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Vacuum instability in the presence of solitons

Brijesh Kumar
Indian Institute of Technology Bombay, Mumbai, Inde et Groupe de physique des particules Université de Montréal

Metastable vacua appear in many models of high energy physics such as supersymmetry breaking models. Stability of the false vacua against quantum tunneling is usually assumed to be sufficient to ensure viability of such models. In this talk, I discuss a new type of classical instability of the false vacuum when topological solitons are present. If the topology of the vacuum manifold allows for the existence of defects such as cosmic strings or monopoles, the true vacuum can be "seeded" within the cores of these defects and render the false vacuum parametrically unstable. I discuss two recently published examples of such instabilities.

Thursday, 28 January, 2010 - 15:30
Seminar Location: 
Pavillon Roger-Gaudry, V-221
Refreshments Time and Location: 
café et biscuits à 15h00, au V-221

Groupe de Physique des particules
​Université de Montréal
C.P. 6128, Succ. Centre-ville,
Montréal, QC H3C 3J7
Tél : 514-343-5607
Fax : 514-343-7357