Fig. 1 | Nature Communications

Fig. 1

From: Surfaces away from horizons are not thermodynamic

Fig. 1

Schematic of the spacelike three-dimensional hypersurface of interest, Σ, with an inner boundary ∂Σin and a boundary at infinity ∂Σ. Here \(\hat N^\mu\) is the spacelike four-vector normal to the boundaries of Σ (note the direction convention on the inner boundary). We assume a general mass distribution within the inner boundary and no matter outside it

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