Maths HEP Lunchtime Seminars: Defect Formation with Bulk Fields
16 March 2007 13:00 in CM221
Topological defects are expected to be formed
at the end of brane inflation, when a brane and
and anti-brane collide and annihilate. The
formation of these topological defects can
be described by the evolution of a scalar
field, the tachyon, which lives inside the
worldvolume of the brane-anti-brane system.
Traditionally, studies of the tachyon evolution
have ignored the coupling with bulk fields,
fields which can propagate in the entire
We investigate the effect of the bulk fields
on the formation and evolution of topological
defects both analytically and by lattice simulations.
While the formation of the defects is only
weakly influenced by the bulk fields, their
evolution changes radically. The bulk fields
can mediate long-range interactions between
the defects, effectively causing local defects
to behave like global ones.