Speaker
Zack Wolff
(Purdue University)
Description
Comparing hydrodynamic simulations to heavy ion data inevitably requires
the conversion of the fluid to particles. This conversion, typically done
in the Cooper-Frye formalism, is ambiguous for viscous fluids. We compute
self-consistent phase space corrections by solving the linearized Boltzmann
equation and contrast the solutions to those obtained using the ad-hoc
``democratic Grad'' ansatz typically employed in the literature where
coefficients are independent of particle dynamics. Solutions are calculated
analytically for a massless gas and numerically for both a pion-nucleon gas
and for the general case of a hadron resonance gas. We find that the
momentum dependence of the corrections in all systems investigated is best
fit by a power close to $\frac{3}{2}$ rather than the typically used quadratic
ansatz. The effects on flow coefficients are also calculated and found to be substantial for elliptic flow, thus the form of these corrections should be taken
into account when extracting medium properties from experimental data.
| On behalf of collaboration: | None |
|---|
Author
Zack Wolff
(Purdue University)
Co-author
Denes Molnar
(Purdue University)
