[ET Trac] [Einstein Toolkit] #950: "Correct" Weyl Scalar symmetries

[Einstein Toolkit]

#950: "Correct" Weyl Scalar symmetries
---------------------------------+------------------------------------------
 Reporter:  yosef@…              |        Type:  defect
   Status:  new                  |    Priority:  major 
Milestone:                       |   Component:  Other 
  Version:                       |    Keywords:        
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 RotatingSymmetry180 and the ReflectionSymmetry thorns
 define a tensor alias "weylscalars_real", but the symmetries given there
 do not correspond to those of the usual re[psi0], im[psi0], re[psi1],
 im[psi1],
 etc scalars.


 The Weyl symmetries as provided in RotatingSymmetry180

 static int const weylparities[10][3] =
            {{+1,+1,+1},
             {-1,-1,-1},
             {+1,+1,+1},
             {-1,-1,-1},
             {+1,+1,+1},
             {-1,-1,-1},
             {+1,+1,+1},
             {-1,-1,-1},
             {+1,+1,+1},
             {-1,-1,-1}};


 The symmetries for rpsi0, ipsi0, rpsi1, ipsi1, ..., rpsi4, ipsi4

 static int const weylparities[10][3] =
    {{+1,+1,+1},  /* rpsi0 */
     {-1,-1,-1},  /* ipsi0 */
     {+1,+1,-1},  /* rpsi1 */
     {-1,-1,+1},  /* ipsi1 */
     {+1,+1,+1},  /* rpsi2 */
     {-1,-1,-1},  /* ipsi2 */
     {+1,+1,-1},  /* rpsi3 */
     {-1,-1,+1},  /* ipsi3 */
     {+1,+1,+1},  /* rpsi4 */
     {-1,-1,-1}}; /* ipsi4 */

 attached is a diff between the current ET version of the Reflection and
 RotatingSymmetry180 thorns and the "corrected" version.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/950>
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