Fig. 2: Feynman diagrams for QED with the approximation of classical electromagnetic fields or linear classical gravity. | Nature

Fig. 2: Feynman diagrams for QED with the approximation of classical electromagnetic fields or linear classical gravity.

From: Classical theories of gravity produce entanglement

Fig. 2

The wiggly blue lines are classical electromagnetic or gravitational fields or potentials. The crosses represent classical sources for the fields or potentials. As in Fig. 1, black lines represent electrons, positrons, or general matter or antimatter particles. For ease of visualization, double lines without arrows represent virtual particles.

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