Trac April 2026

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#2931: Claude AI edits to TwoPuncturesX
by Steven R. Brandt 27 Apr '26

27 Apr '26

#2931: Claude AI edits to TwoPuncturesX Reporter: Steven R. Brandt Status: new Milestone: Version: Type: bug Priority: major Component: Comment (by Steven R. Brandt): I say we leave it as is and wait for the clankers to become smart enough to figure it out. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2931/claude-ai-edits-t…

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#2929: GRHayLET/IllinoisGRMHD convert_IllinoisGRMHD_to_HydroBase schedule compatibility with VolumeIntegrals_*
by Leonardo Rosa Werneck 24 Apr '26

24 Apr '26

#2929: GRHayLET/IllinoisGRMHD convert_IllinoisGRMHD_to_HydroBase schedule compatibility with VolumeIntegrals_* Reporter: Maxwell Rizzo Status: new Milestone: ET_2026_05 Version: ET_2025_05 Type: bug Priority: major Component: EinsteinToolkit thorn Comment (by Leonardo Rosa Werneck): [PR #15](https://github.com/GRHayL/GRHayLET/pull/15) was merged. Please close this ticket if in fact issue was resolved. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2929/grhaylet-illinois…

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#2936: CarpetX tsv output does not append files
by Maxwell Rizzo 23 Apr '26

23 Apr '26

#2936: CarpetX tsv output does not append files Reporter: Maxwell Rizzo Status: new Milestone: Version: Type: enhancement Priority: minor Component: CarpetX CarpetX’s TSV output, excluding the norms/ files, does not append to a single file per group in the way Carpet’s ASCII output does. Instead, it creates one file per group per iteration: `<group>.it000000.<x/y/z>.tsv` for grid functions and arrays, and `<group>.it000000.tsv` for scalars. Appending subsequent iterations to the same file would make analysis and post-processing easier, while also reducing the amount of output files. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2936/carpetx-tsv-outpu…

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#2916: Include Cottonmouth
by Zach Etienne 23 Apr '26

23 Apr '26

#2916: Include Cottonmouth Reporter: Beyhan Karakaş Status: open Milestone: ET_2026_05 Version: Type: enhancement Priority: major Component: EinsteinToolkit thorn Comment (by Zach Etienne): Issues found (sorry for the uneven formatting): ``` Issue 1: Missing symmetrization in the conformal Ricci tensor inside the constraints/analysis block. Where the bug is In `fun_bssn_cons`, the code uses + Delta[uc] * Gammat[la, lb, lc] but in the BSSN Ricci decomposition the corresponding term is the symmetrized object Delta^c * Gammat_(ab)c which means (1/2) * Delta^c * Gammat_abc + (1/2) * Delta^c * Gammat_bac. Minimal fix Replace + Delta[uc] * Gammat[la, lb, lc] by + Rational(1, 2) * Delta[uc] * Gammat[la, lb, lc] + Rational(1, 2) * Delta[uc] * Gammat[lb, la, lc] Note that your own `fun_bssn_rhs` block already contains the correct symmetrized pair and therefore serves as an internal consistency check. ``` 2. bssnok.py ``` * Issue 2 - Severity high - Description of the error - The momentum-constraint matter source carries an extra factor of `w**2`. With `g_{ij} = (1 / w**2) * gt_{ij}`, one has `gamma^{ij} = w**2 * gt^{ij}`, but the conformal BSSN momentum constraint with free upper index uses `gt^{ij} * S_j`, not `gamma^{ij} * S_j`. The current code therefore overweights the source term by a factor of `w**2`. - Filename + line number(s) - Pasted file (filename not provided):638-648 - Original code snippet - fun_bssn_cons.add_eqn( MomCons[ua], + gt[ua, uc] * gt[ub, ud] * ( D(At[lc, ld], lb) - Gammat[uk, lc, lb] * At[lk, ld] - Gammat[uk, ld, lb] * At[lc, lk] ) + 6 * At[ua, ub] * cdphi[lb] - Rational(2, 3) * gt[ua, ub] * D(trK, lb) # Matter - 8 * pi * w**2 * gt[ua, ub] * S[lb] ) - Fixed code snippet. - fun_bssn_cons.add_eqn( MomCons[ua], + gt[ua, uc] * gt[ub, ud] * ( D(At[lc, ld], lb) - Gammat[uk, lc, lb] * At[lk, ld] - Gammat[uk, ld, lb] * At[lc, lk] ) + 6 * At[ua, ub] * cdphi[lb] - Rational(2, 3) * gt[ua, ub] * D(trK, lb) # Matter - 8 * pi * gt[ua, ub] * S[lb] ) - Confidence - 96% * Issue 3 - Severity low - Description of the error - The comments defining `Delta` are mathematically malformed. They describe the contraction with the wrong index pattern, which can mislead a reader into thinking `Delta^i` is built from `tilde gamma^{i,j} tilde Gamma^a_{ab}` or `tilde gamma^{ij} tilde Gamma^i_{jk}`. The correct definition is `Delta^i = tilde gamma^{jk} tilde Gamma^i_{jk}`. The executable code below the comments is correct; only the comments are wrong. - Filename + line number(s) - Pasted file (filename not provided):273-275 - Original code snippet - # \tilde{\gamma}^{i, j} \tilde{\Gamma}^a_{a b} # When \tilde{\Gamma}^{i} when it appears and its derivative are not needed, # the substitution \tilde{\Gamma}^{i} \rightarrow \tilde{gamma}^{ij} \tilde{\Gamma}^{i}_{jk} = \Delta^i - Fixed code snippet. - # \Delta^i = \tilde{\gamma}^{jk} \tilde{\Gamma}^i_{jk} # When \tilde{\Gamma}^{i} appears without derivatives, we replace it by # \Delta^i = \tilde{\gamma}^{jk} \tilde{\Gamma}^{i}_{jk} - Confidence - 99% ``` ``` Issue 4: linear_wave.py: File sets an unphysical default amplitude for the wave: amplitude = cottonmouth_linear_wave_id.add_param( "amplitude", default=1.0, desc="Linear wave amplitude" ) A << 1 for a valid linearized wave. ``` -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2916/include-cottonmou…

