Work

Dark walker in the early universe: A strongly coupled sector model

Year: 2025

Type: article

Abstract: We explore the phenomenology of the “Dark Walker”—an SU(3) theory with eight flavors of massless fundamental fermions in the dark sector. During inflation, its walking dynamics generate primordial non-Gaussianities through the exchange of unparticles, while accounting for the current dark matter relic abundance if we consider freeze-in of Dark Walker coupled to the Standard Model through the Higgs portal. This provides a simple yet predictive example linking strongly coupled inflationary dynamics to present-day dark matter.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2025.140073

Author: Chen Yang

Institution: Scuola Normale Superiore

Language: English

Topic: Dark Matter and Cosmic Phenomena

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: European Research Council, Instituto Nazionale di Fisica Nucleare

Award: G343086344