Equilibrium maps between metric spaces

  • Jürgen Jost
Article

Abstract

We show the existence of harmonic mappings with values in possibly singular and not necessarily locally compact complete metric length spaces of nonpositive curvature in the sense of Alexandrov. As a technical tool, we show that any bounded sequence in such a space has a subsequence whose mean values converge. We also give a general definition of harmonic maps between metric spaces based on mean value properties andΓ-convergence.

Mathematics subject classification

58E20 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [A1]
    Al'ber, S.I.: On n-dimensional problems in the calculus of variations in the large. Sov. Math. Dokl.5, 700–804 (1964)Google Scholar
  2. [A2]
    Al'ber, S.I.: Spaces of mappings into a manifold with negative curvature. Sov. Math. Dokl.9, 6–9 (1967)Google Scholar
  3. [AB]
    Alexander, S., Bishop, R.: The Hadamard-Cartan theorem in locally convex metric spaces. L'Ens. Math.36, 309–320 (1990)Google Scholar
  4. [BBH]
    Bethuel, F., Brézis, H., Hélein, F.: Ginzburg-Landau vorticesGoogle Scholar
  5. [BD]
    Beurling, A., Deny, J.: Dirichlet spaces. Proc. NAS45, 208–215 (1959)Google Scholar
  6. [C]
    Corlette, K.: Flat G-bundles with canonical metrics. J. Differ. Geom.28, 361–382 (1988)Google Scholar
  7. [CFL]
    Courant, R., Friedrichs, K., Lewy, H.: Über die partiellen Differentialgleichungen der mathematischen Physik. Math. Ann.100, 32–74 (1928)Google Scholar
  8. [D]
    Donaldson, S.: Twisted harmonic maps and the self-duality equations. Proc. London Math. Soc.55, 127–131 (1987)Google Scholar
  9. [dM]
    Maso, G. dal: An introduction to Γ-convergence. Boston Basel: Birkhäuser, 1993Google Scholar
  10. [DO]
    Diederich, K., Ohsawa, T.: Harmonic mappings and disk bundles over compact Kähler manifolds. Publ. Res. Inst. Math. Sci.21, 819–833 (1985)Google Scholar
  11. [ES]
    Eells, J., Sampson, J.: Harmonic mappings of Riemannian manifolds. Am. J. Math.85, 109–160 (1964)Google Scholar
  12. [Fe]
    Federer, H.: Geometric measure theory. Berlin Heidelberg New York: Springer, 1969Google Scholar
  13. [GS]
    Gromov, M., Schoen, R.: Harmonic maps into singular spaces and p-adic superrigidity for lattices in groups of rank oneGoogle Scholar
  14. [H]
    Hartman, P.: On homotopic harmonic maps. Can. J. Math.19, 673–687 (1967)Google Scholar
  15. [J1]
    Jost, J.: Existence proofs for harmonic mappings with the help of a maximum principle. Math. Z.184, 489–496 (1983)Google Scholar
  16. [J2]
    Jost, J.: Two-dimensional geometric variational problems. New York: John Wiley-Interscience, 1991Google Scholar
  17. [J3]
    Jost, J.: Riemann surfaces. Berlin Heidelberg New York: Springer (to appear)Google Scholar
  18. [JY1]
    Jost, J., Yau, S.T.: Harmonic maps and group representations. In: Lawson, B., Teneblat, K. (eds.) Differential Geometry and Minimal Submanifolds. Harlow London New York: Longman Scientific, 1991, pp. 241–260Google Scholar
  19. [JY2]
    Jost, J., Yau, S.T.: Harmonic maps and superrigidity. Proc. Symp. Pure Math. 54, Part1, 245–280 (1993)Google Scholar
  20. [JY3]
    Jost, J., Yau, S.T.: A nonlinear elliptic system for maps from Hermitian to Riemannian manifolds and rigidity theorems in Hermitian geometry. Acta math.170, 221–254 (1993)Google Scholar
  21. [K]
    Kendall, W.: Brownian motion and partial differential equations: from the heat equation to harmonic maps. Proc. ISI 49th Session, Firenze 1993, pp. 85–101Google Scholar
  22. [KS]
    Korevaar, N., Schoen, R.: Sobolev spaces and harmonic maps for metric space targets. Comm. Anal. Geom. (to appear)Google Scholar
  23. [La]
    Labourie, F.: Existence d'applications harmoniques tordues à valeurs dans les variétés à courbure négativeGoogle Scholar
  24. [Le]
    Lemaire, L.: Applications harmoniques de surfaces Riemanniennes J. Differ. Geom.13, 51–78 (1978)Google Scholar
  25. [MSY]
    Mok, N., Siu, Y.T., Yeung, S.K.: Geometric superrigidity. Invent. Math.113, 57–84 (1993)Google Scholar
  26. [N1]
    Nikolaev, I.G.: Solution of Plateau problem in spaces with curvature ≤K. Sib. Math. J.20, 346–353 (1979)Google Scholar
  27. [N2]
    Nikolaev, I.G.: Synthetic methods in Riemannian geometry. Lecture NotesGoogle Scholar
  28. [SU1]
    Sacks, J., Uhlenbeck, K.: The existence of minimal immersions of 2-spheres. Ann. Math.113, 1–24 (1981)Google Scholar
  29. [SU2]
    Sacks, J., Uhlenbeck, K.: Minimal immersions of closed Riemann surfaces. Trans. AMS271, 639–652 (1982)Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Jürgen Jost
    • 1
  1. 1.Fakultät für MathematikRuhr-Universität BochumBochumGermany

Personalised recommendations