6533b834fe1ef96bd129e211
RESEARCH PRODUCT
Attractive versus repulsive interactions in the Bose-Einstein condensation dynamics of relativistic field theories
A. ChatrchyanJoerg JaeckelK. BoguslavskiJürgen Bergessubject
PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)axionsAnnihilationta114Field (physics)010308 nuclear & particles physicsFOS: Physical sciencesBose-Einstein condensatesCharge (physics)01 natural scienceslaw.inventionHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Q-balllawQuantum electrodynamics0103 physical sciences010306 general physicsScalar fieldQuantumEffective actionBose–Einstein condensateAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
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. As a model system we consider O(N)-symmetric scalar field theories. We use classical-statistical real-time simulations, as well as a systematic 1/N expansion of the quantum (2PI) 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 N >= 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 | Physical Review D |