A Non-Inflationary Axion and ALP Misalignment Mechanism
Robert Brandenberger (McGill University)
TL;DR
This paper proposes a new non-inflationary mechanism for generating axion and ALP fields through Planck-suppressed symmetry-breaking terms, addressing issues related to quantum gravity constraints on global symmetries.
Contribution
It introduces a novel misalignment mechanism driven by Planck-scale effects, offering an alternative to inflation-based models for axion and ALP field generation.
Findings
Planck-suppressed terms can induce axion and ALP oscillations at low temperatures.
The mechanism provides a coherent field generation without relying on inflation.
Addresses quantum gravity constraints on global symmetries.
Abstract
Based on considerations of quantum gravity, global symmetries which lead to axions as pseudo Nambu-Goldstone bosons after low scale symmetry breaking cannot be exact at the Planck scale. Here, we show that Planck-suppressed terms which yield this symmetry breaking may provide a non-inflationary misalignment mechanism which can generate coherent oscillations of the axion and axion-like particle (ALP) fields at low temperatures.
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Taxonomy
TopicsCosmology and Gravitation Theories · Dark Matter and Cosmic Phenomena · Noncommutative and Quantum Gravity Theories