# On Minimisers of $$L^p$$ L p -mean Distortion

On Minimisers of $$L^p$$ L p -mean Distortion We study the $$L^p$$ L p -mean distortion functionals, \begin{aligned} \mathcal{E}_p[f] = \int \int \limits _{\mathbb {D}}{\mathbb {K}}^p(z,f) \; \mathrm{d}z,\quad f_{|{\mathbb {S}}}=f_0 \end{aligned} E p [ f ] = ∫ ∫ D K p ( z , f ) d z , f | S = f 0 for Sobolev self homeomorphisms of the unit disk $${\mathbb {D}}$$ D with prescribed boundary values $$f_0:{\mathbb {S}}\rightarrow {\mathbb {S}}$$ f 0 : S → S and pointwise distortion function $${\mathbb {K}}={\mathbb {K}}(z,f)$$ K = K ( z , f ) . Here we discuss aspects of the existence, regularity and uniqueness questions for minimisers and discuss the diffeomorphic critical points of $$\mathcal{E}_p$$ E p presenting results we know and making some conjectures. Remarkably, smooth minimisers of the $$L^p$$ L p -mean distortion functionals have inverses which are harmonic with respect to a metric induced by the distortion of the mapping. From this we are able to deduce that the complex conjugate Beltrami coefficient of a smooth minimiser is locally quasiregular and we identify the quasilinear equation it solves. This has other consequences such as a maximum principle for the distortion. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Computational Methods and Function Theory Springer Journals

# On Minimisers of $$L^p$$ L p -mean Distortion

, Volume 14 (3) – Apr 1, 2014
18 pages

/lp/springer-journals/on-minimisers-of-l-p-l-p-mean-distortion-Ogm9qDN3rh
Publisher
Springer Journals
Subject
Mathematics; Analysis; Computational Mathematics and Numerical Analysis; Functions of a Complex Variable
ISSN
1617-9447
eISSN
2195-3724
DOI
10.1007/s40315-014-0063-1
Publisher site
See Article on Publisher Site

### Abstract

We study the $$L^p$$ L p -mean distortion functionals, \begin{aligned} \mathcal{E}_p[f] = \int \int \limits _{\mathbb {D}}{\mathbb {K}}^p(z,f) \; \mathrm{d}z,\quad f_{|{\mathbb {S}}}=f_0 \end{aligned} E p [ f ] = ∫ ∫ D K p ( z , f ) d z , f | S = f 0 for Sobolev self homeomorphisms of the unit disk $${\mathbb {D}}$$ D with prescribed boundary values $$f_0:{\mathbb {S}}\rightarrow {\mathbb {S}}$$ f 0 : S → S and pointwise distortion function $${\mathbb {K}}={\mathbb {K}}(z,f)$$ K = K ( z , f ) . Here we discuss aspects of the existence, regularity and uniqueness questions for minimisers and discuss the diffeomorphic critical points of $$\mathcal{E}_p$$ E p presenting results we know and making some conjectures. Remarkably, smooth minimisers of the $$L^p$$ L p -mean distortion functionals have inverses which are harmonic with respect to a metric induced by the distortion of the mapping. From this we are able to deduce that the complex conjugate Beltrami coefficient of a smooth minimiser is locally quasiregular and we identify the quasilinear equation it solves. This has other consequences such as a maximum principle for the distortion.

### Journal

Computational Methods and Function TheorySpringer Journals

Published: Apr 1, 2014

### References

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