4 papers · 1 filter
Axion Perturbations: A General Analytical Treatment
Itamar J. Allali, Priyesh Chakraborty, JiJi Fan +1
Cosmological data provides us two key constraints on dark matter (DM): it must have a particular abundance, and it must have an adiabatic spectrum of density perturbations in the e…
A Step in Flux to Suppress Axion Isocurvature
Priyesh Chakraborty, Junyi Cheng, Matthew Reece +1
The QCD axion in the pre-inflation scenario faces a stringent isocurvature constraint, which requires a relatively low Hubble scale during inflation. If the axion was heavier than…
Extra-Dimensional Axion Expectations
Matthew Reece
Axions arising as modes of higher-dimensional gauge fields are known to offer a compelling solution to the axion quality problem and to naturally arise in string theory. In this co…
The Quality/Cosmology Tension for a Post-Inflation QCD Axion
Qianshu Lu, Matthew Reece, Zhiquan Sun
It is difficult to construct a post-inflation QCD axion model that solves the axion quality problem (and hence the Strong CP problem) without introducing a cosmological disaster. I…