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Hypermagnetic Baryogenesis
Kazuharu Bamba, C. Q. Geng, S. H. Ho
We study a new scenario for baryogenesis due to the spontaneous breaking of the invariance through the interaction between a baryon current and a hypermagnetic helicity. The…
The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields during inflation
Kazuharu Bamba
The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields due to the breaking of the conformal invariance of the electromagnet…
Accelerating Cosmologies in the Einstein-Gauss-Bonnet Theory with Dilaton
Kazuharu Bamba, Zong-Kuan Guo, Nobuyoshi Ohta
We study cosmological solutions in the low-energy effective heterotic string theory, which is the Einstein gravity with Gauss-Bonnet term and the dilaton. We show that the field eq…
Property of the spectrum of large-scale magnetic fields from inflation
Kazuharu Bamba
The property of the spectrum of large-scale magnetic fields generated due to the breaking of the conformal invariance of the Maxwell theory through some mechanism in inflationary c…