Name: Urjit Yajnik
 Institution: Indian Institute of Technology Bombay
 Title: Cosmology with new symmetries at the TeV scale
 Key Words: B-L, left-right symmetry, supersymmetry, leptogenesis
 Abstract: We discuss some implications of gauged B-L symmetry, left-right symmetry 
and supersymmetry being accessible at low scales beyond the TeV scale. We 
have derived  bounds on the operators  that can ensure safe disappearance  
of the domain walls and have explored the parameter range that can also ensure 
adequate leptogenesis. I next  discuss the origin of the operators that 
ensure safe completion of the phase transition, specifically whether they 
must be gravity induced, or can arise from the hidden sector via gauge 
mediation. We discuss the simplest model of gauge mediation within which
to achieve this and the attendant constraints.