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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Maths HEP Lunchtime Seminars: The Stability of D-term Strings

Presented by Paul Smyth, K.U. Leuven

27 October 2006 00:00 in CM221

Cosmic F- and D-strings in string theory have received considerable
attention recently. Networks of such strings have complicated
dynamics and cosmological consequences, however it is surprising to
note the even the stability of an isolated string solution is not yet
fully understood. We address this problem by reconsidering the energy
of the D-term string in 4D supergravity with F.I. terms, conjectured
to be the low-energy limit of the D-string. We show that within the
4D supergravity sector, such strings are non-perturbatively stable
using spinorial methods. This greatly improves on current Bogomol'nyi
bound arguments and may have interesting consequences for braneworld
models in six dimensions.

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