Theoretical Physics Colloquium: Edward Hardy

24 Nov 2023
Seminars and colloquia
Lindemann Lecture Theatre
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Edward Hardy (Oxford)

Seminar series
Theoretical physics colloquia
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The QCD axion: from cosmic strings to dark matter substructure

Abstract: The QCD axion is among the best-motivated candidates for physics beyond the Standard Model, and it can also lead to a range of interesting cosmological and astrophysical effects if it comprises Dark Matter. I will discuss the so-called post-inflationary scenario, in which cosmic axion strings form at early times. In this case, the dark matter axions are produced with a non-trivial spatial distribution that leads to relatively dense substructure in the late Universe. I will argue that this substructure has several interesting, previously unconsidered, features, which might have observational or experimental implications.