Anomalies and parities for quintessential and ultra-light axions
Jihn E. Kim
TL;DR
This paper examines the energy scales at which explicit symmetry breaking occurs for quintessential and ultra-light axions, focusing on the scale needed for the quintessential axion to be consistent with cosmological observations.
Contribution
It provides an analysis of the symmetry breaking scales for QA and ULA, highlighting the specific energy scale (~10^8 GeV) relevant for the quintessential axion.
Findings
The energy scale for QA is approximately 10^8 GeV.
Explicit breaking terms are crucial for the properties of axions.
The paper clarifies the relationship between symmetry breaking scales and axion phenomenology.
Abstract
We discuss the energy scales of the explicit breaking terms of the global symmetries \USW~ needed for the quinessential axion (QA) and the ultra-light axion (ULA). The appropriate scale of QA is about GeV.
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