Quantum Cosmology
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Quantum Open System Formulation of Stochastic Inflation
This work formulates stochastic inflation using an open quantum system approach. By treating the coarse-grained field and momentum in a patch as a quantum system, the entanglement with external modes induces non-unitary evolution. This leads to GKLS dynamics in de Sitter space, unifying diffusion an…
Nontrivial Sound Speed Imprints Quantum Information Signatures in Inflationary Perturbations
Analyzes quantum-information measures (purity, von Neumann entropy, Rényi entropies, logarithmic negativity) for cosmological perturbations in a normalized open two-mode squeezed-state framework with modified sound speed. Demonstrates that nontrivial sound speed alters squeezing parameters r_k and φ…