Many worlds in one

Abstract

A generic prediction of inflation is that the thermalized region we inhabit is spatially infinite. Thus, it contains an infinite number of regions of the same size as our observable universe, which we shall denote as $Ø$-regions. We argue that the number of possible histories which may take place inside of an $Ø$-region, from the time of recombination up to the present time, is finite. Hence, there are an infinite number of $Ø$-regions with identical histories up to the present, but which need not be identical in the future. Moreover, all histories which are not forbidden by conservation laws will occur in a finite fraction of all $Ø$-regions. The ensemble of $Ø$-regions is reminiscent of the ensemble of universes in the many-world picture of quantum mechanics. An important difference, however, is that other $Ø$-regions are unquestionably real.

9 pages, 2 figures, comments and references added

References in corpus (3)

• Inflation and Eternal Inflation
• Positive vacuum energy and the N-bound
• Holographic Bound From Second Law of Thermodynamics

Cited by in corpus (19)

• The Mathematical Universe
• What does inflation really predict?
• Shortcomings in the Understanding of Why Cosmological Perturbations Look Classical
• Multiverses and physical cosmology
• How many universes are in the multiverse?
• Prediction and explanation in the multiverse
• The Beginning and the End: The Meaning of Life in a Cosmological Perspective
• Born in an Infinite Universe: a Cosmological Interpretation of Quantum Mechanics
• The No-Boundary Measure in the Regime of Eternal Inflation
• Quantum origin of the primordial fluctuation spectrum and its statistics
• Watchers of the multiverse
• Suppressing Quantum Fluctuations in Classicalization
• Galaxy Formation Efficiency and the Multiverse Explanation of the Cosmological Constant with EAGLE Simulations
• Inhomogeneities from quantum collapse scheme without inflation
• Phenomenological signatures of gauge invariant theories of gravity with vectorial nonmetricity
• Is the Quilted Multiverse Consistent with a Thermodynamic Arrow of Time?
• The Day the Universes Interacted: Quantum Cosmology without a Wave function
• Is there paradox with infinite space?
• Empirical constraints on vacuum decay in the stringy landscape