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Hiroki Matsui

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Preprint Sep 2026

Gravitational decoherence from soft-graviton $S$-matrix

We revisit gravitational decoherence of matter superpositions using the leading soft sector of the graviton $S$-matrix. Starting from Weinberg's soft theorem and the overlap of coherent radiation states, we derive, for branch configurations with the same total four-momentum, a gauge-invariant, nonnegative leading-soft...

Hiroki Matsui · 0 citations

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