Pre-equilibrium response code KøMPøST

Extracting the QGP medium properties, like shear or bulk viscosities, is the primary goal of heavy-ion research. However choice of initial conditions for the hydrodynamical evolution of the plasma is the main source of model uncertainties. Therefore the first principle modelling of initial gauge fields, or multi-parameter model-to-data fits have been very important for the progress of the field. However, until recently none of the approaches included the pre-equilibrium physics, which would naturally lead to hydrodynamical expansion of QGP.

In a series of works (Keegan et al., 2016; Kurkela et al., 2019; Kurkela et al., 2019), we have constructed a linearized response framework based on kinetic theory simulations, which propagates initial non-equilibrium energy-momentum tensor to the time, when the hydrodynamic constitutive equations are satisfied. Our publicly available package KøMPøST is a practical tool to do event-by-event simulations of heavy-ion collisions with realistic pre-equilibrium dynamics.

References

2019

Phys. Rev. C

Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions

Aleksi Kurkela, Aleksas Mazeliauskas, Jean-François Paquet, and 2 more authors

Phys. Rev. C, 2019

DOI arXiv Cite

@article{Kurkela:2018vqr,
  author = {Kurkela, Aleksi and Mazeliauskas, Aleksas and Paquet, Jean-Fran\c{c}ois and Schlichting, S\"oren and Teaney, Derek},
  title = {{Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions}},
  archiveprefix = {arXiv},
  primaryclass = {hep-ph},
  doi = {10.1103/PhysRevC.99.034910},
  journal = {Phys. Rev. C},
  volume = {99},
  number = {3},
  pages = {034910},
  year = {2019}
}

Phys. Rev. Lett.

Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory

Aleksi Kurkela, Aleksas Mazeliauskas, Jean-François Paquet, and 2 more authors

Phys. Rev. Lett., 2019

DOI arXiv Cite

@article{Kurkela:2018wud,
  author = {Kurkela, Aleksi and Mazeliauskas, Aleksas and Paquet, Jean-Fran\c{c}ois and Schlichting, S\"oren and Teaney, Derek},
  title = {{Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory}},
  archiveprefix = {arXiv},
  primaryclass = {hep-ph},
  doi = {10.1103/PhysRevLett.122.122302},
  journal = {Phys. Rev. Lett.},
  volume = {122},
  number = {12},
  pages = {122302},
  year = {2019}
}

2016

JHEP

Initial conditions for hydrodynamics from weakly coupled pre-equilibrium evolution

Liam Keegan, Aleksi Kurkela, Aleksas Mazeliauskas, and 1 more author

JHEP, 2016

DOI arXiv Cite

@article{Keegan:2016cpi,
  author = {Keegan, Liam and Kurkela, Aleksi and Mazeliauskas, Aleksas and Teaney, Derek},
  title = {{Initial conditions for hydrodynamics from weakly coupled pre-equilibrium evolution}},
  archiveprefix = {arXiv},
  primaryclass = {hep-ph},
  reportnumber = {CERN-TH-2016-117},
  doi = {10.1007/JHEP08(2016)171},
  journal = {JHEP},
  volume = {08},
  pages = {171},
  year = {2016}
}