Cosmic microwave background constraints on secret interactions among sterile neutrinos
Abstract
Secret contact interactions among eV sterile neutrinos, mediated by a massive gauge boson X (with M {sub X}  M {sub W} ), and characterized by a gauge coupling g {sub X} , have been proposed as a mean to reconcile cosmological observations and shortbaseline laboratory anomalies. We constrain this scenario using the latest Planck data on Cosmic Microwave Background anisotropies, and measurements of baryon acoustic oscillations (BAO). We consistently include the effect of secret interactions on cosmological perturbations, namely the increased density and pressure fluctuations in the neutrino fluid, and still find a severe tension between the secret interaction framework and cosmology. In fact, taking into account neutrino scattering via secret interactions, we derive our own mass bound on sterile neutrinos and find (at 95 % CL) m {sub s} < 0.82 eV or m {sub s} < 0.29 eV from Planck alone or in combination with BAO, respectively. These limits confirm the discrepancy with the laboratory anomalies. Moreover, we constrain, in the limit of contact interaction, the effective strength G {sub X} to be < 2.8 (2.0) × 10{sup 10} G {sub F} from Planck (Planck+BAO). This result, together with the mass bound, strongly disfavours the region withmore »
 Authors:

 Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Giuseppe Saragat 1, I44122 Ferrara (Italy)
 Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Via Giuseppe Saragat 1, I44122 Ferrara (Italy)
 Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Univ. Monte S.Angelo, I80126 Napoli (Italy)
 Dipartimento Interateneo di Fisica 'Michelangelo Merlin,' Via Amendola 173, 70126 Bari (Italy)
 PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, JohannesGutenbergUniversität Mainz, 55099 Mainz (Germany)
 Publication Date:
 OSTI Identifier:
 22676089
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2017; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 14757516
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; BARYONS; BOSONS; COSMOLOGY; COUPLING; DENSITY; DISTURBANCES; FLUCTUATIONS; FLUIDS; INTERACTIONS; MASS; MATHEMATICAL SOLUTIONS; MEV RANGE; NONLUMINOUS MATTER; OSCILLATIONS; PERTURBATION THEORY; RELICT RADIATION; SCATTERING; STERILE NEUTRINOS
Citation Formats
Forastieri, Francesco, Natoli, Paolo, Lattanzi, Massimiliano, Mangano, Gianpiero, Mirizzi, Alessandro, and Saviano, Ninetta. Cosmic microwave background constraints on secret interactions among sterile neutrinos. United States: N. p., 2017.
Web. doi:10.1088/14757516/2017/07/038.
Forastieri, Francesco, Natoli, Paolo, Lattanzi, Massimiliano, Mangano, Gianpiero, Mirizzi, Alessandro, & Saviano, Ninetta. Cosmic microwave background constraints on secret interactions among sterile neutrinos. United States. doi:10.1088/14757516/2017/07/038.
Forastieri, Francesco, Natoli, Paolo, Lattanzi, Massimiliano, Mangano, Gianpiero, Mirizzi, Alessandro, and Saviano, Ninetta. Sat .
"Cosmic microwave background constraints on secret interactions among sterile neutrinos". United States. doi:10.1088/14757516/2017/07/038.
@article{osti_22676089,
title = {Cosmic microwave background constraints on secret interactions among sterile neutrinos},
author = {Forastieri, Francesco and Natoli, Paolo and Lattanzi, Massimiliano and Mangano, Gianpiero and Mirizzi, Alessandro and Saviano, Ninetta},
abstractNote = {Secret contact interactions among eV sterile neutrinos, mediated by a massive gauge boson X (with M {sub X}  M {sub W} ), and characterized by a gauge coupling g {sub X} , have been proposed as a mean to reconcile cosmological observations and shortbaseline laboratory anomalies. We constrain this scenario using the latest Planck data on Cosmic Microwave Background anisotropies, and measurements of baryon acoustic oscillations (BAO). We consistently include the effect of secret interactions on cosmological perturbations, namely the increased density and pressure fluctuations in the neutrino fluid, and still find a severe tension between the secret interaction framework and cosmology. In fact, taking into account neutrino scattering via secret interactions, we derive our own mass bound on sterile neutrinos and find (at 95 % CL) m {sub s} < 0.82 eV or m {sub s} < 0.29 eV from Planck alone or in combination with BAO, respectively. These limits confirm the discrepancy with the laboratory anomalies. Moreover, we constrain, in the limit of contact interaction, the effective strength G {sub X} to be < 2.8 (2.0) × 10{sup 10} G {sub F} from Planck (Planck+BAO). This result, together with the mass bound, strongly disfavours the region with M {sub X} ∼ 0.1 MeV and relatively large coupling g {sub X} {sub ∼} 10{sup −1}, previously indicated as a possible solution to the small scale dark matter problem.},
doi = {10.1088/14757516/2017/07/038},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 07,
volume = 2017,
place = {United States},
year = {2017},
month = {7}
}
Works referencing / citing this record:
Constraining light sterile neutrino mass with the BICEP2/Keck array 2014 Bmode polarization data
journal, July 2019
 Roy Choudhury, Shouvik; Choubey, Sandhya
 The European Physical Journal C, Vol. 79, Issue 7