Shin-ichi OHTA

Department of Mathematics, Kyoto University, Kyoto 606-8502, Japan

Report of Workshop on Finsler Geometry in Kyoto, 2011 (in Japanese)
Differential Topology Seminar (in Japanese only)

Research interest

Comparison geometry involving various kinds of curvature, and its applications.
Keywords:
Riemannian geometry, Alexandrov spaces, CAT-spaces, analysis on metric measure spaces,
optimal transport theory, Wasserstein geometry, gradient flows,
Finsler geometry, the geometry of Banach spaces...
Here is my brief curriculum vitae.

Preprints

  1. Examples of spaces with branching geodesics satisfying the curvature-dimension condition, Jan 2013 (PDF).
  2. (with Alexandru KRISTÁLY) Caffarelli-Kohn-Nirenberg inequality on metric measure spaces with applications, Nov 2012 (Revised 25 Feb 2013; PDF),
    to appear in Math. Ann.
  3. (with Kei KONDO & Minoru TANAKA) Topology of complete Finsler manifolds with radial flag curvature bounded below, Oct 2012 (PDF).
  4. (with Kei KONDO & Minoru TANAKA) A Toponogov type triangle comparison theorem in Finsler geometry, May 2012 (PDF).
  5. Weighted Ricci curvature estimates for Hilbert and Funk geometries, Mar 2012 (PDF),
    to appear in Pacific J. Math.
  6. Splitting theorems for Finsler manifolds of nonnegative Ricci curvature, Feb 2012 (Revised 23 Jan 2013; PDF),
    to appear in J. Reine Angew. Math.
  7. (with Asuka TAKATSU) Displacement convexity of generalized relative entropies. II, Dec 2011 (Revised 13 Mar 2013; PDF),
    to appear in Comm. Anal. Geom.
  8. (with Karl-Theodor STURM) Bochner-Weitzenböck formula and Li-Yau estimates on Finsler manifolds, Apr 2011 (Revised 26 Sep 2012; PDF).

Published papers

(PDF files are of preprint versions, they may be different from published ones.)
  1. (with Nicola GIGLI & Kazumasa KUWADA) Heat flow on Alexandrov spaces, Comm. Pure Appl. Math. 66 (2013), 307-331 (PDF).
  2. (with Karl-Theodor STURM) Non-contraction of heat flow on Minkowski spaces, Arch. Ration. Mech. Anal. 204 (2012), 917-944 (PDF).
  3. (with Nicola GIGLI) First variation formula in Wasserstein spaces over compact Alexandrov spaces, Canad. Math. Bull. 55 (2012), 723-735 (PDF).
  4. Barycenters in Alexandrov spaces of curvature bounded below, Adv. Geom. 12 (2012), 571-587 (PDF).
  5. (with Asuka TAKATSU) Displacement convexity of generalized relative entropies, Adv. Math. 228 (2011), 1742-1787 (PDF).
  6. Vanishing S-curvature of Randers spaces, Differential Geom. Appl. 29 (2011), 174-178 (PDF).
  7. (with Karl-Theodor STURM) Heat flow on Finsler manifolds, Comm. Pure Appl. Math. 62 (2009), 1386-1433
    (PDF; minor revisions in Lemma 3.8 & Theorem 3.9).
  8. Finsler interpolation inequalities, Calc. Var. Partial Differential Equations 36 (2009), 211-249 (PDF).
  9. (with Mikaël PICHOT) A note on Markov type constants, Arch. Math. (Basel) 92 (2009), 80-88 (PDF).
  10. Uniform convexity and smoothness, and their applications in Finsler geometry, Math. Ann. 343 (2009), 669-699 (PDF).
  11. Extending Lipschitz and Hölder maps between metric spaces, Positivity 13 (2009), 407-425 (PDF).
  12. Gradient flows on Wasserstein spaces over compact Alexandrov spaces, Amer. J. Math. 131 (2009), 475-516 (PDF).
  13. Markov type of Alexandrov spaces of nonnegative curvature, Mathematika 55 (2009), 177-189 (PDF).
  14. (with Kei KONDO) Topology of complete manifolds with radial curvature bounded from below, Geom. Funct. Anal. 17 (2007), 1237-1247.
  15. Products, cones, and suspensions of spaces with the measure contraction property, J. Lond. Math. Soc. (2) 76 (2007), 225-236 (PDF).
  16. On the measure contraction property of metric measure spaces, Comment. Math. Helv. 82 (2007), 805-828 (PDF).
  17. Convexities of metric spaces, Geom. Dedicata 125 (2007), 225-250 (PDF).
  18. Reconstructions of distances by energy forms, Proc. Amer. Math. Soc. 134 (2006), 3405-3415.
  19. Regularity of harmonic functions in Cheeger-type Sobolev spaces, Ann. Global Anal. Geom. 26 (2004), 397-410.
  20. Harmonicity of totally geodesic maps into nonpositively curved metric spaces, Manuscripta Math. 114 (2004), 127-138.
  21. Cheeger type Sobolev spaces for metric space targets, Potential Anal. 20 (2004), 149-175.
  22. Totally geodesic maps into metric spaces, Math. Z. 244 (2003), 47-65.

Other publications

  1. Harmonic maps and totally geodesic maps between metric spaces, Dissertation, Tohoku University, 2003.
    Published in Tohoku Mathematical Publications 28, Tohoku University, 2004.
  2. Optimal transport and Ricci curvature in Finsler geometry, Adv. Stud. Pure Math. 57 (2010), 323-342 (PDF).
    --Survey article on "Finsler interpolation inequalities" and "Heat flow on Finsler manifolds".
  3. Ricci curvature, entropy and optimal transport (Revised 1 Jul 2010; PDF), to appear in Séminaires et Congrès.
    --Extended lecture notes for Summer School in Grenoble 2009.

Articles in Japanese