August 23, 2021 to October 7, 2021
Venue: OAC conference center, Kolymbari, Crete, Greece. Participation is possible also via internet.
Europe/Athens timezone

Magnetic Fields in early Universe

Aug 25, 2021, 6:00 PM
Room 1

Room 1


Prof. Stanislav Vilchinskii (Taras Shevchenko National University of Kyiv (UA))


One of the big problems of modern cosmology is to explain the origin of cosmic magnetic fields (MF). Observations show that galaxies have MF with a component coherent over a large fraction of the galaxy with strengths of microGauss order. These MF are supposed to be the result of amplification of initial weak seed MF of unknown nature. Moreover, analysis of the gamma-ray observations from distant blazars together with observations of the cosmic microwave background (CMB) and ultra-high-energy cosmic rays indicates the presence of MF in intergalactic voids of the Universe. Their large coherence length, measured in Megaparsecs, suggests that these MF could have been generated during the earliest stage of the Universe evolution, which is inflation. For now, it is unclear whether MF detected in cosmological voids are helical or not. The answer to this question is very important because it may shed light on possible mechanism of MF generation and their evolution until the present time. In a hot turbulent plasma, helical MF undergo the inverse cascade when the competition between helicity conservation and magnetic diffusion results in the rearrangement of MF spectrum and increase of their comoving correlation length. Helical MF can be amplified in an ultrarelativistic plasma with chiral asymmetry due to the chiral magnetic effect .
We discuss the generation of MF in inflationary models and their evolution in primordial ultrarelativistic plasma with chiral asymmetry, investigate the Schwinger effect in expanding Universe, and analyze the impact of this effect on the process of generation of MF in the early Universe. We try to improve our understanding of the origin of MF and their evolution during the Universe expansion, from the moment of their generation until today, and try to determine which of the inflationary magnetogenesis mechanisms are the most favorable (or excluded) by the present observational data.


Prof. Stanislav Vilchinskii
TSKNU, Kiev, Ukraine

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Prof. Stanislav Vilchinskii (Taras Shevchenko National University of Kyiv (UA))

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