On AdS to dS transitions in higher-curvature gravity

Understand

We study the possible existence of gravitational phase transitions from AdS to dS geometries in the context of higher-curvature gravities.

• We use Lanczos-Gauss-Bonnet (LGB) theory with a positive cosmological constant as a toy model.
• This theory has two maximally symmetric vacua with positive (dS) and negative (AdS) constant curvature.
• We show that a phase transition from the AdS vacuum to a dS black hole geometry takes place when the temperature reaches a critical value.