Fig. 2: Propagation of wavepacket and associated null geodesics in the Schwarzschild spacetime geometry. | Communications Physics

Fig. 2: Propagation of wavepacket and associated null geodesics in the Schwarzschild spacetime geometry.

From: Towards communication in a curved spacetime geometry

Fig. 2

a The null geodesics (dashed curves) for beams that propagate very close to the event horizon—we set the event horizon at 1. b Schematic of wavepacket propagation radially in the Schwarzschild spacetime geometry. Alice and Bob are located at ra and rb, respectively, while θ and φ are polar and azimuthal angles of the standard spherical coordinates.

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