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- W4313332589 abstract "In some instances of study of quantum evolution of classical backgrounds it is considered inevitable to resort to nonperturbative methods at the price of treating the system semiclassically. We show that a fully quantum perturbative treatment, in which the background is resolved as a multiparticle state, recovers the semiclassical nonperturbative results and allows going beyond. We reproduce particle creation by a classical field in a theory of two scalars as well as in scalar QED in terms of scattering processes of high multiplicity. The multiparticle treatment also gives a transparent picture of why a single-process transition from a classical to a quantum state, which we call quantumization, is exponentially suppressed, whereas the opposite process, classicalization, can take place swiftly if the microstate degeneracy of the classical state is high. An example is provided by the $N$-graviton portrait of a black hole: a black hole can form efficiently via a $2ensuremath{rightarrow}N$ classicalization process in the collision of high-energy particles, but its quantumization via a decay $Nensuremath{rightarrow}2$ is exponentially suppressed." @default.
- W4313332589 created "2023-01-06" @default.
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- W4313332589 date "2022-12-29" @default.
- W4313332589 modified "2023-09-27" @default.
- W4313332589 title "Perturbative understanding of nonperturbative processes and quantumization versus classicalization" @default.
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- W4313332589 doi "https://doi.org/10.1103/physrevd.106.125019" @default.
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