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Hubble Susceptibility: Beyond Effective-Mass Spectroscopy in the Cosmological Collider
cosmology-and-nongalactic-astrophysicsgeneral-relativity-and-quantum-cosmologyhigh-energy-physics-phenomenologyhigh-energy-physics-theory
In this note, we introduce the Hubble susceptibility of cosmological-collider masses, encoded in the scale dependence of the squeezed-limit oscillation. Heavy fields generically receive Hubble-induced mass corrections during inflation, and we show that the local oscillation frequency and its drift c
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