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Topology and Axions in QCD

Speaker: 
Maria Paola Lombardo | INFN Firenze
Start date: 
Wednesday, 1 July, 2020 - 11:00
Location: 
Webinar | Gmeet
Abstract: 
QCD topology holds the key to the understanding of many aspects of strong interactions, and opens a window to dark matter. The same topological fluctuations which account for the mass of the eta' meson give also mass to a yet unobserved, but intensively searched for, new particle, the QCD axion. We present here the current status of topological studies on the lattice, and their implication on axion physics. We outline the specific challenges posed by lattice topology, the different proposals for handling them, the observable effects of topology on the QCD spectrum and its interrelation with chiral and axial symmetries. We review the transition to the Quark Gluon Plasma, the open issues, the fate of topology at the transition, and the approach to the high temperature limit. We discuss the extrapolations needed to reach the regime of cosmological relevance, and the resulting constraints on the QCD axion. ***************************************************************************************************************************** Short Bio | Maria Paola Lombardo is a senior INFN researcher. Her research focusses on the physics of strong interactions, in particular the phases and phase transitions in QCD. She mostly uses the lattice approach and numerical simulations, and enjoys contrasting and comparing the lattice results with those of other approaches, as well as exploring applications of lattice studies to nearby fields. ************************************************************************************************************************************************************************ “Pursuant to art. 13 of EU Regulation No. 2016/679 – General Data Protection Regulation and as detailed in the Privacy Policy for FBK event’s participants, we inform you that the event will be recorded and disclosed on the FBK institutional channels. In order not to be filmed or recorded, you can disable the webcam and/or mute the microphone.“