<div dir="ltr">Hi Thejas,<div><br></div><div>The oscillations in the maximum density inside the neutron star are due to numerical errors. Try increasing the numerical resolution, and you'll find that they converge away. Numerical errors stem from many causes: the sharp dropoff of density where the neutron star touches the artificial atmosphere, uneven resolution (the spherical star is being modeled inside a cubical grid), reconstruction of hydrodynamic variables, derivatives of the metric source terms, spacetime evolution errors, time evolution errors, etc. So while you ask about the "physics" of a single stable neutron star, the dynamics you are seeing are the result of the approximate "numerical" algorithms used to model it.</div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px">-Zach</div><div style="font-size:12.8px"><br></div><span style="font-size:12.8px">* * *</span><br style="font-size:12.8px"><span style="font-size:12.8px">Zachariah Etienne</span></div><div><span style="font-size:12.8px">Assoc. Prof. of Physics, U. of Idaho</span></div><div><span style="font-size:12.8px">Adjunct Assoc. Prof. of Physics & Astronomy, West Virginia U.</span></div><div dir="ltr"><div><a href="https://etienneresearch.com" target="_blank">https://etienneresearch.com</a></div><div><a href="https://blackholesathome.net/" target="_blank">https://blackholesathome.net</a><br></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 13, 2023 at 2:14 AM Thejas A Nair <<a href="mailto:thejasanair275@gmail.com">thejasanair275@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi,</div><div>I would like to know more physics about the single stable neutron star solved using the toolkit as part of my master's project. Would you be able to throw some light on this?</div><div>And I have a question about the time scales used in this particular problem, they are of order 10^-6, usually, neutron stars are highly compact objects, In this problem, the density was of the order 10^-3 why are these scales chosen, and this paper said (<a href="https://arxiv.org/abs/1111.3344" target="_blank">https://arxiv.org/abs/1111.3344</a>.) the spikes in the graphs are due to the interaction with the artificial atmosphere I would like to know more about it.</div><div>I am attaching my results.</div><div>Warm regards<br></div></div>
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