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Hypermagnetic Fields and Baryon Asymmetry from Pseudoscalar Inflation
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Hypermagnetic Fields and Baryon Asymmetry from Pseudoscalar Inflation
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We show that maximally helical hypermagnetic fields produced during pseudoscalar inflation can generate the observed baryon asymmetry of the universe via the B+L anomaly in the Standard Model. We find that most of the parameter space of pseudoscalar inflation that explains the cosmological data leads to baryon overproduction, hence the models of natural inflation are severely constrained. We also point out a connection between the baryon number and topology of the relic magnetic fields. Both the magnitude and sign of magnetic helicity can be detected in future diffuse gamma ray data. This will be a smoking gun evidence for a link between inflation and the baryon asymmetry of the Universe.
Forward citations
Cited by 2 Pith papers
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Gravitational waves from axion inflation in the gradient expansion formalism. Part I. Pure axion inflation
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Even in the weak-backreaction regime, axion inflation produces high-frequency primordial gravitational waves many orders of magnitude above the vacuum spectrum, peaking around MHz–GHz.
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