Hi Yosef,

I'm not so familiar with the parities in the symmetry thorns, but I am reasonably confident that the manual Cartesian parities which are set by WeylScal4 are correct (in fact, there was correction committed just a few days ago). So, it seems likely that the parities in the symmetry thorns are either wrong or my interpretation of what they mean is wrong.

Can someone who is familiar with the symmetry thorns comment on whether the code there is correct? Are these parities used by any actively used code? It looks like they were added for PsiKadelia.

Barry

On Fri, May 18, 2012 at 4:02 PM, Yosef Zlochower <yosef@astro.rit.edu> wrote:
Hi,

 I noticed that WeylScal4 sets the symmetries of the Weyl scalars by
defining the real and imaginary parts of each of the psi's in a
different group. RotatingSymmetry and the ReflectionSymmetry thorns
define a tensor alias "weylscalars_real", but the symmetries given there
do not correspond to those of the psi's.


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 */


--
Dr. Yosef Zlochower
Center for Computational Relativity and Gravitation
Assistant Professor
School of Mathematical Sciences
Rochester Institute of Technology
85 Lomb Memorial Drive
Rochester, NY 14623

Office:74-2067
Phone: +1 585-475-6103

yosef@astro.rit.edu

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