Self-interacting neutrinos in light of recent CMB and LSS data

2025/03/13 by Adèle Poudou, Théo Simon, Poudou, Adèle +7 · 5 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.2503.10485

openalex publication_date 2025/03/13 · openalex created_date 2025/10/08 · openalex updated_date 2026/07/28

Abstract

We update constraints on a simple model of self-interacting neutrinos involving a heavy scalar mediator with universal flavor coupling. According to past literature, such a model is allowed by Cosmic Microwave Background (CMB) data, with some CMB and large-scale structure data even favoring a strongly-interacting neutrino (SIν) scenario over ΛCDM. In this work, we re-evaluate the constraints on this model in light of the new Planck NPIPE data, DESI BAO data, and the Effective Field Theory of Large Scale Structures (EFTofLSS) applied to BOSS data. We find that Planck NPIPE are more permissive to the SIν scenario and that DESI data favor the SIν over ΛCDM. However, when considering EFTofBOSS data, this mode is no longer preferred. Therefore, new DESI data analyzed under the EFTofLSS are particularly awaited to shed light on this disagreement.

Cited by

• Limits of self-interacting neutrinos from the BAO and CMB phase shift
• Directly Probing Neutrino Interactions through CMB Phase Shift Measurements
• Bias in the tensor-to-scalar ratio from self-interacting dark radiation
• On frequentist confidence intervals in a non-Gaussian regime
• PyBird-JAX: Accelerated inference in large-scale structure with model-independent emulation of one-loop galaxy power spectra

Related

• The magnificent ACT of flavor-specific neutrino self-interaction
• Resonant neutrino self-interactions: Insights from the full shape galaxy power spectrum
• Limits of self-interacting neutrinos from the BAO and CMB phase shift
• The Atacama Cosmology Telescope: The Persistence of Neutrino Self-Interaction in Cosmological Measurements
• Fresh Look at Neutrino Self-Interactions With the Lyman-α Forest: Constraints from EFT and PRIYA Simulations