Anisotropic hydrodynamics with a scalar collisional kernel

Journal Article · Fri Apr 20 00:00:00 EDT 2018 · Physical Review C

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

Almaalol, Dekrayat; Strickland, Michael

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, Journal Name: Physical Review C Vol. 97 Journal Issue: 4; ISSN 2469-9985
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English