The generation of matter–antimatter asymmetries and hypermagnetic fields by the chiral vortical effect of transient fluctuations

• Published in: The European physical journal. C, Particles and fields Vol. 81; no. 6; pp. 1 - 14
• Main Authors: Abbaslu, S., Rostam Zadeh, S., Mehraeen, M., Gousheh, S. S.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-06-2021; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Antimatter; Astronomy; Astrophysics and Cosmology; Asymmetry; Cosmology; Electric currents; Elementary Particles; Evolution; Hadrons; Heavy Ions; Magnetic fields; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Particle physics; Phase transitions; Physics; Physics and Astronomy; Plasma; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; String Theory; Temperature dependence; Vorticity
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-021-09272-9

We study the contribution of the temperature-dependent chiral vortical effect to the generation and evolution of hypermagnetic fields and matter-antimatter asymmetries, in the symmetric phase of the early Universe, in the temperature range 100 GeV
≤
T
≤
10 TeV. Our most important result is that, due to the chiral vortical effect, small overlapping transient fluctuations in the vorticity field in the plasma and temperature of matter degrees of freedom can lead to the generation of strong hypermagnetic fields and matter-antimatter asymmetries, all starting from zero initial values. We show that, either an increase in the amplitudes of the fluctuations of vorticity or temperature, or a decrease in their widths, leads to the production of stronger hypermagnetic fields, and therefore, larger matter-antimatter asymmetries. We have the interesting result that fluctuating vorticity fields are more productive, by many orders of magnitude, as compared to vorticities that are constant in time.