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[nr-community-call] Next NR community call: Monday, Jul 6
by Nils Vu 04 Jul '26

04 Jul '26

Dear Numerical Relativists, Our next NR community call will be on Monday, Jul 6 (9am Pacific, noon NYC, 6pm Berlin). Our speaker will be Stamatis Vretinaris (IMAPP Radboud & AEI). You can find the schedule in the wiki: https://github.com/sxs-collaboration/nr-community-call/wiki 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>). - Please sign up for a slot <https://docs.google.com/forms/d/e/1FAIpQLSfoCnnCJve7J7Jzrpdlqw7nAbwWS_iuX_e…> in the schedule to speak at one of the community calls: https://github.com/sxs-collaboration/nr-community-call/wiki Best, Nils — Nils Vu (he/him) SNSF Ambizione Fellow University of Zurich To unsubscribe from this group and stop receiving emails from it, send an email to nr-community-call+unsubscribe(a)black-holes.org.

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number of thesis using the Einstein Toolkit
by Helvi Witek 02 Jul '26

02 Jul '26

Dear all, for a report to the National Science Foundation (NSF) I am trying to obtain an idea of how many student thesis were using (whether in progress or submitted) the Einstein Toolkit or CarpetX. So if you are a student or are working with a student and have *used the Einstein Toolkit or CarpetX as part of your thesis work* *between 1 August 2025 and 31 July 2026* it would be great if you could let me know *by 10 July 2026* (ideally also incl. the degree obtained / program type). Best wishes Helvi --------------------------------------------- Dr. Helvi Witek Associate Professor Department of Physics University of Illinois at Urbana-Champaign 247 Loomis Lab 1110 W Green St Urbana, IL 61801 ---------------------------------------------

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meeting minutes for 2026-07-02
by Roland Haas 02 Jul '26

02 Jul '26

Present: Roland, Steve, Peter, Deborah, Lucas, Maxwell, Zach, Cheng-Hsin, Yosef Chair: Zach Minutes: Roland ET release ========== * BBH gallery example test for code changes: no update yet * TwoPuncturesX: no vote yet * Steve working on acceptance emails * Stampede 3 is still being worked on, Steve will try and help out * there is an outstanding pull request for Delta that is needed after a recent update, Cheng-Hsin and Roland to coordinate * Lucas / Steve will set up on Expanse and run the testsuite * Peter re-ran tests on sunrise, 3 remaining failures * Steve found that changes are needed to compiled on Fedora and QueenBee ** will report back, likely not before the release Tickets transition to GitHub ============================ * will get started next week, Zach and Roland are signed up Code transition to GitHub ========================= * no update * Zach would like to reach out to people who self-host to move thorns into ET owned repos, especially for bitbucket repos SPEC inclusion ============== * Steve and Roland had to get back to SPEC team about performance Unanswered questions ==================== * Abderrahim El Khou is looking for collaborations to learn how to use ET: http://lists.einsteintoolkit.org/pipermail/users/2026-June/009972.html Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://pgp.mit.edu .

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 01 Jul '26

01 Jul '26

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 users＠einsteintoolkit.org 29 Jun '26

29 Jun '26

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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Collaboration / Peer-learning on Einstein Toolkit & GRMHD Simulations
by Abderrahim El Khou 28 Jun '26

28 Jun '26

Hi everyone, I hope this email finds you well. I am a PhD student working on computational astrophysics, specifically focusing on General Relativistic Magnetohydrodynamics (GRMHD) simulations using the Einstein Toolkit. As I am currently advancing through my research and setting up my simulation pipelines, I am looking to connect with a fellow PhD student or researcher working in the same field. My goal is to find a peer with whom I can collaborate closely—sharing insights, troubleshooting code, analyzing HDF5 outputs, and optimizing simulation setups. Ideally, we can combine our efforts to speed up the learning curve, solve technical challenges together, and work toward co-authoring and publishing joint papers. If you are working on GRMHD within the Einstein Toolkit ecosystem and are interested in learning together and collaborating on research outcomes, please feel free to reach out to me directly at " abderrahimelkhou00(a)gmail.com". Looking forward to connecting with the community! Best regards, *Abderrahim El Khou* PhD Student in Physics High Energy Physics Laboratory, Rabat, Morocco

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Meeting minutes for 06/25/26
by Lucas Timotheo Sanches 25 Jun '26

