Ndim_ := 4:
x1_ := xi:
x2_ := theta:
x3_ := phi:
x4_ := t:
sig_ := 2:
complex_ := {}:
g11_ := 7*R^2*alpha*(4*alpha-9+5*xi^2)^(2/5)*(4*alpha-9+xi^2)^2/(112*(4*alpha-9+5*xi^2)^(2/5)*alpha^3-40*xi^2*(4*alpha-9+5*xi^2)^(2/5)*alpha^2-128*2^(4/5)*(alpha-1)^(2/5)*xi^2*alpha^2-504*(4*alpha-9+5*xi^2)^(2/5)*alpha^2-xi^4*(4*alpha-9+5*xi^2)^(2/5)*alpha+688*2^(4/5)*(alpha-1)^(2/5)*xi^2*alpha+90*xi^2*(4*alpha-9+5*xi^2)^(2/5)*alpha+567*(4*alpha-9+5*xi^2)^(2/5)*alpha-896*2^(4/5)*(alpha-1)^(2/5)*xi^2):
g22_ := R^2*xi^2:
g33_ := R^2*xi^2*sin(theta)^2:
g44_ := -(4*alpha-9+xi^2)^4/(4*alpha-9)^4:
constraint_:=[]:
Info_:=` M. Durgapal, J. Phys. A, 15,  2637 (1982), M. Korkina, Sov. Phys. J. 24,  468 (1981)`: