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Postdoctoral Position in Numerical Relativity (University of Idaho)
by Zach Etienne 08 Jan '26

08 Jan '26

Dear Einstein Toolkit Community, A postdoctoral position is available in the Department of Physics at the University of Idaho, focused on advancing numerical relativity methods for compact binary systems. *Apply here: https://uidaho.peopleadmin.com/postings/50495 <https://uidaho.peopleadmin.com/postings/50495>* The successful candidate will extend efforts such as the Einstein Toolkit, BlackHoles@Home, and the superB project to perform state-of-the-art simulations of compact binaries (e.g., binary black holes, binary neutron stars, and black hole–neutron star binaries). Broader goals include generating accurate predictions for gravitational-wave and multimessenger signals and exploring challenging regions of parameter space. *Required qualifications* - Ph.D. in Physics, Astrophysics, Applied Mathematics, Computer Science/Engineering, or a closely related field by the start date - Demonstrated research in numerical relativity, computational general relativity, or closely related computational physics - Experience with PDE solvers (elliptic and/or hyperbolic), numerical methods, and scientific software development - Proficiency in C/C++ and Python, with experience in HPC environments (e.g., MPI/OpenMP; GPU experience a plus) - Record of peer-reviewed publications appropriate to career stage Preferred qualifications - Strong written and oral scientific communication skills; ability to work independently and collaboratively - Commitment to reproducible research (version control, testing, documentation) - Experience generating binary black hole initial data (conformally flat/curved) on curvilinear/multipatch/multidomain/AMR grids - Experience with Einstein Toolkit, NRPy / NRPyElliptic, GRHayL, IllinoisGRMHD, or comparable NR/GRMHD codes - Background implementing/benchmarking radiation transport (neutrino or photon) in GR - Supercomputer workflows (e.g., Slurm/PBS), CI/testing, and contributions to open-source scientific software - Familiarity with gravitational-wave modeling and catalog/campaign paper authorship Compensation and appointment details - Pay range: $60,000 annually or higher, commensurate with experience - Full-time (FTE 1.0), Exempt, fiscal-year appointment - Continuation is contingent on funding - Background check required for finalists Application materials Please submit the following via the posting: https://uidaho.peopleadmin.com/postings/50495 - CV/Resume - Cover Letter / Letter of Application - Statement of Research - List of References University of Idaho The University of Idaho is located in Moscow, Idaho, in the Palouse region near the Washington state border, with easy access to nearby Pullman, WA. EEO statement: The University of Idaho is an equal employment opportunity employer, including veterans and individuals with disabilities. -Zach ----- Zachariah Etienne Prof. of Physics, U. of Idaho Adjunct Prof. of Physics & Astronomy, West Virginia U. https://etienneresearch.com https://blackholesathome.net

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 07 Jan '26

07 Jan '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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[New Thorn] PrimeResonance - A Discrete Kernel for Manifold Resonance
by Timothy Edgin 05 Jan '26

05 Jan '26

Dear Einstein Toolkit Community, I am writing to announce the release of *PrimeResonance*, a new Thorn developed to explore the intersection of number theory and field resonance within the Cactus framework. Project Overview: The PrimeResonance Thorn implements a discrete computational kernel that maps primorial moduli (P4, P5, P6, etc.) to continuous manifold rotations. This work bridges discrete number theory and continuous field physics, demonstrating that specific discrete phase mappings remain bounded and structurally consistent with the Fine Structure Constant ($\alpha^{-1}$) and the Golden Angle. *Repositories:* - Thorn Source Code: https://github.com/timtiminhous/Prime-Resonance-Thorn (Contains the CCL definitions and source implementation compatible with the Einstein Toolkit) - Mathematical Proofs (LEAN4): https://github.com/timtiminhous/ContinuityEngine (Contains the formal verification of the bridge theorem and kernel stability) License: This work is released under the PolyForm Noncommercial License 1.0. It is free for academic research, education, and non-commercial open source use. Commercial applications require a separate license. I welcome feedback from the community regarding the integration of this kernel into broader relativistic simulations. Best regards, Timothy Edgin Former Cybersecurity Architect / Independent Researcher Timothy Edgin- Senior Cybersecurity Consultant Architect of Polyadmin Incorporated CISSP 832-206-3481 https://polyadmin.com/ *https://www.credly.com/users/timothyedgin/badges <https://www.credly.com/users/timothyedgin/badges>* *https://www.linkedin.com/in/timothyedgin/ <https://www.linkedin.com/in/timothyedgin/>* [image: ArcSight Logger v7.x Certified Expert] This email communication may contain CONFIDENTIAL INFORMATION WHICH ALSO MAY BE LEGALLY PRIVILEGED and is intended only for the use of the intended recipients identified above. If you are not the intended recipient of this communication, you are hereby notified that any unauthorized review, use, dissemination, distribution, downloading, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by reply email, delete the communication and destroy all copies.

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 05 Jan '26

05 Jan '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 2025-12-18
by Steven Brandt 18 Dec '25

18 Dec '25

Present: Steve, Peter, Beyhan, Zach, Roland, Maxwell Rizzo, Deborah, Lucas Chair: Deborah To be included in the next release: - LSU: Cottonmouth - UIUC: CandudaX - Idaho: Bhahaha - Maxwell Rizzo: volume integral thorns for CarpetX (Zach will review) Names of previous releases are here: https://docs.einsteintoolkit.org/et-docs/Release_Details Time to start pondering new ones Testsuite runners: - Steve: LSU machines, some standard linuxes - Maxwell Rizzo: Anvil - Deborah: Stampede 3 - XSEDE machines? - New machines? Discussions on mailing list: - Miguel Zilhao asks about loss of convergence with Carpet We should follow up to find more details Evolved with Proca Tickets: - Remove TAGS='...' from interface.ccl (Roland) - Interpolator CACHES (Roland and Erik) - NewCGH field cctk_patch_is_cartesian (Roland) - Generic names of headers in CarpetX is problematic - Issue 2888: race condition, need a replicatable error

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 17 Dec '25

17 Dec '25

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Not found response
by Gal Shua Yehoshua-Abramskey 17 Dec '25

17 Dec '25

Hello, While trying to reach the tutorial server on https://etk.cct.lsu.edu/ I received a Not found page, could you help revive it? Thanks, Gal.

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meeting minutes for 2025-12-11
by Roland Haas 11 Dec '25

11 Dec '25

Present: Leo, Roland, Peter, Steve, Zach, Beyhan, Deborah, Johnny, Keith, Lucas, Nikolai Chair: Leo Minutes: Roland ET EU meeting 2025 discussion ============================= * Beyhan reported on numbers of attending participants * recordings and slides are available at https://sites.google.com/view/eetk25 * minutes of discussion will be added soon * next US meeting will be at UIUC * next EU meeting is TBD ET 2026 release =============== * Steve is chair * Roland is future chair * Beyhan agreed to help * Deborah agrees to help with gallery runs * Lucas volunteers to run gallery examples * Johnny agrees to run gallery * Roland mentions that BHNS gallery example should be in the making * Roland suggests that having a BNS example that is not using LORENE and GRHydro would be nice * Leo and Peter suggest that using FUKA as ID reader is not too expensive * Beyhan suggests that SGRID would offer more options for initial data ** Steve and Peter suggest reaching out to Wolfgang Tichy for an introduction Questions on the mailing list ============================= Older messages since from before US Thanksgiving * "Loss of convergence with subcycling in time" https://lists.einsteintoolkit.org/pipermail/users/2025-November/009815.html Steve is concerned about lack of convergence, Erik pointed out that full Christmas tree scheme must be used that does not use any interpolation in time at all * "Safe check of variable Coordinates::volume_form_state" https://lists.einsteintoolkit.org/pipermail/users/2025-November/009821.html Suggest to create a ticket since this seems to be a bug. Storage itself can always be checked via CCTK_VarDataPtr Tickets on list =============== * "BHNS with Elliptica: Assertion `all(offset == other.offset)' failed" https://bitbucket.org/einsteintoolkit/tickets/issues/2899/ . No progress, Roland now has access to MN5. * "CarpetX: interpolation with z-reflection symmetry only works for Psi4", https://bitbucket.org/einsteintoolkit/tickets/issues/2902 . Roland says this would be nice to have for upcoming release. * "NoiseX: Improve noise generation in CarpetX", https://bitbucket.org/einsteintoolkit/tickets/issues/2855 . Moved to top since Roland added comment based on Erik's observation that vertex centered grid double cover the last grid point * "CarpetX: Interpolator caches" https://bitbucket.org/einsteintoolkit/tickets/issues/2898 . Lucas is re-implementing so as to not use a cache but provide finer grained control to caller over stages (setup and interpolate) * "GetComponents: add support to set push_url in git" https://bitbucket.org/einsteintoolkit/tickets/issues/2896 Steve will review * "PUGH tries to free memory not allocated by malloc", https://bitbucket.org/einsteintoolkit/tickets/issues/2764 . No progress. * "Improve McLachlan accuracy", https://bitbucket.org/einsteintoolkit/tickets/issues/963 . Peter and Zach are still working on this. Any other business ================== * Roland mentioned prior efforts of transitioning Cactus codes to github and need to reach out to current owner of cactuscode github user name * Lucas brought up the issue that Perl is becoming less and less familiar to developers of Cactus code. Suggests to try and see if a transition to Python (3) maybe using a LLM to help it possible. Need to ensure that a common version of Python 3 is installed on all clusters. We will meet once more this year next week (Dec 18th), then skip Christmas day (25th) and New Year's day (1st). Next chair: Deborah Next minutes: Nikolai 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 10 Dec '25

10 Dec '25

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Changing Timestep Size at Recovery?
by Allen Wen (RIT Student) 10 Dec '25

10 Dec '25

Hello, Is there a clean way to change the timestep size in a Carpet simulation on recovery (eg. effectively making Time::dtfac steerable)? I am running into numerical instabilities late in a simulation and was wondering if reducing the dtfac would help. While I am using multiple refinement levels with subcycling, I can ensure all levels are aligned in time at this checkpoint if it helps. Thanks, Allen Wen

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