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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 02 Jun '25

02 Jun '25

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 2025-05-29
by Roland Haas 29 May '25

29 May '25

Present: Steve, Deborah, Roland, Keith, Leo, Johnny, Liwei, Maxwell Einstein Toolkit release ======================== * Maxwell will send out announcement just after the call * Steve reminds the release managers to update the docs and release process notes * testsuite runs are only present for Anvil, DB1, Delta, Expanse, Frontera ** failures of TOVola on all tested clusters, Leo and Roland will reach out to David Boyer * Steve volunteers to handle the next release, Roland points out that Zach also volunteered to handle one release US Summer School ================ * titles are still missing for many talks, Johnny will reach out to speakers * Steve will present the getting started with the ET tutorial * 1.5hrs per invited speaker, more if needed for the tutorial * some speakers still need to verify their proposed slot * funding situation for travel grants is being sorted out, should contact the admin person of site funding travel if have any question * there is a reduced number of participants compared to initial estimates * for recordings of talks, can either upload to site-local YouTube channel then link in ET playlists or use ET channel to upload (Roland, Frank, Steve (?) can add members to the ET channel) * there will not be an organized outing, but Wed afternoon is off for visitors to interact on their own or explore Austin Open tickets ============ * https://bitbucket.org/einsteintoolkit/tickets/issues/2871 "EOS_Omni's nuceos code used int to hold hid_t values" is a wrong type, fix is known and quick. This should actually make tabulated EOS fail with new enough HDF5. * Steve suggests to add LD_OPENMP_FLAGS to generic.cfg and other option lists. This flag is new and introduced to avoid passing CXXFLAGS to the linker. Roland says that there should be fallback defaults, but they may not trigger if one sets other LD options. Steve does not set those, will point Roland to how to reproduce this on tutorial server. * https://bitbucket.org/einsteintoolkit/tickets/issues/2848 "Updates to FLRWsolver" is mostly the inclusion ticket for the release. Some code that was added shortly before the release to work around test failures, but should be cleaned up as pointed out by the reviewer (Zach). Any other topics ================ * Steve was contacted about presenting at a Perl conference in Austin July 3/4, looking for interested people * this would include a paper (CS-like, attached to a conference) * registration deadline is July 1 * https://www.papercall.io/perlcommunity 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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Re: [Users] PAX/CE Symposium at University of Illinois Urbana-Champaign, June 30 – July 3, 2025 -- registration open until 31 May 2025
by Helvi Witek 29 May '25

29 May '25

Dear Colleagues, The 10th Physics and Astrophysics at the eXtreme workshop (PAX X) and the 3rd Cosmic Explorer Symposium will be held jointly at the University of Illinois Urbana-Champaign from 30 June – 3 July 2025. Please see details below. You can still register until Saturday, 31 May 2025, 11:59 pm CDT, here: https://publish.illinois.edu/pax-xcesy/registration We look forward to welcoming you in Urbana-Champaign. 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 --------------------------------------------- On 1/24/25 4:44 PM, Helvi Witek wrote: > Dear Colleagues, > > The 10th Physics and Astrophysics at the eXtreme workshop (PAX X) and > the 3rd Cosmic Explorer Symposium will be held jointly at > the University of Illinois Urbana-Champaign from *30 June – 3 July > 2025*. The Cosmic Explorer Symposium will bring together the community > to discuss important aspects of the design and operations of the > Cosmic Explorer gravitational-wave observatories, covering both > observational and instrument science. The PAX-X workshop will explore > how the ongoing and upcoming observations of gravitational and > electromagnetic waves can help us understand physics at the extreme — > strong gravitational fields, dark matter, nuclear physics, cosmology, > and multimessenger astrophysics. > > Panels will be organized around a small number of presentations to > identify important areas for research and foster discussions and > community feedback. > > The registration is now open and will remain open*until May 1, 2025*. > > https://publish.illinois.edu/pax-xcesy/registration* > > Important: The maximum number of participants is 200. There is a > registration fee of $61, and an optional fee of $55 to attend the > conference dinner. > > *We look forward to welcoming you in Urbana-Champaign. > > Best wishes, > Helvi Witek > > On behalf of the organizing committee, > > LOC: Hector O. Silva, Mateus Reinke Pelicer, Antonios Tsokaros, Helvi > Witek, Deanna Frye. > SOC: Nils Andersson, Stefan Ballmer, Lisa Barsotti, Emanuele Berti, > Alessandra Corsi, Paul Fulda, Anuradha Gupta, Jan Harms, Carl-Johan > Haster, Joey Key, Lionel London, David Ottaway, Sheila Rowan, > Bangalore Sathyaprakash, Hector O. Silva, Antonios Tsokaros, Helvi Witek.

