skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Neutrinos secretly converting to lighter particles to please both KATRIN and the cosmos

Abstract

Within the framework of the Standard Model of particle physics and standard cosmology, observations of the Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAO) set stringent bounds on the sum of the masses of neutrinos. If these bounds are satisfied, the upcoming KATRIN experiment which is designed to probe neutrino mass down to ∼ 0.2 eV will observe only a null signal. We show that the bounds can be relaxed by introducing new interactions for the massive active neutrinos, making neutrino masses in the range observable by KATRIN compatible with cosmological bounds. Within this scenario, neutrinos convert to new stable light particles by resonant production of intermediate states around a temperature of T∼ keV in the early Universe, leading to a much less pronounced suppression of density fluctuations compared to the standard model.

Authors:
 [1];  [2]
  1. School of physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of)
  2. Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C (Denmark)
Publication Date:
OSTI Identifier:
22524978
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COMPARATIVE EVALUATIONS; COSMOLOGY; DENSITY; EV RANGE; FLUCTUATIONS; INTERMEDIATE STATE; KEV RANGE; MASS; NEUTRINOS; OSCILLATIONS; RELICT RADIATION; STANDARD MODEL; UNIVERSE; VISIBLE RADIATION

Citation Formats

Farzan, Yasaman, and Hannestad, Steen, E-mail: yasaman@theory.ipm.ac.ir, E-mail: sth@phys.au.dk. Neutrinos secretly converting to lighter particles to please both KATRIN and the cosmos. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/02/058.
Farzan, Yasaman, & Hannestad, Steen, E-mail: yasaman@theory.ipm.ac.ir, E-mail: sth@phys.au.dk. Neutrinos secretly converting to lighter particles to please both KATRIN and the cosmos. United States. doi:10.1088/1475-7516/2016/02/058.
Farzan, Yasaman, and Hannestad, Steen, E-mail: yasaman@theory.ipm.ac.ir, E-mail: sth@phys.au.dk. Mon . "Neutrinos secretly converting to lighter particles to please both KATRIN and the cosmos". United States. doi:10.1088/1475-7516/2016/02/058.
@article{osti_22524978,
title = {Neutrinos secretly converting to lighter particles to please both KATRIN and the cosmos},
author = {Farzan, Yasaman and Hannestad, Steen, E-mail: yasaman@theory.ipm.ac.ir, E-mail: sth@phys.au.dk},
abstractNote = {Within the framework of the Standard Model of particle physics and standard cosmology, observations of the Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAO) set stringent bounds on the sum of the masses of neutrinos. If these bounds are satisfied, the upcoming KATRIN experiment which is designed to probe neutrino mass down to ∼ 0.2 eV will observe only a null signal. We show that the bounds can be relaxed by introducing new interactions for the massive active neutrinos, making neutrino masses in the range observable by KATRIN compatible with cosmological bounds. Within this scenario, neutrinos convert to new stable light particles by resonant production of intermediate states around a temperature of T∼ keV in the early Universe, leading to a much less pronounced suppression of density fluctuations compared to the standard model.},
doi = {10.1088/1475-7516/2016/02/058},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 02,
volume = 2016,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 2016},
month = {Mon Feb 01 00:00:00 EST 2016}
}