6533b839fe1ef96bd12a5bf4
RESEARCH PRODUCT
Quantum transport and the phase space structure of the Wightman functions
Olli KoskivaaraOlli KoskivaaraKimmo KainulainenKimmo KainulainenKimmo KainulainenHenri JukkalaHenri Jukkalasubject
High Energy Physics - TheoryNuclear and High Energy PhysicsAstrophysics and AstronomyLEPTOGENESISCosmology and Nongalactic Astrophysics (astro-ph.CO)Quantum decoherencegr-qcFOS: Physical sciencesSemiclassical physicsGeneral Relativity and Quantum Cosmology (gr-qc)114 Physical sciences01 natural sciencesGeneral Relativity and Quantum CosmologyHigh Energy Physics - Phenomenology (hep-ph)0103 physical scienceslcsh:Nuclear and particle physics. Atomic energy. RadioactivityThermal Field Theory010306 general physicsQuantumELECTROWEAK BARYOGENESISParticle Physics - PhenomenologyPhysicsThermal quantum field theory010308 nuclear & particles physicsGeneral Relativity and Cosmologyhep-thhep-phFermionFERMIONSBaryogenesisHigh Energy Physics - PhenomenologyCP violationClassical mechanicsHigh Energy Physics - Theory (hep-th)Phase spaceastro-ph.COlcsh:QC770-798Quantum Dissipative SystemsParticle Physics - TheoryAstrophysics - Cosmology and Nongalactic AstrophysicsCoherence (physics)description
We study the phase space structure of exact quantum Wightman functions in spatially homogeneous, temporally varying systems. In addition to the usual mass shells, the Wightman functions display additional coherence shells around zero frequency $k_0=0$, which carry the information of the local quantum coherence of particle-antiparticle pairs. We find also other structures, which encode non-local correlations in time, and discuss their role and decoherence. We give a simple derivation of the cQPA formalism, a set of quantum transport equations, that can be used to study interacting systems including the local quantum coherence. We compute quantum currents created by a temporal change in a particle's mass, comparing the exact Wightman function approach, the cQPA and the semiclassical methods. We find that the semiclassical approximation, which is fully encompassed by the cQPA, works surprisingly well even for very sharp temporal features. This is encouraging for the application of semiclassical methods in electroweak baryogenesis with strong phase transitions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-10-24 |