Abstract
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. Program summaryProgram Title: QTraj 1.0CPC Library link to program files:https://doi.org/10.17632/34hbsb6pzy.1Developer's repository link::https://bitbucket.org/kentphysics/qtraj-fftwLicensing provisions:: GPLv3Programming language:: CNature of problem:: Solution of the Lindblad equation for evolution of the heavy-quarkonium reduced density matrix in a quark-gluon plasma.Solution method:: We use the quantum trajectories algorithm to solve the Lindblad equation.
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