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Einstein Toolkit Zoom Meeting</p>
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10:00 am, Thursday Jan. 30, 2020</p>
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Present: </p>
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Steven, Phillip, Zach, <span style="font-size:12pt">Maria, Peter, Roland, Vasilli, Bruno, </span><span style="font-size:12pt">Christopher, Eric, Liu, Yosef</span></p>
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<span style="font-size:12pt">Call Chair: Peter</span></p>
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<span style="font-size:12pt">Minute Taker: Maria</span></p>
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<p style=""><span style="font-size: 12pt;"><u>Peter</u> opens the meeting. </span></p>
<p style=""><span style="font-size: 12pt;"><u>Steven</u> reports on his work on removing the old cacuscode.org web page, and creating a new version </span><span style="font-size: 12pt;">on the ETK web page (<a href="http://einsteintoolkit.org/cactuscode.html" class="OWAAutoLink" id="LPlnk921740" previewremoved="true">http://einsteintoolkit.org/cactuscode.html</a>).
He requests critiques in order to </span>proceed<span style="font-size: 12pt;"> forward. </span></p>
<p style=""><span style="font-size: 12pt;">He is the main organizer of the <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">upcoming
US </span><span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">ETK </span><span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Workshop
at LSU and </span>also requests critique on the announcement <span>(<a href="https://docs.einsteintoolkit.org/et-docs/LSU_Workshop_2020" class="OWAAutoLink" id="LPlnk173072" previewremoved="true">https://docs.einsteintoolkit.org/et-docs/LSU_Workshop_2020</a>)</span></span></p>
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<u>Phillips</u> brings news about the EU <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">ETK </span><span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Workshop,
to take place in Amsterdam this year. As main organizer, he requests input and suggestions on the best dates. </span></p>
<p style=""><u>Bruno</u>, as one of the previous organizers, offers helpful suggestions regarding dates (between June and September), as well as number of participants, recommending as a preferable date when school is in session, to attract students.</p>
<p style=""><u>Roland</u> recommends two dates to avoid: during the LIGO meeting, and the LSU ETK workshop. </p>
<p style=""><u>Phillips</u> reported venue constraints, especially when the school is in session, and will report back next week.</p>
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<p style="">Next on the agenda was <u>Vasilli</u>'s update on the Spherical NR working group. (<i>link </i><i>slides?</i>).</p>
<p style="">After his presentation, <u>Bruno</u> asked if is it possible to start evolving the data in cartesian coordinate, and then to transfer to spherical. </p>
<p style=""><u>Vasilli</u> answered that as for now, there is no module to do that, but in the future, if there is need for it, it can be done, similar to the way cartesian Initial Data is read in the spherical code. </p>
<p style=""><u>Maria</u> asked for details on the interpolation, and <u>Vasilli</u> explained. </p>
<p style=""><u>Roland</u> pointed towards a link (<i>address?</i>) that shows how ETK handles the interpolation from cartesian to any grid.</p>
<p style=""><u>Roland</u> asked if the <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">
vector-potential</span> implementation in spherical coordinates can be used in plain cartesian coordinates in GRHydro. </p>
<p style=""><u style="color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Vasilli</u> confirmed that
it can be done, although the outer boundary conditions need to be changed, and the right hand side correction due to spherical coordinates needs to be zero. He also said that he did not look in detail into the mesh refinement. </p>
<p style=""><span> </span></p>
<p style="">Next, <u>Roland</u> gave a report on the ETK status, all is updated with the exception of the SelfForce. He requested a1D wave train example to be included in the gallery. </p>
<p style=""><u>Peter</u> recommended to add the request for features as an open issue, then reviewed the agenda and what was discussed regarding the Cactus and the LSU workshop <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">web
pages</span>. He recommended to send comments directly to <u>Steve</u>. </p>
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Lastly, <span style="font-size: 12pt;"><u>Roland</u> reported that, as at his call nobody stepped forward offering </span><span style="font-size: 12pt;">to </span><span style="font-size: 12pt;">coordinate for the next ETK release, he will undertake this job. </span></p>
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<u>Peter</u> suggested the idea of finding a volunteer to help Roland and to learn, in order to do this next time. </p>
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At <u>Zach's</u> suggestion, the rota for the next two meetings was established as well.</p>
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<u>Roland</u> reported that nothing has changed regarding with the tickets, email list and open issues. </p>
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<u>Peter</u> concluded that <span>no further items are left to discuss, and ended this meeting.</span></p>
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<div dir="ltr">_______________________</div>
<div dir="ltr"><i><font size="2">Maria C. Babiuc Hamilton, Ph.D.</font></i></div>
<div dir="ltr"><i><font size="2">Professor, Department of Physics </font></i></div>
<div dir="ltr"><i style="font-size:12pt"><font size="2"><i style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><font size="2"></font></i>College of Science, </font></i><i style="font-size:12pt"><font size="2">Marshall University,</font></i></div>
<div dir="ltr"><i><font size="2">1 John Marshall Drive, </font></i><i style="font-size:12pt"><font size="2">Huntington, WV, 25755</font></i></div>
<div dir="ltr"><i><font size="2"><i style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><font size="2"><i style="font-size:12pt"><font size="2">Room S 257, <i style="font-size:16px"><font size="2">Phone: (304)696-2754</font></i></font></i></font></i><br>
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