The properties of the QCD axion can be studied from the dependence of strong interactions on theθ-parameter. We present a study of the moments of the topological charge for temperatures up to around 600 MeV, obtained by lattice QCD simulations with 2+1 flavors at the physical quark masses. Our numerical results for the topological susceptibility, when compared to the instanton gas calculation, differ both in size and in the temperature dependence. We discuss the implications of these results for axion phenomenology, a comparison with other more recent studies and the prospects for future investigations.
Axion phenomenology and lattice QCD / Martinelli, Guido; Bonati, Claudio; D'Elia, Massimo; Mariti, Marco; Mesiti, Michele; Negro, Francesco; Sanfilippo, Francesco; Villadoro, Giovanni. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 256:PoS(2016), p. 088. (Intervento presentato al convegno Lattice 2016 tenutosi a Southampton Univ. Southampton England) [10.22323/1.256.0088].
Axion phenomenology and lattice QCD
Martinelli, Guido;
2016
Abstract
The properties of the QCD axion can be studied from the dependence of strong interactions on theθ-parameter. We present a study of the moments of the topological charge for temperatures up to around 600 MeV, obtained by lattice QCD simulations with 2+1 flavors at the physical quark masses. Our numerical results for the topological susceptibility, when compared to the instanton gas calculation, differ both in size and in the temperature dependence. We discuss the implications of these results for axion phenomenology, a comparison with other more recent studies and the prospects for future investigations.| File | Dimensione | Formato | |
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