On 04/03/2018 09:54 PM, Erik Schnetter wrote:
Wolfgang
I don't think such a thing exists.
It should be relatively straightforward to calculated the ADM quantities from the ADM variables. I also think this is how it should be done; I was surprised to see that it is done differently. After all, that's why we have the ADM variables -- as lingua franca so that thorns don't have too many interdependencies.
Such a thorn would be nice. However, if there is a good reason to directly use the evolved variables in the BSSN system, it would still be nice to add a CCZ4 version for completeness. I guess it should be easy since Z4 and BSSN are fairly similar.
Do you need the ADM integrands everywhere or just on a 2-sphere? If the latter, then the thorn QuasiLocalMeasures could provide these.
I wanted to have some fun with the actual integrants in 3D. For 2D surface integrals, QLM indeed works just fine for me.
@Roland: In the interface.ccl of ML_ADMConstraints I only see the ADM constraints, no expressions for ADM energy and angular momentum. Or did you mean something else?
Cheers, Wolfgang.
-erik
On Tue, Apr 3, 2018 at 9:05 AM, Wolfgang Kastaun physik@fangwolg.de wrote:
Hi,
I just started using the ML_ADMQuantities thorn (because I wanted the ADM integrants, not just the integrals), and stumbled on two issues:
- It seems this thorn only works with ML_BSSN, is there a version for
ML_CCZ4 somewhere?
- Madm and Jadm3 are declared as tensorweight=0 in the interface.ccl,
but it seems to me that they already include the square root of the 3-metric determinant (at least I got the correct ADM mass by just using the standard average reduction operator on them for some test). Should that be tensorweight=1 instead?
Cheers, Wolfgang.
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