<div dir="ltr"><div>Hi Phil,<br><br><br></div>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:<br><abbr title="digital object identifier"></abbr>
<p><a href="https://doi.org/10.1088/0264-9381/27/11/114108">https://doi.org/10.1088/0264-9381/27/11/114108</a></p><p>In this picture, one would reconstruct the 4-metric from the 3-metric, lapse, and shift to calculate the motion of the particles.</p><p><br></p><p>Best,</p><p>Jonah<br></p></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Sep 26, 2017 at 1:29 AM, Philip Chang <span dir="ltr"><<a href="mailto:chang65@uwm.edu" target="_blank">chang65@uwm.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear developers,<br>
<br>
I saw that there was a discussion back in 2015 in regard to SPH in the<br>
Einstein toolkit. Have any progress been made in this regard? I am<br>
especially interested in how the sph particles move (and what it means<br>
to move) in a 3+1 split.<br>
<br>
Cheers,<br>
<br>
Phil Chang<br>
<br>
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