BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Lewis & Clark//NONSGML v1.0//EN BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT TZNAME:PDT DTSTART:20200308T100000 RDATE:20200308T100000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 END:DAYLIGHT END:VTIMEZONE BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:STANDARD TZNAME:PST DTSTART:20201101T090000 RDATE:20201101T090000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20200127T161500 DTEND;TZID=America/Los_Angeles:20200127T171500 LOCATION:Olin 204 SUMMARY:Physics Colloquium: Mohamed Anber DESCRIPTION:Please join us at 4:00 pm in the Olin lobby for cookies and c onversation. Title: Deconfinement on Axion Domain Walls Abstract: The g eneral lore\, according to effective field theory\, is that one ignores t he high energy degrees of freedom when studying low energy phenomena. For example\, and as a matter of fact\, we do not need to understand quantum chromodynamics (QCD) (the strong nuclear force) to understand fluid mech anics! However\, the existence of 't Hooft anomalies (subtle phases in th e partition function) may signal a non-trivial intertwining between the h igh and low energy scales. This nontrivial assertion can be seen in axion physics\;axion is a hypothetical particle that may play important roles in solving a few puzzles in the Universe.After a brief introduction to QC D and axions\, I show how this intertwining takes place on axion domain w alls (a domain wall (DW) is the boundary between two neighboring domains) . To this end\, I first discuss a new class of 't Hooft anomalies that I recently identified\, and then use the anomalies to argue that quarks are deconfined (liberated) on axion DW. This newly discovered phenomenon imp lies that a non-trivial interplay between different scales happens on the walls. Further\, I confirm this picture by performing explicit calculati ons in a toy model\, which is argued to be continuously connected to the full-fledged QCD. X-ALT-DESC;FMTTYPE=text/html:
Please join us at 4:00 pm in the Olin
lobby for cookies and conversation.
Title: Dec
onfinement on Axion Domain Walls
Abstract: The general l ore\, according to effective field theory\, is that one ignores the high energy degrees of freedom when studying low energy phenomena. For example \, and as a matter of fact\, we do not need to understand quantum chromod ynamics (QCD) (the strong nuclear force) to understand fluid mechanics! H owever\, the existence of 't Hooft anomalies (subtle phases in the partit ion function) may signal a non-trivial intertwining between the high and low energy scales. This nontrivial assertion can be seen in axion physics \;axion is a hypothetical particle that may play important roles in solvi ng a few puzzles in the Universe.After a brief introduction to QCD and ax ions\, I show how this intertwining takes place on axion domain walls (a domain wall (DW) is the boundary between two neighboring domains). To thi s end\, I first discuss a new class of 't Hooft anomalies that I recently identified\, and then use the anomalies to argue that quarks are deconfi ned (liberated) on axion DW. This newly discovered phenomenon implies tha t a non-trivial interplay between different scales happens on the walls. Further\, I confirm this picture by performing explicit calculations in a toy model\, which is argued to be continuously connected to the full-fle dged QCD.
UID:20200128T001500Z-309418@college.lclark.edu DTSTAMP:20200122T111451Z URL:https://college.lclark.edu/live/events/309418-physics-colloquium-moha med-anber CATEGORIES:Open to the Public LAST-MODIFIED:20200122T191646Z X-LIVEWHALE-TYPE:events X-LIVEWHALE-ID:309418 X-LIVEWHALE-TIMEZONE:America/Los_Angeles X-LIVEWHALE-SUMMARY:Deconfinement on Axion Domain Walls X-LIVEWHALE-TAGS:colloquia|feature|physics END:VEVENT END:VCALENDAR