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Leptogenesis in Inflationary models with Non-Abelian Gauge Fields · Around

2012

Leptogenesis in Inflationary models with Non-Abelian Gauge Fields

Maleknejad, Azadeh, Noorbala, Mahdiyar, Sheikh-Jabbari, M. M.

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A scenario of leptogenesis was introduced in [1] which works during inflationary period within standard model of particle physics setup.

In this scenario lepton number is created by the gravitational chiral anomaly which has a non-zero expectation value for models of inflation driven by pseudoscalar field(s).
Here, we observe that models of inflation involving non-Abelian gauge fields, e.g.
the chromo-natural inflation [2] or the gauge-flation [3], have a parity-violating tensor mode (graviton) spectrum and naturally lead to a non-vanishing expectation value for the gravitational chiral anomaly.

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