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#2928: New Simfactory Option
by Roland Haas 23 Apr '26

23 Apr '26

#2928: New Simfactory Option Reporter: Steven R. Brandt Status: new Milestone: Version: Type: enhancement Priority: major Component: SimFactory Changes (by Roland Haas): responsible: [] (was ) assignee: Steven R. Brandt (was ) -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2928/new-simfactory-op…

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#2935: Kuibit: Support CarpetX tsv output (1D GF/Array, Norm/Scalar)
by Maxwell Rizzo 23 Apr '26

23 Apr '26

#2935: Kuibit: Support CarpetX tsv output (1D GF/Array, Norm/Scalar) Reporter: Maxwell Rizzo Status: new Milestone: Version: Type: proposal Priority: minor Component: Changes (by Maxwell Rizzo): See issue on Kuibit's repository: https://github.com/Sbozzolo/kuibit/issues/49 To summarize the file output differences: Carpet text output was either per variable or per group `.asc` ASCII files. CarpetX text output currently is only per group `.tsv` TSV files. CarpetX only appends the output to the `norms/` files, all other output files (scalars, GFs, Arrays) get their own file per group per iteration (per axis where applicable). Lastly, the headers have changed, the CarpetX headers are a single line, as opposed to the multi-line Carpet headers. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2935/kuibit-support-ca…

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#2935: Kuibit: Support CarpetX tsv output (1D GF/Array, Norm/Scalar)
by Maxwell Rizzo 23 Apr '26

23 Apr '26

#2935: Kuibit: Support CarpetX tsv output (1D GF/Array, Norm/Scalar) Reporter: Maxwell Rizzo Status: new Milestone: Version: Type: proposal Priority: minor Component: See issue on Kuibit's repository: https://github.com/Sbozzolo/kuibit/issues/49 To summarize the file output differences: Carpet text output was either per variable or per group `.asc` ASCII files. CarpetX text output currently is only per group `.tsv` TSV files. CarpetX only appends the output to the `norms/` files, all other output files (scalars, GFs, Arrays) get their own file per group per iteration (per axis where applicable). Lastly, the headers have changed, the CarpetX headers are a single line, as opposed to the multi-line Carpet headers. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2935/kuibit-support-ca…

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#2173: Test "Poisson equation" example
by Beyhan Karakaş 23 Apr '26

23 Apr '26

#2173: Test "Poisson equation" example Reporter: Roland Haas Status: resolved Milestone: ET_2026_05 Version: development version Type: task Priority: major Component: EinsteinToolkit website Changes (by Beyhan Karakaş): status: resolved (was open) Comment (by Beyhan Karakaş): Thank you. Closed for Hypatia release. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2173/test-poisson-equa…

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#2175: Test "Single, stable neutron star" example
by Beyhan Karakaş 23 Apr '26

23 Apr '26

#2175: Test "Single, stable neutron star" example Reporter: Roland Haas Status: resolved Milestone: ET_2026_05 Version: development version Type: task Priority: major Component: EinsteinToolkit website Changes (by Beyhan Karakaş): status: resolved (was open) Comment (by Beyhan Karakaş): Closed for Hypatia release. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2175/test-single-stabl…

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#2175: Test "Single, stable neutron star" example
by Beyhan Karakaş 23 Apr '26

23 Apr '26

#2175: Test "Single, stable neutron star" example Reporter: Roland Haas Status: open Milestone: ET_2026_05 Version: development version Type: task Priority: major Component: EinsteinToolkit website Comment (by Beyhan Karakaş): For the testing in future please check the "tov_20260325.tar.gz" and upload only the required files for each run which are less than a MB in total. -- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2175/test-single-stabl…

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Trac April 2026