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Neutrinoless universe.

John F Beacom1, Nicole F Bell, Scott Dodelson

  • 1NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510-0500, USA.

Physical Review Letters
|September 28, 2004
PubMed
Summary
This summary is machine-generated.

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New neutrino interactions could cause relic neutrinos to annihilate into bosons. This annihilation would make their contribution to the universe's matter density negligible, bypassing neutrino mass limits.

Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • The relic neutrino abundance is a key cosmological parameter.
  • Current models assume standard neutrino interactions.
  • Neutrino mass limits from large-scale structure are stringent.

Purpose of the Study:

  • To investigate the impact of additional neutrino interactions on relic neutrino abundance.
  • To explore scenarios involving couplings of neutrinos to light bosons.
  • To determine if these interactions can reconcile relic neutrinos with cosmological observations.

Main Methods:

  • Theoretical modeling of neutrino interactions.
  • Analysis of relic neutrino annihilation processes.
  • Comparison with existing cosmological and astrophysical constraints.

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Main Results:

  • Extra neutrino interactions, specifically coupling to light bosons, can lead to late-time annihilation.
  • For a range of couplings, relic neutrinos annihilate into bosons.
  • This annihilation significantly reduces the relic neutrino contribution to matter density.

Conclusions:

  • The proposed mechanism provides a way for relic neutrinos to have a negligible impact on matter density.
  • This evades the strict neutrino mass limits derived from large-scale structure observations.
  • Further research into non-standard neutrino interactions is warranted.