Abstract
We prove that the integral of the Ricci curvature on the unit tangent bundle SM of a complete Finsler manifold M without conjugate points is nonpositive and vanishes only if M is flat, provided that the Ricci curvature on SM has an integrable positive or negative part.
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Kim, CW. Finsler manifolds without conjugate points and with integral Ricci curvature. Isr. J. Math. 189, 135–146 (2012). https://doi.org/10.1007/s11856-011-0129-y
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DOI: https://doi.org/10.1007/s11856-011-0129-y