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Solid Soft Theorems
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We derive cosmological soft theorems for solids coupled to gravity. To this end, we first derive all cosmological adiabatic modes for solids, which display the interesting novelty of non-vanishing anisotropic stresses on large scales. Then, from the corresponding symmetries of the action of perturbations we compute the leading order related soft theorems using the operator product expansion. For the scalar bispectrum, we re-derive the result that Maldacena's consistency relation is recovered only upon angular averaging over the long mode direction. In addition, we find theorems for soft tensor and vector perturbations. In passing, we also clarify the derivation of these soft theorems in gauges where no residual diffeomorphisms exist.
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Cited by 1 Pith paper
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Cosmological Polytopes and the Wavefuncton of the Universe for Light States
A recursive and polytope-based description of the wavefunction of the universe is developed for light massive scalars, with flat-space amplitudes encoded in higher-codimension faces.
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