1 files changed, 72 insertions, 0 deletions
diff --git a/src/metrics/Schwarzschild_BL.F b/src/metrics/Schwarzschild_BL.F
new file mode 100644
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+++ b/src/metrics/Schwarzschild_BL.F
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+c Schwarzschild spacetime in Brill-Lindquist coordinates.
+C
+c $Header$
+
+#include "cctk.h"
+#include "cctk_Parameters.h"
+
+      subroutine Exact__Schwarzschild_BL(
+     $     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
+      CCTK_DECLARE(CCTK_REAL, 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_DECLARE(CCTK_REAL, psi,)
+      LOGICAL   Tmunu_flag
+
+c local variables
+      CCTK_REAL eps, m
+
+c local variables
+      CCTK_REAL r, psi4
+
+C This is a vacuum spacetime with no cosmological constant
+      Tmunu_flag = .false.
+
+C     Get parameters of the exact solution.
+
+      eps = Schwarzschild_BL__epsilon
+      m   = Schwarzschild_BL__mass
+
+      r = ((x**2 + y**2 + z**2)**2 + eps**4) ** 0.25d0
+      psi4 = (1 + m / (2 * r)) ** 4
+
+      gdtt = -1
+      gdtx = 0
+      gdty = 0
+      gdtz = 0
+      gdxx = psi4
+      gdyy = psi4
+      gdzz = psi4
+      gdxy = 0
+      gdyz = 0
+      gdzx = 0
+
+      gutt = -1
+      gutx = 0
+      guty = 0
+      gutz = 0
+      guxx = 1 / psi4
+      guyy = 1 / psi4
+      guzz = 1 / psi4
+      guxy = 0
+      guyz = 0
+      guzx = 0
+
+      return
+      end