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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: Bubbles Unbound: Bubbles of Nothing Without Kaluza-Klein

Presented by Keith Copsey, UCSB

8 December 2006 13:00 in CM221

I will describe analytic time symmetric initial data for five
dimensions describing ``bubbles of nothing'' which are asymptotically
flat in the higher dimensional sense, i.e. there is no Kaluza-Klein
circle asymptotically. The first set of solutions consists of pairs
of bubbles where one may either choose the sizes of the two bubbles or
the size of one and the total mass of the system arbitrarily. In
particular, the solutions contain bubbles of any size which are
arbitrarily light. This suggests the solutions may be important
phenomenologically and in particular I show that at low energy there
are bubbles which expand outwards, suggesting a new possible
instability in higher dimensions. I will then discuss a much more
generic set of solutions describing expanding single bubbles both in
asymptotically flat space and in AdS.

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