Bounds from D/H on baryogenesis models

TL;DR

This paper reviews how deuterium abundance measurements constrain baryogenesis models, finding electroweak baryogenesis largely unconstrained while ruling out some exotic scenarios.

Contribution

It provides updated bounds on various baryogenesis models based on deuterium abundance data, highlighting the limited constraints on electroweak baryogenesis.

Findings

Electroweak baryogenesis remains largely unconstrained by current D/H measurements.

Constraints on exotic baryogenesis scenarios are significantly stronger.

Some parameter regions for exotic models are excluded by D/H bounds.

Abstract

We review the constraints on baryon inhomogeneities derived from measurements of the deuterium abundance, $D/H$, and apply them to a range of baryogenesis models. In particular, we derive bounds on electroweak baryogenesis as well as on more exotic scenarios. Our results show that, across most of the relevant parameter space, electroweak baryogenesis remains largely unconstrained by current and foreseeable $D/H$ measurements. By contrast, the constraints on alternative scenarios are significantly stronger and can exclude regions of parameter space that would otherwise remain viable.