Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-GRECO
Subjects astro-ph
Date Monday 3 May 2021
Time 11:00
Institute IAP
Seminar Room Webinar for zoom details contact fumagall@iap.fr
Speaker's Last Name Gorghetto
Speaker's First Name Marco
Speaker's Email Address
Speaker's Institution Weizmann Institute
Title Gravitational Waves from Axions
Abstract Axions are among the best motivated candidates for new physics. If the Peccei-Quinn symmetry associated with an axion has been ever restored after inflation, axion strings form and inevitably produce a contribution to the stochastic gravitational wave background. In this talk I will discuss the resulting gravitational wave spectrum by combining effective field theory analysis with numerical simulations. I will show that a single ultralight axion-like particle with a decay constant larger than 10^{14} GeV and any mass between 10^{-18} and 10^{-28} eV leads to an observable gravitational wave spectrum, and still compatible with constraints from dark matter overproduction, isocurvature and dark radiation. Since the spectrum extends over a wide range of frequencies, the resulting signal could be detected by multiple experiments. I will also comment on the recent possible NANOgrav signal in light of these results.
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