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C DeSitter metric spacetime with cosmological constant
C
C Author : D. Vulcanov (Timisoara, Romania)
C see ../../README for copyright & licensing info
C
C $Header$
#include "cctk.h"
#include "cctk_Parameters.h"
subroutine Exact__de_Sitter_Lambda(
$ 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 static variables
logical firstcall
CCTK_REAL arad
data firstcall /.true./
save firstcall, arad
c local variables
CCTK_REAL am
C This model is non-vacuum
C ==> it sets the stress-energy tensor in the "CalcTmunu" code
Tmunu_flag = .true.
if (firstcall) then
arad = de_Sitter_Lambda__scale
firstcall = .false.
end if
am=exp(2.0D0*sqrt(arad/3.0d0)*t)
gdtt = -1.d0
gdtx = 0.d0
gdty = 0.d0
gdtz = 0.d0
gdxx = am
gdyy = am
gdzz = am
gdxy = 0.d0
gdyz = 0.d0
gdzx = 0.d0
gutt = -1.d0
gutx = 0.d0
guty = 0.d0
gutz = 0.d0
guxx = 1.d0/am
guyy = 1.d0/am
guzz = 1.d0/am
guxy = 0.d0
guyz = 0.d0
guzx = 0.d0
return
end
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