A1 Journal article (refereed)
Conserved energy–momentum tensor for real-time lattice simulations (2024)
Boguslavski, K., Lappi, T., Peuron, J., & Singh, P. (2024). Conserved energy–momentum tensor for real-time lattice simulations. European Physical Journal C, 84(4), Article 368. https://doi.org/10.1140/epjc/s10052-024-12725-6
JYU authors or editors
Publication details
All authors or editors: Boguslavski, K.; Lappi, T.; Peuron, J.; Singh, P.
Journal or series: European Physical Journal C
ISSN: 1434-6044
eISSN: 1434-6052
Publication year: 2024
Publication date: 08/04/2024
Volume: 84
Issue number: 4
Article number: 368
Publisher: Springer Science and Business Media LLC
Publication country: Germany
Publication language: English
DOI: https://doi.org/10.1140/epjc/s10052-024-12725-6
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/94619
Web address of parallel published publication (pre-print): https://arxiv.org/abs/2312.02726
Abstract
We derive an expression for the energy–momentum tensor in the discrete lattice formulation of pure glue QCD. The resulting expression satisfies the continuity equation for energy conservation up to numerical errors with a symmetric procedure for the time discretization. In the case of the momentum conservation equation, we obtain an expression that is of higher accuracy in lattice spacing (O(a2)) than the naive discretization where fields in the continuum expressions are replaced by discretized counterparts. The improvements are verified by performing numerical tests on the derived expressions using classical real-time lattice gauge theory simulations. We demonstrate substantial reductions in relative error of one to several orders of magnitude compared to a naive discretization for both energy and momentum conservation equations. We expect our formulation to have applications in the area of pre-equilibrium dynamics in ultrarelativistic heavy ion collisions, in particular for the extraction of transport coefficients such as shear viscosity.
Keywords: particle physics; quantum chromodynamics; simulation
Contributing organizations
Related projects
- Yoctosecond imaging of QCD collectivity using jet
observables’ — ‘YoctoLHC’- Niemi, Harri
- European Commission
- The strong interaction at the frontier of knowledge: fundamental research and applications- STRONG -2020
- Lappi, Tuomas
- European Commission
- Center of Excellence in Quark Matter
- Lappi, Tuomas
- Research Council of Finland
- Frontiers of high energy QCD
- Lappi, Tuomas
- Research Council of Finland
Ministry reporting: Yes
VIRTA submission year: 2024
Preliminary JUFO rating: 2