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arXiv · 2511.03794

Primordial Dirac Leptogenesis

Aqeel Ahmed·Juan P. Garcés·Manfred Lindner
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Abstract

We present a novel realization of Dirac leptogenesis based on the post-inflationary reheating phase of the early universe. An asymmetry generated within the scalar sector via CP-violating and out-of-equilibrium inflaton decays is transferred to chiral neutrinos through Yukawa interactions and then to baryons via electroweak sphalerons. We describe in detail a minimal realization of this mechanism that naturally accommodates small neutrino Yukawa couplings and results in contributions to the effective number of relativistic species, $N_{\text{eff}}$, testable in upcoming cosmological observations.

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Aqeel Ahmed, Juan P. Garcés, Manfred Lindner. 2025-11-05. Primordial Dirac Leptogenesis. https://arxiv.org/abs/2511.03794

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