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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 02 Mar '26

02 Mar '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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Minutes Feb 26, 2026
by Wallin, Nikolai (wall5948＠vandals.uidaho.edu) 26 Feb '26

26 Feb '26

Present: Nikolai, Peter, Steven, Beyhan, Deborah, Johnny, Lucas, Maxwell, Noora, Rahim, Roland, Zac ET release ========== * All gallery runners are assigned * we have reviewers for the thorns * Zac updated BHaHAHA Peter should update before continuing review. A tool for coding ============== *Steven would like to advocate for a tool he has made Cactus IDE *pip install git+https://github.com/stevenrbrandt/cactus_ide.git Lucas endorsed Paper on reprimand almost done ========================== * Should add fuka and boost available as external library Emails and tickets ================== * No new emails *Multipatch support in NewRadX https://bitbucket.org/einsteintoolkit/tickets/issues/2921/multipatch-suppor… Lucas is trying to make it Multipatch agnostic. Its opt in, ready for review. *Cactus: Fixed arg list too long error. https://bitbucket.org/einsteintoolkit/tickets/issues/2908/cactus-fixed-arg-… Waiting for Max to finish testing suggestions * CarpetX: Add option to exclude boundaries in 1D tsv output https://bitbucket.org/einsteintoolkit/tickets/issues/2910/carpetx-add-optio… * 2914 should be closed * Inconsistent computation of the volume form in Coordinates (llama) between Thornburg04/13 and default behavior https://bitbucket.org/einsteintoolkit/tickets/issues/2912/inconsistent-comp… No response from authors * provide (historical) tar archives for each ET release https://bitbucket.org/einsteintoolkit/tickets/issues/2673/provide-historica… Roland will upload what he has. Missing 3 They will be bitbucket downloads off the www repository * BHNS with Elliptica: Assertion `all(offset == other.offset)' failed bitbucket.org/einsteintoolkit/tickets/issues/2899/bhns-with-elliptica-asser… Only seen on Marenostrom * have pkg-config code path in `find_lib` set `FOO_RAW_INC_DIRS` and `FOO_RAW_LIB_DIRS` https://bitbucket.org/einsteintoolkit/tickets/issues/2899/bhns-with-ellipti… Compiler error. Hdf5 found but cant find includes. Roland would like it reviewed An aside ======== Zac suggests we mark tickets in the system as having been discussed and invite ticketers to attend a telecon so we can have more communication with them. *CarpetX: interpolation with z-reflection symmetry only works for Psi4 https://bitbucket.org/einsteintoolkit/tickets/issues/2899/bhns-with-ellipti… Came up in recent calls about waveform extractions. Should not be to difficult. Update McLachlan ??? Not sure what ticket this was Peter will address this next week

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 25 Feb '26

25 Feb '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 23 Feb '26

23 Feb '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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meeting minutes for 2026-02-19
by rhaas＠phas.ubc.ca 19 Feb '26

19 Feb '26

Present: Roland, Peter, Ameen Ahsen, Keith, Lucas, Beyhan, Cheng-Hsin, Max, Nikolai, Noora, Zach, Johnny, Steve ET release ========== * Beyhan asked about locations of repositories for inclusions, has created tickets for each inclusion * Lucas inquired about process for including generated code ** Roland reports that generated code is reviewed ** suggests to include a "Makefile" that can re-generate the code ** McLachlan or WeylScal4 may be good examples to look at Test runners ------------ * still need test runners for expanse and supermuc in the release details document * Lucas may be able to provide an account for expanse proposed inclusions ------------------- * have reviewers for all inclusions * no action needed right now Emails and tickets ================== * range error https://lists.einsteintoolkit.org/pipermail/users/2026-February/009877.html Roland is looking into this, but cannot right now reproduce with a current ET release. Will go back to release used by Jordan to see if this shows the error. * loss of convergence http://lists.einsteintoolkit.org/pipermail/users/2026-February/009879.html Miguel has created a ticket: https://bitbucket.org/einsteintoolkit/tickets/issues/2920 * no specific actions for tickets. New tickets exists for new contributions. * Facebook photo for ET page: https://bitbucket.org/einsteintoolkit/tickets/issues/2914/update-cover-phot… Steve and Johnny are in contact to update the photo * no updates on https://bitbucket.org/einsteintoolkit/tickets/issues/2912/inconsistent-comp… * no updates on https://bitbucket.org/einsteintoolkit/tickets/issues/2673/provide-historica… Roland still working on producing the missing 3 release tar balls * Roland still looking into https://bitbucket.org/einsteintoolkit/tickets/issues/2899/bhns-with-ellipti… is a Carpet issue, has had not time yet to fully debug, but has access to MN5 * no updates but agreement that names are too generic on https://bitbucket.org/einsteintoolkit/tickets/issues/2907/arith-uses-very-g… * no updates on tickets up for review 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 18 Feb '26

