Stability of Gravastars with Exterior Regular Black Holes

Understand

This paper examines the stability of thin-shell gravastars in the context of regular spacetimes (Bardeen and Bardeen-de Sitter black holes).

• We apply cut and paste approach to construct gravastars through the matching of interior non-singular de Sitter geometry with exterior regular black hole.
• This model contains three regions, i.e., interior, thin-shell and exterior.
• The interior and exterior regions are connected at thin-shell.