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hep-th2025
False and genuine decoherence in the early universe: a local observer and time-averaged observables
Fumiya Sano, Junsei Tokuda
We study quantum decoherence of curvature perturbations at superhorizon scales caused by the gravitational nonlinearities. We show that cubic gravitational couplings, constrained b…
hep-th2025★ 5 cited
Holographic Entanglement Entropy in the FLRW Universe
Toshifumi Noumi, Fumiya Sano, Yu-ki Suzuki
We compute a holographic entanglement entropy via Ryu--Takayanagi prescription in the three-dimensional Friedmann--Lemaître--Robertson--Walker universe. We consider two types of ho…