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- 1Do quantum fields' energy prove they are real?●Quantum fields carry energy. Does that prove that they’re real? In quantum physics, we often argue over "what is real?"
Astrophysicist Ethan Siegel argues that quantum fields have a compelling claim to physical reality because they carry energy, unlike contested concepts such as the wavefunction or eigenstates. The piece revisits a long-running debate in quantum physics over what counts as real, prompting discussion among physicists and science readers about whether energy is enough to settle the question.