https://doi.org/10.1140/epjc/s10052-018-6112-6
Regular Article - Theoretical Physics
Azimuthal anisotropies at high momentum from purely non-hydrodynamic transport
1
Department of Physics, University of Colorado, Boulder, CO, 80309, USA
2
Center for Theory of Quantum Matter, University of Colorado, Boulder, CO, 80309, USA
* e-mail: paul.romatschke@colorado.edu
Received:
5
March
2018
Accepted:
27
July
2018
Published online:
10
August
2018
In the limit of short mean free path, relativistic kinetic theory gives rise to hydrodynamics through a systematically improvable gradient expansion. In the present work, a systematically improvable expansion in the opposite limit of large mean free path is considered, describing the dynamics of particles which are almost, but not quite, non-interacting. This non-hydrodynamic “eremitic” expansion does not break down for large gradients, and may be useful in situations where a hydrodynamic treatment is not applicable. As applications, azimuthal anisotropies at high transverse momenta in Pb + Pb and p + Pb collisions at 
TeV are calculated from the first order eremitic expansion of kinetic theory in the relaxation time approximation.
© The Author(s), 2018
