  In this paper, we study the blowup phenomena for the regular solutions of the
isentropic relativistic Euler-Poisson equations with a vacuum state in
spherical symmetry. Using a general family of testing functions, we obtain new
blowup conditions for the relativistic Euler-Poisson equations. We also show
that the proposed blowup conditions are valid regardless of the speed
requirement, which was one of the key constraints stated in "Y. Geng,
Singularity Formation for Relativistic Euler and Euler-Poisson Equations with
Repulsive Force, Commun. Pure Appl. Anal., 14 (2015), 549--564.".
