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arXiv · 2604.26860

Nanohertz gravitational waves from the baryon-dark matter coincidence

Alessia Musumeci·Jacopo Nava·Silvia Pascoli·Filippo Sala
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Abstract

The nanohertz gravitational waves (GW) observed by pulsar timing arrays may originate from a cosmological first-order phase transition (PT) at $\sim$ 100 MeV. Taking this possibility seriously motivates the question: why 100 MeV? We point out that a PT at exactly those scales is predicted by the generation of the baryon asymmetry from a dark asymmetry via resonant neutron-dark matter oscillations, and we prove that this PT can induce an observable GW signal compatibly with all experimental constraints. This proposal predicts dark matter self-interactions close to their observational upper limits and lowers the maximal expected mass of neutron stars. Independently of GW, this baryogenesis mechanism is tested by searches for missing-energy at the LHC and for neutron decays. We keep the model consistent with big-bang nucleosynthesis by adding heavy neutral leptons below 100 MeV, which generate neutrino masses and can induce further experimental tests.

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Alessia Musumeci, Jacopo Nava, Silvia Pascoli, Filippo Sala. 2026-04-29. Nanohertz gravitational waves from the baryon-dark matter coincidence. https://arxiv.org/abs/2604.26860

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