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Duration of classicality of an inhomogeneous quantum field with repulsive contact self-interactions

Arza, Ariel; Chakrabarty, Sankha S.; Enomoto, Seishi; Han, Yaqi; Todarello, Elisa

Abstract:
Quantum fields with large degeneracy are often approximated as classical fields. Here, we show how the quantum and classical evolution of a highly degenerate quantum field with repulsive contact self-interactions differ fromeach other. Initially, the field is taken to be homogeneous except for a small plane-wave perturbation in only one mode. In quantum field theory, modes satisfying both momentum and energy conservation of the quasiparticles, grow exponentially with time. However, in the classical field approximation, the system is stable. We calculate the time scale after which the classical field description becomes invalid.

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Verlagsausgabe §
DOI: 10.5445/IR/1000104396
Veröffentlicht am 19.12.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2470-0010, 2470-0029
KITopen-ID: 1000104396
HGF-Programm 51.03.06 (POF III, LK 01)
Theoretische Astroteilchenphysik
Erschienen in Physical review / D
Band 100
Heft 12
Seiten Art. Nr.: 125010
Vorab online veröffentlicht am 11.12.2019
Nachgewiesen in Web of Science
Scopus
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