Geodesic
Positively Curved Riemannian Locally Symmetric Spaces are Positively Squared Distance Curved
Canadian journal of mathematics, Tome 65 (2013) no. 4, pp. 757-767

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DOI

The squared distance curvature is a kind of two-point curvature the sign of which turned out to be crucial for the smoothness of optimal transportation maps on Riemannian manifolds. Positivity properties of that new curvature have been established recently for all the simply connected compact rank one symmetric spaces, except the Cayley plane. Direct proofs were given for the sphere, and an indirect one (via the Hopf fibrations) for the complex and quaternionic projective spaces. Here, we present a direct proof of a property implying all the preceding ones, valid on every positively curved Riemannian locally symmetric space.
DOI : 10.4153/CJM-2012-015-1
Mots-clés : 53C35, 53C21, 53C26, 49N60, symmetric spaces, rank one, positive curvature, almost-positive c-curvature 
Delanoë, Philippe; Rouvière, François. Positively Curved Riemannian Locally Symmetric Spaces are Positively Squared Distance Curved. Canadian journal of mathematics, Tome 65 (2013) no. 4, pp. 757-767. doi: 10.4153/CJM-2012-015-1
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     title = {Positively {Curved} {Riemannian} {Locally} {Symmetric} {Spaces} are {Positively} {Squared} {Distance} {Curved}},
     journal = {Canadian journal of mathematics},
     pages = {757--767},
     year = {2013},
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