Hi Phil,

I'm not sure what the status of SPH is in the ET (my guess is nothing public), but there is a relativistic formulation of SPH for fixed background spacetimes developed by Rosswog:

https://doi.org/10.1088/0264-9381/27/11/114108

In this picture, one would reconstruct the 4-metric from the 3-metric, lapse, and shift to calculate the motion of the particles.

Best,

Jonah

On Tue, Sep 26, 2017 at 1:29 AM, Philip Chang <chang65@uwm.edu> wrote:

Dear developers,

I saw that there was a discussion back in 2015 in regard to SPH in the
Einstein toolkit. Have any progress been made in this regard? I am
especially interested in how the sph particles move (and what it means
to move) in a 3+1 split.

Cheers,

Phil Chang

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