Gravitational Collapse of a Spherical Star with Heat Flow as a Possible Energy Mechanism of Gamma-Ray Bursts

摘要

We investigate the gravitational collapse of a spherically symmetric,inhomogeneous star,which is describedby a perfect fluid with heat flow and satisfies the equation of state p=ρ/3 at its center.In the process of the gravitationalcollapse,the energy of the whole star is emitted into space.And the remaining spacetime is a Minkowski one without aremnant at the end of the process.For a star with a solar mass and solar radius,the total energy emitted is at the orderof 10^(54) erg,and the time-scale of the process is about 8 s.These are in the typical values for a gamma-ray burst.Thus,we suggest the gravitational collapse of a spherical star with heat flow as a possible energy mechanism of gamma-raybursts.