Scalar field collapse with negative cosmological constant

Understand

The formation of black holes or naked singularities is studied in a model in which a homogeneous time-dependent scalar field with an exponential potential couples to four dimensional gravity with negative cosmological constant.

• An analytic solution is derived and its consequences are discussed.
• The model depends only on one free parameter, which determines the equation of state and decides the fate of the spacetime.
• Without fine tuning the value of this parameter the collapse ends in a generic formation of a black hole or a naked singularity.