Hydrodynamic model of heavy-ion collisions with low momentum components

TL;DR

This paper develops a hydrodynamic model for heavy-ion collisions focusing on low momentum particles, revealing how high momentum cutoffs influence temperature evolution and photon flow.

Contribution

The study introduces a hydrodynamic model with a cutoff for high momentum components, exploring its effects on collision phenomenology.

Findings

Higher initial quark matter temperature due to modified equation of state

Direct photon elliptic flow sensitivity to thermalization momentum dependence

Implications for interpreting particle spectra in heavy-ion collisions

Abstract

Relativistic heavy-ion collisions suggest that low momentum regions of the observed particle spectra are thermal and hydrodynamic, while medium-high momentum regions are non-thermal and perturbative. In this study, I construct a hydrodynamic model of heavy-ion collisions by cutting off the medium-high momentum contributions and investigate the phenomenological consequences. Numerical simulations indicate that the temperature of the quark matter can be higher at earlier times owing to the modification of the equation of state. It is also suggested that direct photon elliptic flow can be sensitive to the momentum dependence of thermalization.