The properties of the QCD axion are strictly related to the dependence of strong interactions on the topological parameter theta. We present a determination of the topological properties of QCD for temperatures up to around 600 MeV, obtained by lattice QCD simulations with 2+1 flavors and physical quark masses. Numerical results for the topological susceptibility, when compared to instanton gas computations, differ both in size and in the temperature dependence. We discuss the implications of such findings for axion phenomenology, also in comparison to similar studies in the literature, and the prospects for future investigations.
Recent progress on QCD inputs for axion phenomenology / Bonati, C.; D'Elia, M.; Mariti, M.; Martinelli, G.; Mesiti, M.; Negro, F.; Sanfilippo, F.; Villadoro, G.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - 137:(2017), p. 08004. (Intervento presentato al convegno 12Ith Quark Confinement and the Hadron Spectrum tenutosi a Makedonia Palace Conference Centre, grc) [10.1051/epjconf/201713708004].
Recent progress on QCD inputs for axion phenomenology
Martinelli G.;
2017
Abstract
The properties of the QCD axion are strictly related to the dependence of strong interactions on the topological parameter theta. We present a determination of the topological properties of QCD for temperatures up to around 600 MeV, obtained by lattice QCD simulations with 2+1 flavors and physical quark masses. Numerical results for the topological susceptibility, when compared to instanton gas computations, differ both in size and in the temperature dependence. We discuss the implications of such findings for axion phenomenology, also in comparison to similar studies in the literature, and the prospects for future investigations.| File | Dimensione | Formato | |
|---|---|---|---|
|
Bonati_Recent_2017.pdf
accesso aperto
Tipologia:
Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza:
Creative commons
Dimensione
975.87 kB
Formato
Adobe PDF
|
975.87 kB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
