http://arxiv.org/abs/2207.00465
In this work we make the observation that the gravitational leptogenesis mechanism can be implemented without invoking new axial couplings in the inflaton sector. We show that in the perturbed Robertson-Walker background emerging after inflation, the spacetime metric itself breaks parity symmetry and generates a non-vansihing Pontryagin density which can produce a matter-antimatter asymmetry. We analyze the inflationary and reheating scenarios in which the produced asymmetry could be compatible with observations.
A. Maroto and A. Miravet
Mon, 4 Jul 22
44/62
Comments: 5 pages, 3 figures
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