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• W2771802151 abstract "We study the impact of attractive self-interactions on the nonequilibrium dynamics of relativistic quantum fields with large occupancies at low momenta. Our primary focus is on Bose-Einstein condensation and nonthermal fixed points in such systems. For a model system, we consider $mathcal{O}(N)$-symmetric scalar field theories. We use classical-statistical real-time simulations as well as a systematic $1/N$ expansion of the quantum (two-particle-irreducible) effective action to next-to-leading order. When the mean self-interactions are repulsive, condensation occurs as a consequence of a universal inverse particle cascade to the zero-momentum mode with self-similar scaling behavior. For attractive mean self-interactions, the inverse cascade is absent, and the particle annihilation rate is enhanced compared to the repulsive case, which counteracts the formation of coherent field configurations. For $Nensuremath{ge}2$, the presence of a nonvanishing conserved charge can suppress number-changing processes and lead to the formation of stable localized charge clumps, i.e., $Q$ balls." @default.
• W2771802151 created "2017-12-22" @default.
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• W2771802151 date "2017-10-30" @default.
• W2771802151 modified "2023-10-16" @default.
• W2771802151 title "Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories" @default.
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• W2771802151 doi "https://doi.org/10.1103/physrevd.96.076020" @default.
• W2771802151 hasPublicationYear "2017" @default.
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