Hitting the Books: How to uncover the true nature of the multiverse
by Laura Mersini-Houghton. Published by Mariner Books. Copyright © 2022 by Laura Mersini-Houghton. All rights reserved.
I already knew that the separation — the decoherence — of the branches of the wave function of the universe was triggered by their entanglement with the environmental bath of fluctuations. Now I wondered if we could calculate and find any traces of this early entanglement imprinted on our sky today.
Understanding how scars formed from entanglement is less complicated than you might imagine. I started by trying to create a mental picture of the entanglement’s scarring of our sky. I visualized all the surviving universes from the branches of the wave function of the universe, including ours, as a bunch of particles spread around the quantum multiverse.
I was concerned that these signatures, which have been stretched by inflation and the expansion of the universe, would be quite weak. But on the basis of unitarity, I believed that however weak they were, they were preserved somewhere in our sky in the form of local violations or deviations from uniformity and homogeneity predicted by cosmic inflation.
Rich, Tomo, and I decided that the best place to begin our search was in the CMB — cosmic microwave background, the afterglow from the Big Bang. CMB is the oldest light in the universe, a universal “ether” permeating the entire cosmos throughout its history. As such, it contains a sort of exclusive record of the first millisecond in the life of the universe. And this silent witness of creation is still all around us today, making it an invaluable cosmic lab.
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