XPost: sci.physics, sci.electronics.design   
   From: PointedEars@web.de   
      
   Thomas 'PointedEars' Lahn wrote:   
   > The Einstein Field Equations are in units where c = 1   
   >   
   >   G_ab + Lambda g_ab = 8pi G T_ab,   
   >   
   > where   
   >   
   >   G_ab = R_ab - 1/2 R g_ab   
   >   
   > is (a component of) the Einstein tensor, R_ab is the Ricci curvature tensor,   
   > g_ab is the metric tensor, R = g^ab R_ab is the Ricci curvature scalar,   
   > Lambda is the cosmological constant, and T_ab is the   
   > (stress--)energy--momentum tensor.   
   >   
   > Gravitional effects are understood (in GR) as a consequence of the curvature   
   > of spacetime which is described by the quantities on the left-hand side of   
   > the equations.   
   >   
   > The energy--momentum tensor of a 1+3-dimensional spacetime has 16   
   > components, but it is antisymmetric so only 10 of them are unique.   
      
   Sorry, it's _symmetric_, of course --   
      
     (T_00  T_01  T_02  T_03)   (T_00  T_01  T_02  T_03)   
     (T_10  T_11  T_12  T_13) = (T_01  T_11  T_12  T_13).   
     (T_20  T_21  T_22  T_23)   (T_02  T_12  T_22  T_23)   
     (T_30  T_31  T_32  T_33)   (T_03  T_12  T_23  T_33)   
      
   --   
   PointedEars   
      
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