Mon, 09 Feb 2004
14:15
14:15
L3
Tue, 03 Feb 2004
12:00
12:00
L3
On Witten's Perturbative gauge theory as a string theory in twistor space
(Joint String/Relativity Seminar)
Philip Candelas/Xenia de la Ossa
(Oxford)
Mon, 26 Jan 2004
17:00
17:00
L1
Polyconvexity and counterexamples to regularity in the calculus of variations
Jonathan Bevan
(Oxford)
Abstract
Using a technique explored in unpublished work of Ball and Mizel I shall
show that already in 2 and 3 dimensions there are vectorfields which are
singular minimizers of integral functionals whose integrand is strictly
polyconvex and depends on the gradient of the map only. The analysis behind
these results gives rise to an interesting question about the relationship
between the regularity of a polyconvex function and that of its possible
convex representatives. I shall indicate why this question is interesting in
the context of the regularity results above and I shall answer it in certain
cases.
Thu, 22 Jan 2004
16:30
16:30
DH Common Room
Mon, 29 May 2006
14:15
14:15
L3