Inflation and the Measurement Problem

TL;DR

This paper introduces a novel model for the quantum measurement problem in inflationary cosmology, using Bose gas analogies and self-interaction Hamiltonians to produce the observed power spectrum and Gaussianity.

Contribution

It presents a new approach that models cosmological perturbations as a Bose gas, providing a mechanism for quantum measurement and classicalization during inflation.

Findings

Reproduces the standard adiabatic, scale-invariant power spectrum.

Achieves Gaussian random fields consistent with observations.

Offers a new perspective on quantum measurement in cosmology.

Abstract

We propose a solution to the quantum measurement problem in Inflation. Our model treats Fourier modes of cosmological perturbations as analogous to particles in a weakly-interacting Bose gas. We generalize the idea of a macroscopic wavefunction to cosmological fields, and construct a self-interaction Hamiltonian that focuses that wavefunction. By appropriately setting the coupling between modes, we obtain the standard adiabatic, scale-invariant power spectrum. Because of Central Limit Theorem (CLT), we recover a Gaussian Random Field, consistent with observations.