Author : D. Vulcanov
C see ../../README for copyright & licensing info
C
C $Header$
#include "cctk.h"
#include "cctk_Parameters.h"
subroutine Exact__Kasner_like(
$ x, y, z, t,
$ gdtt, gdtx, gdty, gdtz,
$ gdxx, gdyy, gdzz, gdxy, gdyz, gdzx,
$ gutt, gutx, guty, gutz,
$ guxx, guyy, guzz, guxy, guyz, guzx,
$ psi, Tmunu_flag)
implicit none
DECLARE_CCTK_PARAMETERS
c input arguments
CCTK_REAL x, y, z, t
c output arguments
CCTK_REAL gdtt, gdtx, gdty, gdtz,
$ gdxx, gdyy, gdzz, gdxy, gdyz, gdzx,
$ gutt, gutx, guty, gutz,
$ guxx, guyy, guzz, guxy, guyz, guzx
CCTK_REAL psi
LOGICAL Tmunu_flag
c local variables
CCTK_REAL qq,a1,a3
c this model sets the stress-energy tensor in the "CalcTmunu" code
Tmunu_flag = .true.
qq = Kasner_like__q
a1= t**(2.d0*qq)
a3= t**(2.d0-4.d0*qq)
gdtt = -1.d0
gdtx = 0.d0
gdty = 0.d0
gdtz = 0.d0
gdxx = a1
gdyy = a1
gdzz = a3
gdxy = 0.d0
gdyz = 0.d0
gdzx = 0.d0
gutt = -1.d0
gutx = 0.d0
guty = 0.d0
gutz = 0.d0
guxx = 1.d0/a1
guyy = 1.d0/a1
guzz = 1.d0/a3
guxy = 0.d0
guyz = 0.d0
guzx = 0.d0
return
end
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