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POWER code issues
by Anuj Kankani 31 Aug '23

31 Aug '23

Hi, I was recently suggested the POWER ( https://git.ncsa.illinois.edu/elihu/Gravitational_Waveform_Extractor/) code for some GW extrapolation work I was doing by Gabriele Bozzola but I believe I found some bugs and he suggested I send an email here. Running the script as is on the GW150914 gallery example gives me results significantly different from what the plots on the ET website show. I found replacing where the code currently fits the strain amplitude and phase to a polynomial expression with numpy polyfit seems to fix the main problem. I also noticed in the getCutoffFrequencyFromTwoPuncturesBBH function, lines 341 - 347 have an incorrect equation for angular momentum, it looks like a typo between position and momentum. Right now its position * momentum - momentum^2. I'm not sure if this code is being actively used, but I saw there were git branches for the latest ET release. Thanks, Anuj Kankani

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 30 Aug '23

30 Aug '23

Hello, Please consider joining the weekly Einstein Toolkit phone call at 9:00 am US central time on Thursdays. For details on how to connect and what agenda items are to be discussed, use the link below. https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call --The Maintainers

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 28 Aug '23

28 Aug '23

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

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Error Estimation for RK45CK
by Garrison, David 24 Aug '23

24 Aug '23

Hello, Where in the MoL is the error estimates for RK45 calculated? I can’t seem to find that in the source code. Somehow they are written to the MOL::ERRORESTIMATE grid function but I can’t see where that is done. -DG -- David Garrison, Ph.D. Associate Dean for the College of Science and Engineering, Professor and Founding Chair of Physics University of Houston-Clear Lake Bayou 3611 Houston, TX 77058 Phone: 281-283-3796 https://www.uhcl.edu/science-engineering/faculty/garrison-david http://www.uhcl.edu/physics "If we knew what it was we were doing, it would not be called research, would it?" — Albert Einstein.

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Meeting Minutes, August 24, 2023
by Cupp, Samuel D. 24 Aug '23

24 Aug '23

Chair - Leo Minutes - Sam Attendees - Roland Peter Yosef ET_2023_11 release SpaceTimeX likely will not be included Yosef - this means there's no spacetime evolution thorn, greatly reducing what can be done with CarpetX While true, these thorns are also on Erik's plate, for the most part, and he is busy with CarpetX release. They also haven't been used for a publication or an equivalent quality control. Even if CarpetX is included without a spacetime evolution thorn, having CarpetX in the toolkit will simplify future releases with CarpetX-based codes. Also, if people want to use the Z4c thorn in SpacetimeX, they can still check it out at their own peril. AsterX also doesn't have a publication, so the reviewer will need to check whether AsterX is actually ready for inclusion. Is the paper just limited by writing, or is something still not working correctly? Roland - I think there was an issue with TOV star evolution, but I don't know if that was resolved. Bruno hasn't responded in regard to being a reviewer for the AsterX arrangement. Sam - Samuel Tootle volunteered to review it, though I don't know if one person is enough for the whole arrangement. I'll make sure the reviewer(s) clarify whether AsterX is completely working and the paper is just a matter of writing, or if there's still something being debugged. Unanswered emails: "Loss of precision after postintial?" Con2Prim runs after initial data is set, even with checkpoint/restart. This means that the data can potentially change depending on which evolution thorn is being used. Since finite differences were mentioned, one could also try increasing resolution and see how this affects the precision. Tickets: Ticket 2749<https://bitbucket.org/einsteintoolkit/tickets/issues/2749/wvuthorns-sprintf…> - Leo will address this issue. Next week's meeting: Chair - Peter Minute taker - Leo Samuel Cupp Postdoctoral Researcher Department of Physics University of Idaho

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 23 Aug '23

23 Aug '23

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 21 Aug '23

21 Aug '23

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

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Registration open for NR community calls in the Fall
by Nils Vu 18 Aug '23

18 Aug '23

Dear Numerical Relativists, A new season of NR community calls is approaching! Registration is now open to present at one of the calls starting on Sep 11, 2023. Please sign up here: - Request a slot to present at the NR community calls: https://github.com/sxs-collaboration/nr-community-call/wiki The NR community call is a monthly meeting to foster exchange between our numerical-relativity groups and codes. We usually have two speakers from different groups give brief (10-15min) talks, often on a technical aspect of the numerical-relativity code that they are working with, presenting what works well and what they are struggling with. The talks are followed by 15min of discussion. The speakers are preferably early-career researchers, so the calls are also a good opportunity to increase your visibility to our community. As always: - Feel free to circulate this information within the NR community. - Please subscribe to our mailing list <https://groups.google.com/u/1/a/black-holes.org/g/nr-community-call/> to receive info on the community calls in the future (or send a short message to nr-community-call+subscribe(a)black-holes.org <mailto:nr-community-call+subscribe@black-holes.org> to subscribe) and join our Slack <https://join.slack.com/t/generalrelativity/shared_invite/zt-dl4gqb6v-aAuw~p…> for discussions (channel: #nr-community-call <https://generalrelativity.slack.com/archives/C021LLTLK37>). - Details and schedule in the wiki: https://github.com/sxs-collaboration/nr-community-call/wiki Best, Nils — Nils Vu, Ph.D. (he/him) Sherman Fairchild Postdoctoral Fellow in Theoretical Astrophysics California Institute of Technology

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Installing kuibit in Ubuntu 23.04
by CJ Osakwe 17 Aug '23

17 Aug '23

Hello, I'm not sure who to talk to about this, but I can't get the command to install Kuibit to work. I've been using the Einstein Toolkit for a few months now, and I wanted to update everything in light of the recent 'Schwarzschild' release. The toolkit itself was fine, but when I input the shell command to install Kuibit: pip install --user -U kuibit==1.4.0 I receive the following error message: error: externally-managed-environment This environment is externally managed ╰─> To install Python packages system-wide, try apt install python3-xyz, where xyz is the package you are trying to install. If you wish to install a non-Debian-packaged Python package, create a virtual environment using python3 -m venv path/to/venv. Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make sure you have python3-full installed. If you wish to install a non-Debian packaged Python application, it may be easiest to use pipx install xyz, which will manage a virtual environment for you. Make sure you have pipx installed. See /usr/share/doc/python3.11/README.venv for more information. note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages. hint: See PEP 668 for the detailed specification. I should mention that my version of Python no longer recognizes that kuibit is installed, i.e., when I run Python I get the error: ModuleNotFoundError: No module named 'kuibit'. This is what motivated me to update everything in the first place. Thanks, CJ Osakwe Ph.D. candidate, University of Calgary

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Meeting Minutes, August 17, 2023
by Cupp, Samuel D. 17 Aug '23

17 Aug '23

Chair - Peter Minute taker - Sam Attendees - Leo, Steve ET_2023_11 release AsterX still needs reviewer SpacetimeX might need a second reviewer As a reminder, reviews should be completed by 9/20/23. Please add any questions/comments to the respective tickets on the ticket tracker<https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open>. Unanswered emails: "Problems running BBH example" - Steve replied and it was resolved; may not have been reply all "Issues at installation" - Sam, Leo, and/or Zach will check if anyone replied without a reply all; otherwise, they will reply to this "Error Estimation for RK45CK" - Peter will work on replying to this Next week (8/24): Chair - Leo Minute Taker - Steve Samuel Cupp Postdoctoral Researcher Department of Physics University of Idaho

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