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doctoral thesis

Optimal polynomial blow up range for critical wave maps

Gao, Can  
2015

We prove that the critical Wave Maps equation with target $S^2$ and origin ℝ$^{2+1}$ admits energy class blow up solutions of the form [ u(t, r) = Q(\lambda(t)r) + \epsilon(t, r) ] where $Q:ℝ²\rightarrow S^2$ is the ground state harmonic map and $\lambda(t) = t^{-1-\nu}$ for any $\nu>0$. This extends the work, where such solutions were constructed under the assumption $\nu>\frac{1}{2}$. Also in the later chapter, we give the necessary remarks and key changes one needs to notice while the same problem is considered in a more general case while $\cal{N}$ is a surface of revolution. We are also able to extends the blow-up range in Carstea's work to $\nu>0$. In light of a result of Struwe, our results are optimal for polynomial blow up rates.

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Type
doctoral thesis
DOI
10.5075/epfl-thesis-6432
Author(s)
Gao, Can  
Advisors
Krieger, Joachim  
Jury

Prof. M. Troyanov (président) ; Prof. J. Krieger (directeur) ; Prof. G. Crippa, Prof. G. Holzegel, Prof. D. Kressner (rapporteurs)

Date Issued

2015

Publisher

EPFL

Publisher place

Lausanne

Public defense year

2015-01-08

Thesis number

6432

Subjects

critical wave equation

•

hyperbolic dynamics

•

blow-up

•

scattering

•

stability

•

invariant manifold

EPFL units
PDE  
Faculty
SB  
School
MATHAA  
Doctoral School
EDMA  
Available on Infoscience
December 22, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/109492
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