Quantum Mechanics, Gravity, and the Multiverse

TL;DR

This paper explores how quantum mechanics, string theory, and eternal inflation support the multiverse concept, leading to a unified understanding of spacetime, gravity, and the many worlds interpretation, and addressing the measure problem.

Contribution

It presents a novel framework unifying the multiverse with quantum mechanics and offers insights into the measure problem in eternal inflation.

Findings

Supports multiverse hypothesis through observational and theoretical evidence

Unifies multiverse with many worlds interpretation of quantum mechanics

Provides a potential solution to the measure problem in eternal inflation

Abstract

The discovery of accelerating expansion of the universe has led us to take the dramatic view that our universe may be one of the many universes in which low energy physical laws take different forms: the multiverse. I explain why/how this view is supported both observationally and theoretically, especially by string theory and eternal inflation. I then describe how quantum mechanics plays a crucial role in understanding the multiverse, even at the largest distance scales. The resulting picture leads to a revolutionary change of our view of spacetime and gravity, and completely unifies the paradigm of the eternally inflating multiverse with the many worlds interpretation of quantum mechanics. The picture also provides a solution to a long-standing problem in eternal inflation, called the measure problem, which I briefly describe.