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Title: Sterile neutrinos with secret interactions — lasting friendship with cosmology

Sterile neutrinos with mass ≃1 eV and order 10% mixing with active neutrinos have been proposed as a solution to anomalies in neutrino oscillation data, but are tightly constrained by cosmological limits. It was recently shown that these constraints are avoided if sterile neutrinos couple to a new MeV-scale gauge boson A{sup ′}. However, even this scenario is restricted by structure formation constraints when A{sup ′}-mediated collisional processes lead to efficient active-to-sterile neutrino conversion after neutrinos have decoupled. In view of this, we reevaluate in this paper the viability of sterile neutrinos with such “secret” interactions. We carefully dissect their evolution in the early Universe, including the various production channels and the expected modifications to large scale structure formation. We argue that there are two regions in parameter space — one at very small A{sup ′} coupling, one at relatively large A{sup ′} coupling — where all constraints from big bang nucleosynthesis (BBN), cosmic microwave background (CMB), and large scale structure (LSS) data are satisfied. Interestingly, the large A{sup ′} coupling region is precisely the region that was previously shown to have potentially important consequences for the small scale structure of dark matter halos if the A{sup ′} boson couplesmore » also to the dark matter in the Universe.« less
Authors:
 [1] ;  [2] ;  [3]
  1. International Center for Theoretical Physics,Strada Costiera 11, Trieste, 34014 (Italy)
  2. Tata Institute of Fundamental Research,Homi Bhabha Road, Mumbai, 400005 (India)
  3. PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics,Johannes Gutenberg University, Staudingerweg 7, Mainz, 55128 (Germany)
Publication Date:
OSTI Identifier:
22458387
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 10; Other Information: PUBLISHER-ID: JCAP10(2015)011; OAI: oai:repo.scoap3.org:12142; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Sponsoring Org:
SCOAP3, CERN, Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOSONS; COSMOLOGY; GALACTIC EVOLUTION; GAUGE INVARIANCE; LIMITING VALUES; MASS; MATHEMATICAL SOLUTIONS; MATHEMATICAL SPACE; MEV RANGE; NEUTRINO OSCILLATION; NEUTRINOS; NONLUMINOUS MATTER; NUCLEOSYNTHESIS; RELICT RADIATION; UNIVERSE