球对称自引力坍缩体系的熵变

CHANGE OF ENTROPY OF A COLLAPSING SYSTEM WITH SPHERICAL SYMMETRY

本文在随动坐标下,证明了球对称孤立体系的理想流体.在自引力坍缩时,其熵保持不变.对于有辐射热流的开放系统,在自引力坍缩过程中出现熵减少.以一个有中微子逃逸的球对称引力坍缩体系为例,计算了其熵的减少过程.

In this paper. we show that the process of self-gravitational collapse is an isoentropy process for an isolated perfect fluid with spherical symmetry, and that the self-gravitational collapse with radiant heat flow is such a process in which the total entropy of the system decreases gradually. Taking a system of self-gravitational collapse of spherical symmetry with escaping neutrino, as an example, we calculate the entropy decreasing process.