Understand
In this work, we present the possible existence of thermal phase transition between AdS to dS asymptotic geometries in vacuum in the context of novel 4D Einstein-Gauss-Bonnet (EGB) gravity.
- The phase transition proceeds through the thermalon (the Euclidean sector of the bubble thin-shell) formation having a black hole inside the interior of dS spacetime and a thermal AdS spacetime in the exterior without introducing any matter field.
- According to our analysis, we find that the gravitational phase transitions using novel 4D EGB gravity always take place for all existences of the 4D EGB coupling.
- In contrast to 5-dimensional EGB gravity, the existence of phase transition requires a narrow range of the 4D EGB coupling with particular critical values, while the 5-dimension sector has a wider range of its coupling for the existences of the thermalon and there also exist critical values for the emergence of the phase transition.