# dS$\boldsymbol{_2}$ as excitation of AdS$\boldsymbol{_2}$

### Submission summary

 As Contributors: Daniel Grumiller · Robert McNees Arxiv Link: https://arxiv.org/abs/2204.00045v1 (pdf) Date submitted: 2022-04-29 21:00 Submitted by: McNees, Robert Submitted to: SciPost Physics Academic field: Physics Specialties: Gravitation, Cosmology and Astroparticle Physics High-Energy Physics - Theory Approach: Theoretical

### Abstract

We introduce a family of 2D dilaton gravity models with state-dependent constant curvature so that dS$_2$ emerges as an excitation of AdS$_2$. Curiously, the strong coupling region corresponds to the asymptotic region geometrically. Apart from these key differences, many features resemble the Almheiri--Polchinski model. We discuss perturbative and non-perturbative thermodynamical stability, bubble nucleation through matter shockwaves, and semiclassical backreaction effects. In some of these models, we find that low temperatures are dominated by AdS$_2$ but high temperatures are dominated by dS$_2$, concurrent with a recent proposal by Susskind.

###### Current status:
Editor-in-charge assigned