On the instability of some k-essence space-times

K. A. Bronnikov, J. C. Fabris, Denis C. Rodrigues

We study the stability properties of static, spherically symmetric configurations in k-essence theories with the Lagrangians of the form $F(X)$, $X\equiv {\varphi }_{,\alpha }{\varphi }^{,\alpha }$. The insta…