Anisotropic hydrodynamics with a scalar collisional kernel

Journal Article · 20 April 2018 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.97.044911 · OSTI ID:1434185

Almaalol, Dekrayat ^[1]; Strickland, Michael ^[1]

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1. Kent State Univ., Kent, OH (United States). Dept. of Physics

Prior studies of nonequilibrium dynamics using anisotropic hydrodynamics have used the relativistic Anderson-Witting scattering kernel or some variant thereof. In this paper, we make the first study of the impact of using a more realistic scattering kernel. For this purpose, we consider a conformal system undergoing transversally homogenous and boost-invariant Bjorken expansion and take the collisional kernel to be given by the leading order $$2{\leftrightarrow}2$$ scattering kernel in scalar $${\lambda}{{\phi}}^{4}$$. We consider both classical and quantum statistics to assess the impact of Bose enhancement on the dynamics. We also determine the anisotropic nonequilibrium attractor of a system subject to this collisional kernel. We find that, when the near-equilibrium relaxation-times in the Anderson-Witting and scalar collisional kernels are matched, the scalar kernel results in a higher degree of momentum-space anisotropy during the system's evolution, given the same initial conditions. Additionally, we find that taking into account Bose enhancement further increases the dynamically generated momentum-space anisotropy.

• Research Organization: Kent State Univ., Kent, OH (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: SC0013470
• OSTI ID: 1434185
• Alternate ID(s): OSTI ID: 1503825
• Journal Information: Physical Review. C, Vol. 97, Issue 4; ISSN 2469-9985
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English