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Equivalence between the timelike Brunn-Minkowski inequality and timelike Bakry-\'Emery-Ricci lower bound on weighted globally hyperbolic spacetimes

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arxiv 2504.06186 v1 pith:TS4VDRVL submitted 2025-04-08 math.MG gr-qc

classification math.MGgr-qc
keywords timelikemathsfbakry-brunn-minkowskiemery-ricciequivalenceinequalitylower
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We prove the timelike Brunn-Minkowski inequality $\mathsf{TBM}(K,N)$ implies a timelike lower bound on the Bakry-\'Emery-Ricci curvature on weighted globally hyperbolic spacetimes. This result, together with the well-known equivalence between timelike Bakry-\'Emery-Ricci lower bounds and the $\mathsf{TCD}(K,N)$ condition, and the fact that $\mathsf{TCD}(K,N)$ spaces support the timelike Brunn-Minkowski inequality, draws an equivalence between $\mathsf{TBM}(K,N)$ and $\mathsf{TCD}(K,N)$ in the smooth setting.

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