Friedmann-Robertson-Walker宇宙中Hayward 捕获视界的一些性质

摘要

Hayward利用类光测地线汇的收缩或膨胀发现了时空的捕获视界(Trapping Horizon),满足一定条件的捕获视界后来被认为可以作为黑洞的边界,并且建立了黑洞热力学,近年来这种黑洞热力学被应用到Friedmann-Robertson-Walker宇宙(以下简称FRW宇宙)中并取得了很多研究成果,但大多数此类文献都只着重关注这种黑洞热力学在FRW宇宙中怎样被应用,而对FRW宇宙中捕获视界本身的性质的关注却很少.所以本研究主要关注FRW宇宙中捕获视界的一些性质,这个问题的答案可以对捕获视界上的热力学在FRW宇宙中的更好应用起到一点作用.%Hayward found the trapping horizon in space-time with the properties of whether the null geodesies flux expansion or contraction as a tool. Subsequently it was found that the trapping horizon under some condition could be regard as the black hole horizon and the thermodynamics on this trapping horizon was also available. Recently the thermodynamics on this trapping horizon was considered in the Friedmann-Robertson-Walker ( FRW) universe background and huge achievements have been reached. However,most such papers pay major attention to how the thermodynamics on this trapping horizon could be connected to the FRW universe reseach rather than to properties of trapping horizon in FRW universe. So this paper will focus on the properties of trapping horizon in FRW universe, and it is regard that the answer to this question would make some contribution to the further research on the thermodynamics in the FRW universe.