Comment on “Time-dependent solution for a star immersed in a background radiation” [H. Liu and Q. Zhang, J. Math. Phys. 43, 4904 (2002)].

In a recent paper [J. Math. Phys. 43, 4904 (2002)] Liu and Zhang present a time-dependent solution for a star which is immersed in a background radiation. This solution was obtained by analyzing equations arising from the analysis of a five-dimensional solution that contained their solution. We show that, while their analysis and conclusions are valid, their equations are unnecessarily restrictive when applied to the four-dimensional case. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]