25 Jun '26

Attendees: Lucas (minutes), Yosef, Roland, Noora, Peter, Steve (chair),Beyhan, Nikolai, Johnny Tsao. # Review of the ET 2026 Summer School. - It was held last week at UIUC. - Helvi thanks all local organizers and members of the scientific and organized comite. - 40 people in person, 30-40 people online. - Mix of invited talks and lectures, about 30 minutes each. - Tutorials on CarpetX and the ETK. - Tutorial on Spectre. - Tutorial server was at capacity, which is good, this means good engagement. - We had sessions on different NR codes, - We had talks on career paths outside of academia. - The UIUC organizers will send out emails to presenters asking for permissions for publishing the talk videos. - Next summer school: Organized by Zach Etienne, University of Idaho, summer 2027 - Helvi suggests we have more discussion on using LLMs for NR. - Helvi suggests we distribute short talks by early career scientists better throughout the day. - Lucas comments he likes having tutorials on different codes and how to use them. - Helvi and Roland emphasize for the seniors to reach out to the younglings and talk to them. They suggest we spread out the seniors and the younglings to go out to lunch, for instance, so there can be networking and conversations. - Noora said there was good feedback on having different code presentations. - Beyhan says that presenters should probably have the data ready when presenting. Roland says we could give users complete notebooks, with the notebook output (not final data output) so that users can read them off as presentations are going. - Helvi suggests that we recommend presenters to have backup data, with complete results. Steve agrees. - Roland suggests we give the presenter some special slurm powers, so that they can actually run their demos and not get blocked by the students on the queue. - Beyhan suggests including some of the features that we don't have on the ETK from other codes. # ET_2026_05 release - There is now a release announcement. - Steve remarked that the list may be incomplete because he forgot to treat the NRpy repo differently, possibly excluding contributors from there. - Roland pointed out that it is not clear what some of the names have contributed. Steve says he will review his Claude procedure for including names. - Beyhan points out DIRAC/Cosma 8 is missing among supported machines. ## Gallery runs - Deborah is seeing some issues when running the GW150914 gallery example. The black holes shot to the side, instead of orbiting. Steve believes he knows the cause, which is related to the way that TwoPunctures handles and updates its parameters. His unification of TwoPunctures and TwoPuncturesX have introduced this issue. Yosef suggests adding a regression testing to the suite to make sure it is caught. Steve agrees. - Noora says her example is running. ## Test suite results -`advanced_features` failing on Anvil and Sunrise - Peter says he will rerun on sunrise. - Zach says he has identified an issue in Nrpy elliptic and Leo is already on it. - Noora says that she will provide the testsuite results for Frontera shortly. She reports two failing tests, `SBH_AxiDilHairID_test (from AxiDil_Evol)` and `sphere_pugh_ppm (from Hydro_InitExcision)` ## Inclusion votes - CanudaX voted YES for inclusion. - Cottonmouth voted YES for inclusion. ## Unanswered questions on the mailing list - None that need responses

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evolving flat boundary conditions
by Ryn Grutkoski 25 Jun '26

25 Jun '26

Hello, I am trying to do a cosmology simulation project using Cactus. For this project, I'm evolving an expanding homogeneous fluid in a box (FLRW spacetime), and I would like to use flat boundary conditions. I've attached the par file I am currently using. However, when I run this, the boundary cells do not seem to update at each time step to match the current value of the grid cells on the edge, as seen in this plot of the second time step output: [image: image.png] Is there a way to make the the boundary cells be updated at each time step according to the evolution of the edge of the grid? Thank you, Ryn -- Ryn Grutkoski *they/them/theirs*

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Question about error of CCTKi_SetParameter
by MAKINO Taiki 25 Jun '26

25 Jun '26

Dear Einstein Toolkit Team I am a new Einstein Toolkit user and have a simulation error. I encountered an error related to activating Multipole. Its error message is following: WARNING level 0 from host hubble process 22 in thorn Cactus, file /data/usr/Cactus/configs/sim/build/Cactus/main/SetParams.c:93: -> CCTKi_SetParameter: Error at line 41 in parameter file /data/usr/sim_Result/test_BNS_GW6/output-0000/test_BNS_GW.par while activating thorns I compared the parameters of Multipole in my par file with those of the example file: https://einsteintoolkit.org/gallery/bhns/bhns_gw230529.par However, I could not find any significant difference. In addition, I also previously encountered same errors related to activating Trigger and TerminationTrigger and dealt with these by commenting out. But I’m not sure why these errors occurred. I have attached my .par file to this email. I would appreciate any advice. Thank you for your time and assistance. Best regards, Taiki Makino Graduate School of Science, Nagoya University makino.taiki.g6(a)s.mail.nagoya-u.ac.jp<mailto:makino.taiki.g6@s.mail.nagoya-u.ac.jp> 取得 Outlook for Mac<https://aka.ms/GetOutlookForMac>

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 24 Jun '26

24 Jun '26

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