An electron freely falls in the Earth's gravity, while being enclosed in a cylinder that contains energy detectors. The electron accelerates and therefore radiates energy, which is detected. However, when viewed from a local inertial (free-falling) frame, the electron is stationary and does not radiate. This paradox has been presented before here, but I find the answers unsatisfying. The detector either registers something or not.
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This question has been answered here before. The electron does not radiate because its field is also accelerated. – my2cts Sep 06 '21 at 23:18
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Whether or not you're satisfied with the answer itself, this answer at least includes a good list of references. – Chiral Anomaly Sep 06 '21 at 23:46