Radiative gravastar with thermal spectrum: Sudden vacuum condensation without gravitational collapse

The gravastar is an exotic compact object proposed as a final product of the gravitational collapse massive in order to resolve problems associated with black holes. It enclosed by thin crust and inside it occupied positive cosmological constant. Recently, present authors studied quantum particle creation through spherically symmetric form gravastar, showed that newly formed emits thermal radiation Gibbons-Hawking temperature its de Sitter core. In this paper, understand more about formation, we investigate another toy model formation; star hollow suddenly becomes vacuum condensation. We find emitted from just also model. comes change geometry accompanied condensate.