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i am trying to understand why dr/dTau must be negative for a future-directed (physical) observer in the Schwarzschild metric. it says
"we also know (e.g. from the Kruskal picture) that the sign of dr/dTau must be negative for a "future-directed" (i.e. physical) observer"
i am probably missing something obvious.
"we also know (e.g. from the Kruskal picture) that the sign of dr/dTau must be negative for a "future-directed" (i.e. physical) observer"
i am probably missing something obvious.