BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Mohamed Anber\, Lewis & Clark College\n\n
The general lore\, according to effective field theory\, is that one ignores the high energy degrees of f reedom when studying low energy phenomena. For example\, we usually do not need to know quantum chromodynamics (QCD) (the strong nuclear force) in o rder to study fluid mechanics! However\, the existence of '\;t Hooft an omalies (subtle phases in the partition function) may signal non-trivial i ntertwining between the high and low energy scales. This assertion can be seen in axion physics\; axion is a hypothetical particle that may play imp ortant roles in solving a few puzzles in the Universe. \; After a brie f introduction to QCD and axions\, I show how this intertwining takes plac e on axion domain walls (DW). To this end\, I first discuss a new class of '\;t Hooft anomalies that was recently identified\, and then use the a nomalies to argue that quarks are deconfined (liberated) on axion DW. This newly discovered phenomenon implies that non-trivial interplay between di fferent scales happens on the walls. Further\, I confirm this picture by p erforming explicit calculations in a toy model\, which is argued to be con tinuously connected to the full-fledged QCD.
\n DTSTART:20200219T203000Z LOCATION:Physics Building\, Room 204 SUMMARY:Deconfinement on Axion Domain Walls END:VEVENT END:VCALENDAR