QTRAJ 1.0: A Lindblad equation solver for heavy-quarkonium dynamics

Journal Article · 24 December 2021 · Computer Physics Communications

DOI: https://doi.org/10.1016/j.cpc.2021.108266 · OSTI ID:1977047

Ba Omar, Hisham ^[1]; Escobedo, Miguel Ángel  ^[2]; Islam, Ajaharul ^[3]; Strickland, Michael  ^[3]; Thapa, Sabin  ^[3]; Vander Griend, Peter ^[4]; Weber, Johannes Heinrich  ^[5]

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1. Kent State University, Kent, OH (United States); OSTI
2. University of Santiago de Compostela, Galicia (Spain)
3. Kent State University, Kent, OH (United States)
4. Technische University, Munich (Germany)
5. Humboldt University of Berlin (Germany)

Here we introduce an open-source package called QTraj that solves the Lindblad equation for heavy-quarkonium dynamics using the quantum trajectories algorithm. The package allows users to simulate the suppression of heavy-quarkonium states using externally-supplied input from 3+1D hydrodynamics simulations. The code uses a split-step pseudo-spectral method for updating the wave-function between jumps, which is implemented using the open-source multi-threaded FFTW3 package. This allows one to have manifestly unitary evolution when using real-valued potentials. In this paper, we provide detailed documentation of QTraj 1.0, installation instructions, and present various tests and benchmarks of the code.

• Research Organization: Kent State University, Kent, OH (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP); Xunta de Galici; European Union; Spanish Research State Agency; European Research Council; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); German Research Foundation (DFG)
• Grant/Contract Number: SC0013470
• OSTI ID: 1977047
• Journal Information: Computer Physics Communications, Journal Name: Computer Physics Communications Journal Issue: C Vol. 273; ISSN 0010-4655
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English