### Speaker

Mr
Li Yan
(Stony Brook University)

### Description

The particle spectrum from RHIC and LHC can be decomposed into harmonic series that defines the dipolar flow $v_1$, the elliptic flow $v_2$, the triangular flow $v_3$, and $v_4$, and $v_5$ etc. To understand the origin of higher order harmonics, we extend the linear response formalism for anisotropic flow to include the non-linear response which results from the interactions between the lowest harmonics and the elliptic flow. For example, $v_{5(23)}/(\epsilon_2
\epsilon_3)$ records the $v_5$ generated by the non-linear interactions between $v_2$ and $v_3$. Ideal and viscous hydrodynamic calculations show that the non-linear response becomes dominant for n=4 and n=5 in non-central collisions. This trend is much more pronounced for viscous hydrodynamics where the linear response for n=4 and n=5 is negligible.

### Primary author

Prof.
Derek Teaney
(Stony Brook University)

### Co-author

Mr
Li Yan
(Stony Brook University)

## Peer reviewing

### Paper

Paper files: