Colla@se of higher-entropy stellar core and long gamma-ray bursts

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The central engine of long-duration gamma-ray bursts has not been clarified yet. A system composed of a black hole and an accretion torus is promising candidate of their engine. Based on the latest observations and theoretical evolution models of massive stellar cores, I developed a hypothesis that the progenitor star of gamma-ray bursts should have higher entropy than ordinary supernova. By performing numerical relativity simulations, I studied the collapse of the higher entropy cores and clarified the dynamics of the black hole formation. Based on the simulation results, I showed that the properties of long-duration gamma-ray busts can be explained if the progenitor core has higher entropy as I assumed in the hypothisis.