18 Feb '26

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Loss of convergence with subcycling in time
by Miguel Zilhão 17 Feb '26

17 Feb '26

hi all, we've recently added the option to compute the Gauss constraint in the ProcaEvolve thorn (https://bitbucket.org/canuda/proca/src/experimental_miguel/ProcaEvolve/) and we were surprised to see that, even for very small evolutions of a simple (unperturbed) charged black hole, this constraint violation does not converge. of course everything is converging just fine at t=0, but once the evolution starts, convergence is lost really quickly. after experimenting with different things, i think i've narrowed the issue down to the subcycling in time. i've attached some plots as well as the corresponding parameter files. these plots are not convergence tests, it's just what i'm observing with and without subcycling in time (everything else is the same as you can see from the parfiles). these are evolutions for a single charged BH, with Q=0.2. in one of the parfiles (LeanBSSN_RN_Q0.2_nosubcycl_hf40_202509.par) all timelevels update at the same rate with Carpet::time_refinement_factors = "[1, 1, 1, 1, 1, 1, 1]" for the other parfile (LeanBSSN_RN_Q0.2_hf40_202509.par), all timelevels update at the same rate *except* the two inner ones. for the "base" grid functions, i see no noticeable difference insofar as i've checked, but for the Gauss constraint violation the results are very different as you can see from the plots attached: - in the gc_x_RN_nosubcycl.pdf plot, everything looks fine - in the gc_x_RN_subcycl.pdf case, notice how a lot of noise propagates from the two inner refinements levels -- the ones that updated more frequently than the rest. the problem is that this noise is not contained in the buffer region (if it was, we'd be fine), but propagates out, contaminates the rest of the grid, and totally ruins any convergence study. actually a similar thing also happens for the hamiltonian constraint -- plots also attached (hc_x_RN_nosubcycl.pdf, hc_x_RN_subcycl.pdf) -- but in this case the effect is smaller and it doesn't spoil convergence studies. so i was wondering whether this is at all expected and/or if there are some parameters or setting that we may have overlooked? thanks, Miguel

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 16 Feb '26

16 Feb '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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Meeting minutes for 2026-02-12
by keithdow＠keithdow.net keithdow＠keithdow.net 12 Feb '26

12 Feb '26

Present: Peter Diener, Lucas Timotheo Sanches, Noora Ghadiri, Steven R. Brandt Roland Hass, Bing-Jyun Tsao, Keith Dow, Beyhan, Deborah Ferguson, Nikolai Wallin Zach Etienne, Cheng-Hsin Cheng. # Hypatia release - Steve has a wiki page with google docs for tracking. - Thorn reviewers were identified. - Bhahaha reviewer Peter. - CanudaX reviewer Lucas with Beyhan helping. - Cotton Mouth reviewer Zach with Deborah helping. - CapryX Lucas champion with Roland to possibly review. # Unanswered Questions - Miguel needs to file a bug report about his issues with a charged black hole. # Tickets: - 2914: The suggestion is to use the group photo from the Austin meeting.

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Meeting minutes for 2026-02-12
by Lucas Timotheo Sanches 12 Feb '26

12 Feb '26

Present: Peter Diener, Lucas Timotheo Sanches, Noora Ghadiri, Steven R. Brandt Roland Hass, Bing-Jyun Tsao, Keith Dow, Beyhan. # Hypatia release - Steve says in good shape and On track. - Thorn reviewers are still needed. - Steve says we should try to run the code generators early on. - Peters has already promised to review Bhahaha. # Spec benchmark - The spec benchmark is getting ready for final steps of the release of the benchmark. - They are looking for stories about the toolkit and if we learned something about it - Steve asks for that, the community to provide those. Steve says he will have the release timeline ready by the next call # Dates for the UIUC summer workshop. Next ETK meeting will be in UIUC. Tentative dates are June 15th - 18th. # Mailing list - Loss of convergence with subcycling in time (Carpet): Miguel should file a bug report, and if he wants to dive in atm, it would be good. We can also offer help. Roland will reply and ask him to do so. # Tickets: - 2914: Collect people's existing photos. - 2912: Volume forms are not computed correctly for different coordinate systems. Roland has contacted Llama devs. but has not heard back from them. - 2898: No one reviewed it yet. - 2673: Roland will try to construct. - 2910: Lucas has defended it, but Roland does not like it. We have voted it to give it at least a review chance. - 2908: Lucas had no time to look into it. - 963: Peter promises that by June there will be updates

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