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The Thirtieth Release of the Einstein Toolkit
by Rizzo, Maxwell Anthony-Asher 29 May '25

29 May '25

# Release Announcement We are pleased to announce the thirtieth release (code name ["Martin D. Kruskal"](https://en.wikipedia.org/wiki/Martin_David_Kruskal)) of the Einstein Toolkit, an open-source, community-developed software infrastructure for relativistic astrophysics. The major changes in this release include: One new thorn has been added: * CCE_Export -- This thorn provides output support for data to be used in the ["SpECTRE Cauchy-characteristic evolution"](https://spectre-code.org/tutorial_cce.html) code to extract waveforms at infinity. Updated thorns: * CarpetX -- Further updates and new functionality. * Derivs -- Add support for 6th and 8th order accurate finite differencing. * FLRWSolver -- This thorn provides cosmological initial conditions based on a Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime, either with or without small perturbations. Along with one new gallery example: * Black-hole hair in axi-dilaton gravity -- Evolving a single black hole under modified axi-dilation gravity. In addition, bug fixes accumulated since the previous release have been included, as well as stability and optimization improvements through Simfactory. The Einstein Toolkit is a collection of software components and tools for simulating and analyzing general relativistic astrophysical systems. It builds on numerous software efforts in the numerical relativity community, including codes to compute initial data parameters, the spacetime evolution codes Baikal, lean_public, and McLachlan, analysis codes to compute horizon characteristics and gravitational waves, the Carpet AMR infrastructure, and the relativistic (magneto)hydrodynamics codes GRHayLHD, GRHayLHDX, GRHydro, and IllinoisGRMHD. Data analysis and post-processing are handled by the kuibit library. The Einstein Toolkit also contains a 1D self-force code. For parts of the toolkit, the Cactus Framework is used as the underlying computational infrastructure, providing large-scale parallelization, general computational components, and a model for collaborative, portable code development. The Einstein Toolkit uses a distributed software model. Its different modules are developed, distributed, and supported either by the core team of Einstein Toolkit Maintainers or by individual groups. Where modules are provided by external groups, the Einstein Toolkit Maintainers ensure quality control for modules included in the toolkit and help coordinate support. The Einstein Toolkit Maintainers currently involve staff and faculty from five different institutions and host weekly meetings that are open to anyone. Guiding principles for the design and implementation of the toolkit include: open, community-driven software development; well thought-out and stable interfaces; separation of physics software from computational science infrastructure; provision of complete working production code; training and education for a new generation of researchers. For more information about using or contributing to the Einstein Toolkit, or to join the Einstein Toolkit Consortium, please visit our web pages at http://einsteintoolkit.org, or contact the users mailing list users(a)einsteintoolkit.org. The Einstein Toolkit is primarily supported by NSF 2004157/2004044/2004311/2004879/2003893/2114582/2227105 (Enabling fundamental research in the era of multi-messenger astrophysics). The Einstein Toolkit contains about 400 regression test cases. On a large portion of the tested machines, almost all of these tests pass, using both MPI and OpenMP parallelization. ## Contributors Among the many contributors to the Einstein Toolkit and to this release in particular, important contributions to new and existing components were made by the following authors: * Cheng-Hsin Cheng * David Boyer * Deborah Ferguson * Erik Schnetter * Gabriele Bozzola * Hayley J. Macpherson * Ivan Markin * Leonardo Werneck * Liwei Ji * Lucas T. Sanches * Maxwell Rizzo * Miguel Zilhao * Peter Diener * Roland Haas * Samuel Cupp * Samuel Tootle * Steven R. Brandt * Terrence P. Jacques * Wolfgang Tichy * Yosef Zlochower * Yumeng Xu * Zachariah Etienne ## How to upgrade from Cannon Release (ET_2024_11) To upgrade from the previous release, use GetComponents with the new thornlist to check out the new version. See the Download page (http://einsteintoolkit.org/download.html) on the Einstein Toolkit website for download instructions. The SelfForce-1D code uses a single git repository; thus, using git pull; git checkout ET_2025_05 will update the code. To install Kuibit, do the following: pip install --user -U kuibit==1.5.0 ## Machine notes ### Supported (tested) machines include: * Debian, Ubuntu, Fedora, Mint, OpenSUSE, and macOS installations with dependencies installed as prescribed in the official installation instructions * Anvil * Deep Bayou * Delta * Expanse * Frontera * Queen Bee 3 and 4 * Stampede 3 * Sunrise * Supermike ### Note for individual machines: * TACC machines: defs.local.ini needs to have `sourcebasedir = $WORK` and `basedir = $SCRATCH/simulations` configured for this machine. You need to determine $WORK and $SCRATCH by logging in to the machine. All repositories participating in this release carry a branch ET_2025_05 marking this release. These release branches will be updated if severe errors are found. ## The "Martin D. Kruskal" Release Team on behalf of the Einstein Toolkit Consortium (2025-05-29) * Maxwell Rizzo * Roland Haas * Bing-Jyun Tsao * Deborah Ferguson * Hayley J. Macpherson * Leonardo Werneck * Lucas Timotheo Sanches * Peter Diener * Steven R. Brandt * Zachariah Etienne May 29, 2025

