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SUMMARY:Seminar\, F. Uchida (内田 経夫\, IBS)
DTSTART;VALUE=DATE-TIME:20260212T043000Z
DTEND;VALUE=DATE-TIME:20260212T053000Z
UID:186798358382
DESCRIPTION:Title : Primordial magnetic fields during the electroweak cros
 sover and baryogenesis from magnetic helicity decay\nabstract : Magnetic f
 ields are ubiquitous in the present universe. Their existence has been dis
 cussed as a relic from the early universe\, which may be a consequence of 
 some physics beyond the Standard Model. In particular\, if primordial magn
 etic fields were generated at high temperatures\, the electroweak symmetry
  breaking implies a transition from the hyper- (U(1)Y) magnetic field in t
 he high-temperature phase to the ordinary (U(1)em) magnetic field in the l
 ow-temperature phase. However\, this transition process has been understoo
 d only naively. We characterize the evolution of magnetic fields across th
 e crossover in a gauge-invariant manner\, and point out that the baryogene
 sis scenario from magnetic helicity decay suffers from qualitative uncerta
 inty. This makes the previously-proposed cosmological constraints on primo
 rdial magnetic fields\, which concern two baryon asymmetry problems\, less
  robust. Consequently\, the co-genesis scenario for the intergalactic magn
 etic fields and the baryon asymmetry of the universe may revive.
LOCATION:541
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