261 citations · 861 across the 14 of their papers we have counts for
16 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…
The COSMIC WISPers White Paper: The physics case for Weakly Interacting Slim Particles
Ariel Arza, Deniz Aybas, Shyam Balaji +124
Axions and other very weakly interacting slim particles (WISPs), with masses below 1 GeV, arise naturally in many extensions of the Standard Model of particle physics. In particula…
Large-Scale Structure Probes of the Post-Inflationary Axiverse
Marco Gorghetto, Sokratis Trifinopoulos, Georgios Valogiannis
We study the cosmology of axions in the post-inflationary scenario, where random initial conditions and the ensuing string-domain-wall network generate an isocurvature power spectr…
Standard Model Baryon Number Violation at Zero Temperature from Higgs Bubble Collisions
Nabeen Bhusal, Simone Blasi, Martina Cataldi +3
We compute for the first time baryon number violation at zero temperature from Higgs bubble collisions and find that it can be of the same order as that from thermal sphalerons in…
Bracketing the soliton-halo relation of ultralight dark matter
Kfir Blum, Marco Gorghetto, Edward Hardy +1
In theories of ultralight dark matter, solitons form in the inner regions of galactic halos. The observational implications of these depend on the soliton mass. Various relations b…
Exploring the Dark Universe: A European Strategy for Axions and other WISPs Discovery
Deniz Aybas, Francesca Calore, Michele Cicoli +17
Axions and other very weakly interacting slim (with 1 GeV) particles (WISPs) are a common feature of several extensions of the Standard Model of Particle Physics. The search…
More Axion Stars from Strings
Marco Gorghetto, Edward Hardy, Giovanni Villadoro
We show that if dark matter consists of QCD axions in the post-inflationary scenario more than ten percent of it efficiently collapses into Bose stars at matter-radiation equality.…
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…
A Generic Formation Mechanism of Ultralight Dark Matter Solar Halos
Dmitry Budker, Joshua Eby, Marco Gorghetto +2
As-yet undiscovered light bosons may constitute all or part of the dark matter (DM) of our Universe, and are expected to have (weak) self-interactions. We show that the quartic sel…
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…
Probing CP Violation in Photon Self-Interactions with Cavities
Marco Gorghetto, Gilad Perez, Inbar Savoray +1
In this paper we study CP violation in photon self-interactions at low energy. These interactions, mediated by the effective operator , where () is the…
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…
Topological Susceptibility and QCD Axion Mass: QED and NNLO corrections
Marco Gorghetto, Giovanni Villadoro
We improve the precision of the topological susceptibility of QCD, and therefore of the QCD axion mass, by including and NNLO corrections in the chiral expansion, w…
Axions from Strings: the Attractive Solution
Marco Gorghetto, Edward Hardy, Giovanni Villadoro
We study the system of axion strings that forms in the early Universe if the Peccei-Quinn symmetry is restored after inflation. Using numerical simulations, we establish the existe…