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Meeting Minutes for 2025-05-22
by Leo Rosa Werneck 29 May '25

29 May '25

Hi all, Here are the minutes from last week’s meeting. Cheers, Leo Present: Zach (Chair), Leo (Minutes), Maxwell, Peter, Deborah, Keith, Lucas, Roland, Steve, Johnny *ET Release* - Branches for the new release are being created. - FLRWSolver: Unit tests are not passing, and it seems like it is not simply a matter of adjusting the tolerances, but the fact it uses a Fortran random generator function that produces different data depending on the system/compiler. While a quick fix is being provided, a long-term solution is to call one of C++ STL's well-specified random number generators. - Deborah worked on a new way to produce files with different extensions for the test suite. Roland and Steve will review. - Gallery examples: * BBH: completed. * TOV: completed. * Axi-Dilaton: completed. * BNS: pending, will be done today. * Multi-Patch Wave Equation: Lucas is dealing with compilation issues. - BHaHAHA: while its inclusion was postponed to next release, Zach announced the paper will be out in the arxiv today. *Upcoming NA ET Summer School (Austin, TX)* - Website: https://indico.global/event/14071/ - Funding is mostly sorted out, participants should be notified soon. - Steve suggests reaching out to universities for future meetings that would willing to host us and donate rooms for the meeting to happen. They could be chosen strategically to minimize traveling hassles. *Open Tickets & ready for review* - #2855: In principle NoiseX works, but Lucas is busy with workshop. - #2862: Ready to review, simple parfile change. - #2860: Peter tested it and found instabilities. - #2846: Steve will review. ------ Leonardo R. Werneck, Ph.D. Postdoctoral researcher Office EP 314 | Department of Physics | University of Idaho 875 Perimeter Dr. MS 0903 Moscow, ID 83844-0903, USA leonardo(a)uidaho.edu <mailto:leonardo@uidaho.edu> https://leowerneck.github.io <https://leowerneck.github.io/>

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 28 May '25

28 May '25

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 26 May '25

26 May '25

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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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 21 May '25

21 May '25

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 21 May '25

21 May '25

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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Professorship for Relativistic Astrophysics, FSU Jena (Germany)
by Sebastiano Bernuzzi 19 May '25

19 May '25

Dear Colleague, The Department of Physics and Astronomy of the Friedrich Schiller University Jena (Germany) invites applications for a W3 (or W2 with tenure track to W3) professorship for Theoretical Physics - Relativistic Astrophysics starting in the summer semester 2026. The successful candidate is expected to have demonstrated broad expertise in scientific research and high competence in teaching in this subject area. We search for excellence in gravitational physics and relativity theory, with research interests in general relativistic astrophysics, gravitational waves and their sources, as well as mathematical and theoretical foundations of classical and modified gravity. With regard to technical expertise, a strong background in mathematical and/or numerical relativity is desired. A close collaboration with existing groups at the department is expected, especially with other theoretical research groups in the areas of theoretical physics, quantum field theory, astronomy and/or computational physics. These activities should be strengthened and expanded, in particular with respect to coordinated funding programs, while additional, new initiatives are welcome. Experience in grant acquisition and leadership in science management are required. Applications including cover letter, CV, research and teaching concepts, list of publications and acquired third-party funding should be submitted electronically to the University job portal ( https://berufungsportal.uni-jena.de/) no later than *July, 1st 2025*. See https://berufungsportal.uni-jena.de for the full text of the announcement. Please bring this opportunity to the attention of interested candidates. Thank you SB

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