2 papers
hep-ph2023
Early vs late string networks from a minimal QCD Axion
Marco Gorghetto, Edward Hardy, Horia Nicolaescu +2
We propose a new regime of minimal QCD axion dark matter that lies between the pre- and post-inflationary scenarios, such that the Peccei-Quinn (PQ) symmetry is restored only on su…
hep-ph2021
Observing Invisible Axions with Gravitational Waves
Marco Gorghetto, Edward Hardy, Horia Nicolaescu
If the Peccei-Quinn symmetry associated to an axion has ever been restored after inflation, axion strings inevitably produce a contribution to the stochastic gravitational wave bac…