TL;DR
Island cosmology proposes that quantum fluctuations in de Sitter space can create matter islands resembling our universe, with a scale-invariant density fluctuation spectrum, which eventually re-enters the cosmological constant sea.
Contribution
This paper introduces a model where quantum fluctuations in de Sitter spacetime generate matter islands, offering a novel explanation for the universe's structure within a cosmological constant framework.
Findings
Density fluctuations are scale-invariant with appropriate amplitude.
Matter islands can grow large enough to resemble our observable universe.
The universe's matter region re-enters the cosmological constant sea over time.
Abstract
If the observed dark energy is a cosmological constant, the canonical state of the universe is de Sitter spacetime. In such a spacetime, quantum fluctuations that violate the null energy condition will create islands of matter that, if large enough, may resemble our observable universe. Phenomenological approaches to calculating density fluctuations yield a scale invariant spectrum with suitable amplitude. With time, the island of matter that is our observable universe, re-enters the cosmological constant sea.
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Taxonomy
TopicsHistorical and Architectural Studies · Pacific and Southeast Asian Studies · Island Studies and Pacific Affairs