The Multiverse in an Inverted Island
arXiv:2106.05271 · doi:10.1103/PhysRevD.104.086007
Abstract
We study the redundancies in the global spacetime description of the eternally inflating multiverse using the quantum extremal surface prescription. We argue that a sufficiently large spatial region in a bubble universe has an entanglement island surrounding it. Consequently, the semiclassical physics of the multiverse, which is all we need to make cosmological predictions, can be fully described by the fundamental degrees of freedom associated with certain finite spatial regions. The island arises due to mandatory collisions with collapsing bubbles, whose big crunch singularities indicate redundancies of the global spacetime description. The emergence of the island and the resulting reduction of independent degrees of freedom provides a regularization of infinities which caused the cosmological measure problem.
11 pages, 7 figures; minor revisions
References in corpus (10)
- A Primer for Black Hole Quantum Physics
- Relative entropy and the Bekenstein bound
- Entanglement entropy in holographic moving mirror and Page curve
- A Holographic Framework for Eternal Inflation
- How big is a black hole?
- A measure of the multiverse
- Hawking-Moss bounces and vacuum decay rates
- Coarse-Graining Holographic States: A Semiclassical Flow in General Spacetimes
- Overcounting of interior excitations: A resolution to the bags of gold paradox in AdS
- From the Black Hole Conundrum to the Structure of Quantum Gravity