Binary neutron-star mergers with Whisky and SACRA: First quantitative comparison of results from independent general-relativistic hydrodynamics codes

Luca Baiotti; Masaru Shibata; Tetsuro Yamamoto

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Binary neutron-star mergers with Whisky and SACRA: First quantitative comparison of results from independent general-relativistic hydrodynamics codes

Luca Baiotti, Masaru Shibata, Tetsuro Yamamoto

General Relativity and Quantum Cosmology · Submitted 11 Jul 2010

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We find that the results produced by the two codes agree at a reasonable level, with variations in the different quantities but always at better than about 10%.

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arXiv ID1007.1754 (version 2)

Pith IDCM6CO46V, Pith's permanent record of this paper and its review

CitationLuca Baiotti, Masaru Shibata, Tetsuro Yamamoto. "Binary neutron-star mergers with Whisky and SACRA: First quantitative comparison of results from independent general-relativistic hydrodynamics codes." arXiv:1007.1754 (2010). https://pith.science/paper/CM6CO46V

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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,711 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.94 · states limitation 0.46 · human participants 0.01 · controlled comparison 0.15 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.81 · mentions code or data availability 0.03.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; show every role.

We present the first quantitative comparison of two independent general-relativistic hydrodynamics codes, the Whisky code and the SACRA code. We compare the output of simulations starting from the same initial data and carried out with the configuration (numerical methods, grid setup, resolution, gauges) which for each code has been found to give consistent and sufficiently accurate results, in particular in terms of cleanness of gravitational waveforms. We focus on the quantities that should be conserved during the evolution (rest mass, total mass energy, and total angular momentum) and on the gravitational-wave amplitude and frequency. We find that the results produced by the two codes agree at a reasonable level, with variations in the different quantities but always at better than about 10%.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We present the first quantitative comparison of two independent general-relativistic hydrodynamics codes, the Whisky code and the SACRA code.	contribution 1.00	0.93	0.09	asserted 0.99
s1	We compare the output of simulations starting from the same initial data and carried out with the configuration (numerical methods, grid setup, resolution, gauges) which for each code has been found to give consistent and sufficiently accurate results, in particular in terms of cleanness of gravitational waveforms.	method 0.99	0.90	0.04	asserted 0.96
s2	We focus on the quantities that should be conserved during the evolution (rest mass, total mass energy, and total angular momentum) and on the gravitational-wave amplitude and frequency.	method 0.77	0.64	0.03	asserted 0.76
s3	We find that the results produced by the two codes agree at a reasonable level, with variations in the different quantities but always at better than about 10%.	result 1.00	0.97	0.89	asserted 1.00

What kind of paper the classifier reports this is: simulation study 0.99 · evidence from simulation or computation 1.00.

What was examined, and what was not

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arXiv listing abstract v2

not examined

full text
figures and tables
references and citing sentences
relations to other papers

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P abstract

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S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

We present the first quantitative comparison of two independent general-relativistic hydrodynamics codes, the Whisky code and the SACRA code. We compare the output of simulations starting from the same initial data and carried out with the configuration (numerical methods, grid setup, resolution, gauges) which for each code has been found to give consistent and sufficiently accurate results, in particular in terms of cleanness of gravitational waveforms. We focus on the quantities that should be conserved during the evolution (rest mass, total mass energy, and total angular momentum) and on the gravitational-wave amplitude and frequency. We find that the results produced by the two codes agree at a reasonable level, with variations in the different quantities but always at better than about 10%.

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References

Forward citations

Cited by 8 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Rotating Neutron Star Migrations as a Standardized Test for 3+1 Numerical Relativity
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Rotating neutron star migrations follow constant-angular-momentum equilibrium sequences, with shock heating shifting endpoints to lower densities, and the process can serve as a standardized 3D numerical relativity test.
The error budget of binary neutron star merger simulations for configurations with high spin
gr-qc 2025-06 accept novelty 6.0 of 10

For highly spinning (chi=0.5) binary neutron stars, evolution code choice is the largest numerical waveform error, and current analytical models disagree with numerical relativity beyond that error after the stars touch.
High-Order Fully General-Relativistic Hydrodynamics: new Approaches and Tests
gr-qc 2013-12 conditional novelty 6.0 of 10

A high-order general-relativistic hydrodynamics code reaches about 2.8-order convergence in binary neutron star waveforms and an estimated 50-fold smaller phase error than a standard second-order code at the same resolution.
A comprehensive simulation framework for multi-modal kilonova observations from all-sky surveys
astro-ph.IM 2026-10 conditional novelty 5.0 of 10

A multimodal kilonova simulation pipeline produces survey-realistic light curves, spectra, and image pairs intended for training AI classifiers and parameter estimators.
Rotational properties of hypermassive neutron stars from binary mergers
gr-qc 2016-11 accept novelty 5.0 of 10

The rotation profile of hypermassive neutron stars formed in binary mergers is quasi-universal across equations of state: a slowly rotating uniform core plus an outer disk spinning down as r to the minus three-halves.

Show 3 more citing papers

Accuracy of numerical relativity waveforms from binary neutron star mergers and their comparison with post-Newtonian waveforms
gr-qc 2011-09 accept novelty 5.0 of 10

State-of-the-art numerical relativity waveforms from equal-mass binary neutron star mergers carry phase errors of about 0.13 rad at best, which fails standard data-analysis accuracy thresholds for most realistic detec...
Numerical relativity simulations of binary neutron stars
gr-qc 2011-04 accept novelty 5.0 of 10

The upgraded BAM code produces convergent binary neutron star inspiral waveforms, and Richardson extrapolation across three to four resolutions yields quantified phase and amplitude error bars, though the estimates de...
Numerical Relativity and Astrophysics
astro-ph.HE 2014-05 accept novelty 2.0 of 10

Numerical relativity now delivers quantitative predictions for compact binary mergers and core collapse, including remnant masses, spins, recoil velocities, and electromagnetic counterpart estimates.

How the literature uses it

5 arXiv papers cite this in 5 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 3 sentences without a confident label

Uses its method or tool 2 papers

The mathematical and numerical setup used for the simulations reported here is the same discussed in Refs. [ref] and presented in greater detail in other papers [ref] .

Rotational properties of hypermassive neutron stars from binary mergers · Mathematical and numerical setup · 1.00
The implementation of their fixed mesh refinement (except for the part dealing with the magnetic field) is based on that of the SACRA code [ref] , which had been quantitatively compared to the Whisky code [ref] several years ago in Refs. [ref] .

Binary Neutron Star Mergers and Short Gamma-Ray Bursts: Effects of Magnetic Field Orientation, Equation of State, and Mass Ratio · Comparison with Kiuchi et al 2014 · 0.86

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