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The emission from black hole binaries (BHBs) and active galactic nuclei(AGNs) displays significant aperiodic variabilities. The most promisingexplanation for these variabilities is the propagating fluctuations in theaccretion flow. It is natural to expect that the mechanism drivingvariabilities in BHBs and AGNs may operate in a black hole hyper-accretiondisk, which is believed to power gamma-ray bursts (GRBs). We study thevariabilities of jet power in GRBs based on the model of propagatingfluctuations. It is found that the variabilities of jet power and the temporalprofile of erratic spikes in this scenario are similar to those in observedlight curves of prompt gamma-ray emission of GRBs. Our results show that themechanism driving X-ray variabilities in BHBs and AGNs may operate in thecentral engine to drive the variabilities of GRBs.

Variabilities of Gamma-ray Bursts from Black Hole Hyper-accretion Disks