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In this paper, we simulate the prompt emission light curves of gamma-raybursts (GRBs) within the framework of the Internal-Collision-induced MAgneticReconnection and Turbulence (ICMART) model. This model applies to GRBs with amoderately-high magnetization parameter $\sigma$ in the emission region. Weshow that this model can produce highly variable light curves with both fastand slow components. The rapid variability is caused by many locallyDoppler-boosted mini-emitters due to turbulent magnetic reconnection in amoderately-high-$\sigma$ flow. The run-away growth and subsequent depletion ofthese mini-emitters as a function time define a broad slow component for eachICMART event. A GRB light curve is usually composed of multiple ICMART eventsthat are fundamentally driven by the erratic GRB central engine activity.Allowing variations of the model parameters, one is able to reproduce a varietyof light curves and the power density spectra as observed.

Gamma-Ray Burst Prompt Emission Light Curves and Power Density Spectra in the ICMART Model