Dark energy stars with a phantom field

Dark energy is the constituent with an enormous abundance in present Universe, responsible for Universe's accelerated expansion. Therefore, it plausible that dark may interact within any compact astrophysical object. The author [S. S. Yazadjiev, Phys. Rev. D 83, 127501 (2011)] constructs exact star solution consisting of ordinary matter and a phantom field from constant density (CDS) known as Schwarzschild interior solution. denotes (DES). claims represents star. So far, role DES not systematically studied yet. Related to this issue, we analyze condition DES. We expect DESs shall violate strong (SEC) particular condition. discover SEC fully violated only when compactness reaches Buchdahl limit. Furthermore, also investigate causal conditions stabilities due convective motion gravitational cracking. find those are violated. These results indicate physically stable. However, consider ultracompact object which can calculate wave echo time frequency compare them CDS. contribution delays echoes. effective potential perturbed studied. enjoys well like CDS but deeper well. possibility could form gravastar $C=1$. It found produced possesses no singularity dS-like phase interior. open more opportunities observational study near future, mostly objects.