Gapped Unparticles in Inflation
Published:Dec 29, 2025 19:00
•1 min read
•ArXiv
Analysis
This paper explores a novel scenario for a strongly coupled spectator sector during inflation, introducing "gapped unparticles." It investigates the phenomenology of these particles, which combine properties of particles and unparticles, and how they affect primordial density perturbations. The paper's significance lies in its exploration of new physics beyond the standard model and its potential to generate observable signatures in the cosmic microwave background.
Key Takeaways
- •Introduces "gapped unparticles" as a new model for a strongly coupled spectator sector during inflation.
- •Derives two-point and four-point correlation functions for gapped unparticles.
- •Predicts novel features in the correlation functions of primordial density perturbations, such as oscillations controlled by the anomalous dimension.
- •Provides a strategy to distinguish gapped unparticles from heavy massive scalars.
- •Explores the interference pattern produced by gapped unparticles with different effective masses if interactions are localized on a brane.
Reference
“The phenomenology of the resulting correlators presents some novel features, such as oscillations with an envelope controlled by the anomalous dimension, rather than the usual value of 3/2.”