Fingerprints of Primordial Universe Paradigms as Features in Density Perturbations

TL;DR

This paper proposes that tiny oscillations of massive fields in primordial universe models create features in density perturbations, which can serve as direct evidence to distinguish different early universe paradigms.

Contribution

It introduces a generic signal mechanism from massive field oscillations that encode the universe's scale factor evolution, aiding paradigm differentiation.

Findings

Features in density perturbations reflect the universe's scale factor.

Signals can distinguish different primordial universe models.

Method provides a direct observational probe for early universe paradigms.

Abstract

Experimentally distinguishing different primordial universe paradigms that lead to the Big Bang model is an outstanding challenge in modern cosmology and astrophysics. We show that a generic type of signals that exist in primordial universe models can be used for such purpose. These signals are induced by tiny oscillations of massive fields and manifest as features in primordial density perturbations. They are capable of recording the time-dependence of the scale factor of the primordial universe, and therefore provide direct evidence for specific paradigm.