751 citations · 2.5k across the 29 of their papers we have counts for
30 papers
Imperfect axions with no domain wall problem
Marco Gorghetto, Edward Hardy, Gilad Perez +1
Post-inflationary axion theories with domain wall number suffer from a domain wall problem. We show analytically, and confirm via simulations, that there is a region of pheno…
Post-inflationary axions: a minimal target for axion haloscopes
Marco Gorghetto, Edward Hardy
An axion-like-particle (ALP) in the post-inflationary scenario with domain wall number can be dark matter if the residual symmetry has a small explicit breakin…
Dark Photon Stars: Formation and Role as Dark Matter Substructure
Marco Gorghetto, Edward Hardy, John March-Russell +2
Any new vector boson with non-zero mass (a `dark photon' or `Proca boson') that is present during inflation is automatically produced at this time from vacuum fluctuations and can…
Axion Quasiparticles for Axion Dark Matter Detection
Jan Schütte-Engel, David J. E. Marsh, Alexander J. Millar +7
It has been suggested that certain antiferromagnetic topological insulators contain axion quasiparticles (AQs), and that such materials could be used to detect axion dark matter (D…
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…
More Axions from Strings
Marco Gorghetto, Edward Hardy, Giovanni Villadoro
We study the contribution to the QCD axion dark matter abundance that is produced by string defects during the so-called scaling regime. Clear evidence of scaling violations is fou…