Differential Geometry

Download Blow-up Theory for Elliptic PDEs in Riemannian Geometry by Olivier Druet PDF

By Olivier Druet

Elliptic equations of serious Sobolev development were the objective of research for many years simply because they've got proved to be of significant significance in research, geometry, and physics. The equations studied listed here are of the well known Yamabe style. They contain Schr?dinger operators at the left hand part and a serious nonlinearity at the correct hand facet. an important improvement within the learn of such equations happened within the Nineteen Eighties. It was once came across that the series splits right into a answer of the restrict equation--a finite sum of bubbles--and a leisure that converges strongly to 0 within the Sobolev house inclusive of sq. integrable features whose gradient can be sq. integrable. This splitting is called the quintessential thought for blow-up. during this publication, the authors advance the pointwise concept for blow-up. They introduce new rules and techniques that bring about sharp pointwise estimates. those estimates have vital purposes while facing sharp consistent difficulties (a case the place the strength is minimum) and compactness effects (a case the place the strength is arbitrarily large). The authors conscientiously and carefully describe pointwise habit whilst the strength is unfair. meant to be as self-contained as attainable, this obtainable booklet will curiosity graduate scholars and researchers in quite a number mathematical fields.

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Additional resources for Blow-up Theory for Elliptic PDEs in Riemannian Geometry (MN-45) (Mathematical Notes)

Example text

The positive solutions of this equation are known. Let n x0 ∈ S and r be the distance to x0 . Then, for any β > 1, uβ = n(n − 2) 2 (β − 1) 4 n−2 4 β − cos r 1− n 2 is a solution of the above equation. The energy of uβ is E(uβ ) = Λmin . A possible reference in book form is Hebey [44]. It is easily seen that uβ → 0 in 0 (S n \{x0 }) as β → 1. On the other hand, uβ (x0 ) → +∞ as β → 1. Thus the Cloc uβ ’s develop a singularity at x0 (they blow up at x0 ) as β → 1. Let xβ and µβ be given by 1− n 2 uβ (xβ ) = maxn uβ (x) = µβ x∈S .

2 holds for some δ ∈ (0, ig /2) small. Given δ1 < δ2 in (0, ig /2), it is easily seen that (ηδ2 ,xα − ηδ1 ,xα )Bα H12 = o(1) . 2 holds for any δ ∈ (0, ig /2). 2. 1 is the following result. 1 are also nonnegative. 2). ˆα = uα − u0 and let Proof. That u0 is nonnegative is straightforward. We let u i i µα = 1/Rα . First we prove the following: for any N integer in [1, m], and for any s integer in [0, N − 1], there exist an integer p and sequences (yαj ) and (λjα ), j N j = 1, . . 1. We proceed here by inverse induction on s.

3. ✷ As a remark, it follows from the above proof that for any i = j, j Rα Ri i j + α + Rα Rα dg (xiα , xjα )2 → +∞ j i Rα Rα as α → +∞. 3 THE DE GIORGI–NASH–MOSER ITERATIVE SCHEME FOR STRONG SOLUTIONS Given (M, g) smooth, compact, of dimension n ≥ 3, we let (hα ) be a sequence of smooth functions on M . We also let (uα ) be a bounded sequence in H12 (M ) of nonnegative solutions of 2 −1 . ∆g uα + hα uα = uα (Eα ) As already mentioned, it is easily seen that (uα ) is a Palais-Smale sequence for (Eα ).

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