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DTSTAMP:20260416T024145
DTSTART:20131127T100000
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DTEND:20131127T110000
URL:https://murmitoyen.com/events/vanille/udem/detail/337768
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:The battle of the bulge : tunneling assisted by topological objects
DESCRIPTION:Urjit Yajnik ITT\, Bombay The lowest energy state of a collecti
 ve system may often find itself in an energetically unfavorable local mini
 mum. We can estimate the rate of formation of bubbles of true ground state
 \, by reducing the problem to that of quantum tunneling for a single colle
 ctive variable\, namely the bubble radius. This is called the 'thin wall a
 pproximation'. We have studied systems in which the true vacuum is enclose
 d in the interiors of topological defects which are themselves stable\, bu
 t can act as seeds for catalyzing the formation of bubbles of true vacuum.
   Using symmetry arguments and suitable limits of parameters we are able 
 to identify the appropriate collective variable and apply the thin wall ap
 proximation to two examples\, a 2+1 dimensional vortex and a  3+1 dimensi
 onal cosmic string. In certain limits of the parameters\, the putative met
 astable state may in fact be rendered unstable\, causing a 'roll over' of 
 the system to true vacuum without recourse to any tunneling.
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