By Fabrice Bethuel, Gerhard Huisken, Stefan Müller, Klaus Steffen (auth.), Stefan Hildebrandt, Michael Struwe (eds.)

ISBN-10: 3540488138

ISBN-13: 9783540488132

ISBN-10: 3540659773

ISBN-13: 9783540659778

The overseas summer season college on Calculus of diversifications and Geometric Evolution difficulties was once held at Cetraro, Italy, 1996. The contributions to this quantity mirror really heavily the lectures given at Cetraro that have supplied a picture of a reasonably huge box in research the place lately we've seen many vital contributions. one of the subject matters taken care of within the classes have been variational tools for Ginzburg-Landau equations, variational versions for microstructure and section transitions, a variational therapy of the Plateau challenge for surfaces of prescribed suggest curvature in Riemannian manifolds - either from the classical standpoint and within the atmosphere of geometric degree theory.

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**Additional info for Calculus of Variations and Geometric Evolution Problems: Lectures given at the 2nd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Cetraro, Italy, June 15–22, 1996**

**Example text**

There is azi absolute constant tlo > 0, such that, for suFBciently smM1 e, ( G L , ) on D 2 with g = exp idO has at least/~0[d[ 2 of solutions. Remark : Recently, in a joint work with B. Helffer, we have been able to show that the estimate in Proposition 15 is in some sense optimal. More precisely, we proved (see [BH]) that ttiere is some constant #1 > 0 such that the Morse Index of v, is less than ~lldl 2. 2. Variational methods Here we come back to the general case, without symmetries. In view of the previous analysis one might expect to find more solutions as d increases.

At has to be critical for the renormaiized energy. 29 In the next section we will pursue a rather different issue, namely we will try to construct non-minimizing solutions. In view of Theorem 2 a natural question is also to know if one is able to prescribe the multiplicities of the vortices. VI. 1. An example Take ~ = D 2 and the boundary value g of the form g(O) = exp idO (for d E IN*). In view of the symmetry, one can find solutions of the Ginzburg-Landau equation of the form (in polar coordinates) v~(r, 0) = fd,~(r) exp idO, where the function fa,t is solution on [0,1] of the ODE (36) r2f '' + r f ' - d 2 f f(0)=0, +~f(l-f2)=O on[0,1] f(1)=l.

5 Fully nonlinear flows Tile Gauss curvature flow, where the speed f = - K = - ( ) h " " X,) is the product of the principle curvatures, was first introduced by Firey [20] as a model for the changing shape of a tumbling stone being worn from all directions with uniform intensity. The flow is parabolic only in the class of convex surfaces and much more nonlinear in its analytic behaviour than the mean curvature flow. Tso [52] proved existence, uniqueness and convergence of closed convex hypersurfaces to a point for this flow without however determining the limiting shape of the contracting surface.

### Calculus of Variations and Geometric Evolution Problems: Lectures given at the 2nd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Cetraro, Italy, June 15–22, 1996 by Fabrice Bethuel, Gerhard Huisken, Stefan Müller, Klaus Steffen (auth.), Stefan Hildebrandt, Michael Struwe (eds.)

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