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In theoretical physics, the Weinberg–Witten theorem, proved by Steven Weinberg and Edward Witten, states that massless particles with spin j > 1/2 cannot carry a Lorentz-covariant current, while massless particles with spin j > 1 cannot carry a Lorentz-covariant stress-energy. The theorem is usually interpreted to mean that the graviton cannot be a composite particle in a relativistic quantum field theory.
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