Affine Bernstein Problems and Monge-Ampère Equations by An-Min Li, Ruiwei Xu, Udo Simon, Fang Jia PDF

By An-Min Li, Ruiwei Xu, Udo Simon, Fang Jia

ISBN-10: 9812814167

ISBN-13: 9789812814166

During this monograph, the interaction among geometry and partial differential equations (PDEs) is of specific curiosity. It provides a selfcontained advent to investigate within the final decade relating international difficulties within the concept of submanifolds, resulting in a few forms of Monge-Ampère equations. From the methodical viewpoint, it introduces the answer of sure Monge-Ampère equations through geometric modeling suggestions. right here geometric modeling capacity the best number of a normalization and its brought about geometry on a hypersurface outlined by means of an area strongly convex international graph. For a greater figuring out of the modeling recommendations, the authors supply a selfcontained precis of relative hypersurface thought, they derive very important PDEs (e.g. affine spheres, affine maximal surfaces, and the affine consistent suggest curvature equation). referring to modeling recommendations, emphasis is on rigorously dependent proofs and exemplary comparisons among varied modelings.

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Extra resources for Affine Bernstein Problems and Monge-Ampère Equations

Example text

This shows that x is a parabolic affine hypersphere. Theorem. 2) of Monge-Amp`ere type. 2 Proper affine hyperspheres Let x be an elliptic or hyperbolic affine hypersphere and assume that x locally is given as a graph of a strictly convex C ∞ -function on a domain Ω ⊂ Rn : xn+1 = f x1 , · · ·, xn , x1 , · · ·, xn ∈ Ω. 4: F : Ω → Rn where (x1 , · · ·, xn ) → (ξ1 , · · ·, ξn ) and ξi := ∂i f = ∂f ∂xi , i = 1, 2, · · ·, n. 5in ws-book975x65 The Theorem of J¨ orgens-Calabi-Pogorelov 49 When Ω is convex, F : Ω → F (Ω) is a diffeomorphism.

Lemma. For a given hypersurface x and two different normalizations (U, z) and (U , z ), the induced bilinear forms h and h in the structure equations satisfy h = q · h for some non-zero factor q ∈ C ∞ (M ). As a consequence, the rank of h does not depend on the choice of the transversal field z, it is a property of the hypersurface x itself. Non-degenerate hypersurfaces. x is called non-degenerate if, for an arbitrary normalization, rank h = n. If x is non-degenerate the class C = {h} can be considered as a conformal class of semi-Riemannian metrics; in the definite case, by an appropriate orientation of the normalization, the class C is positive definite and thus it is a class of Riemannian metrics.

The pair (x, Y ) is invariant under unimodular transformations of An+1 . 5in ws-book975x65 Affine Bernstein Problems and Monge-Amp` ere Equations 20 to the Euclidean unit normal the transversal field Y has the property that dY (v) is tangential to x(M ) for any tangent vector v ∈ M . But Y does not fix the tangent plane. We recall the notion of the conormal line bundle along M and call any nowhere vanishing section of this bundle a conormal field on M . We are going to search for a conormal field that is invariant under unimodular transformations.

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Affine Bernstein Problems and Monge-Ampère Equations by An-Min Li, Ruiwei Xu, Udo Simon, Fang Jia


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