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7 papers · 2 filters
Exact Coleman-de Luccia Instantons
Sugumi Kanno, Jiro Soda
We present exact Coleman-de Luccia (CdL) instantons, which describe vacuum decay from Anti de Sitter (AdS) space, de Sitter (dS) space and Minkowski space to AdS space. We systemat…
Collapse of simple harmonic universe
Audrey T. Mithani, Alexander Vilenkin
In a recent paper Graham et al constructed oscillating and static universe models which are stable with respect to all classical perturbations. Here we show that such universes are…
Minkowski vacua can be metastable
Jaume Garriga, Benjamin Shlaer, Alexander Vilenkin
We investigate the recent suggestion that a Minkowski vacuum is either absolutely stable, or it has a divergent decay rate and thus fails to have a locally Minkowski description. T…
The Principle of Mediocrity
Alexander Vilenkin
Recent developments in cosmology suggest that much of the universe is in a state of explosive, accelerated expansion, called inflation. We live in a "bubble" where inflation has en…
Phenomenology of the CAH+ measure
Michael P. Salem, Alexander Vilenkin
The CAH+ measure regulates the infinite spacetime volume of the multiverse by constructing a surface of constant comoving apparent horizon (CAH) and then removing the future lightc…
Holographic Dual of de Sitter Universe with AdS Bubbles
Sugumi Kanno, Misao Sasaki, Jiro Soda
We study the proposal that a de Sitter (dS) universe with an Anti-de Sitter (AdS) bubble can be replaced by a dS universe with a boundary CFT. To explore this duality, we consider…