<div dir="ltr">Nisa<div><br></div><div>There are two important use cases for this arrangement:</div><div><br></div><div>(1) To test the Einstein Toolkit; by re-caculating a knows solution one confirms that the spacetime geometry solver in the Einstein Toolkit is working as expected.</div><div><br></div><div>(2) To analyse these spacetimes or to evolve test fields in them. For example, we can study the behaviour of horizons in known solutions, or trace geodesics, or evolve test matter fields in these spacetimes. Those calculations might otherwise be impossible, even though the geometry of the spacetime is known analytically. See e.g. <<a href="https://arxiv.org/abs/gr-qc/0511017">https://arxiv.org/abs/gr-qc/0511017</a>> or <<a href="https://arxiv.org/abs/1007.2990">https://arxiv.org/abs/1007.2990</a>> for examples.</div><div><br></div><div>-erik</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 22, 2018 at 9:18 AM, Nisa Amir <span dir="ltr"><<a href="mailto:nisaamir@math.qau.edu.pk" target="_blank">nisaamir@math.qau.edu.pk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello everyone, <div><br></div><div>I want to ask that if we compute any space-time in EinsteinExact arrangement in initial data form where we can can use this initial data set? what is the physical significance of this thorn arrangement. </div><div>Your help will be highly appreciated.</div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Erik Schnetter <<a href="mailto:schnetter@cct.lsu.edu" target="_blank">schnetter@cct.lsu.edu</a>><br><a href="http://www.perimeterinstitute.ca/personal/eschnetter/" target="_blank">http://www.perimeterinstitute.ca/personal/eschnetter/</a></div><div><br></div></div></div>
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