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Non-equilibrium attractor in high-temperature QCD plasmas
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We establish the existence of a far-from-equilibrium attractor in weakly-coupled gauge theory undergoing one-dimensional Bjorken expansion. We demonstrate that the resulting far-from-equilibrium evolution is insensitive to certain features of the initial condition, including both the initial momentum-space anisotropy and initial occupancy. We find that this insensitivity extends beyond the energy-momentum tensor to the detailed form of the one-particle distribution function. Based on our results, we assess different procedures for reconstructing the full one-particle distribution function from the energy-momentum tensor along the attractor and discuss implications for the freeze-out procedure used in the phenomenological analysis of ultra-relativistic nuclear collisions.
Forward citations
Cited by 4 Pith papers
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Onset of Bjorken Flow in Quantum Evolution of the Massive Schwinger Model
In the 1+1D massive Schwinger model, tensor network simulation of a localized excitation reveals Bjorken-like hydrodynamic flow for small fermion mass, but not for large mass.
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Attractor of hydrodynamic attractors
Second- and higher-order hydrodynamic attractors converge to the same universal curve before the Navier-Stokes limit, with the leading correction controlled only by second-order coefficients.
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Quantum thermalization of Quark-Gluon Plasma
In a 1+1D Schwinger model, strong-coupling quark Wigner functions thermalize to quantum statistical averages, while weak-coupling scalar and axial components do not because of many-body scars, and the θ-vacuum angle c...
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Constraint on initial conditions of one-dimensional expanding fluids from nonlinear causality
Nonlinear causality constrains one-dimensional Bjorken-expanding viscous fluids to small inverse Reynolds numbers, giving minimum initial times of about 0.5 to 1 fm and maximum initial energy densities of about 5 to 3...
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