The B−L Phase Transition

Implications for Cosmology and Neutrinos

  • Kai Schmitz

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xiii
  2. Kai Schmitz
    Pages 1-10
  3. Kai Schmitz
    Pages 11-37
  4. Kai Schmitz
    Pages 39-76
  5. Kai Schmitz
    Pages 77-88
  6. Kai Schmitz
    Pages 89-116
  7. Kai Schmitz
    Pages 117-128
  8. Kai Schmitz
    Pages 129-181
  9. Kai Schmitz
    Pages 193-197
  10. Back Matter
    Pages 199-221

About this book


Several of the very foundations of the cosmological standard model — the baryon asymmetry of the universe, dark matter, and the origin of the hot big bang itself — still call for an explanation from the perspective of fundamental physics. This work advocates one intriguing possibility for a consistent cosmology that fills in the theoretical gaps while being fully in accordance with the observational data. At very high energies, the universe might have been in a false vacuum state that preserved B-L, the difference between the baryon number B and the lepton number L as a local symmetry. In this state, the universe experienced a stage of hybrid inflation that only ended when the false vacuum became unstable and decayed, in the course of a waterfall transition, into a phase with spontaneously broken B-L symmetry. This B-L Phase Transition was accompanied by tachyonic preheating that transferred almost the entire energy of the false vacuum into a gas of B-L Higgs bosons, which in turn decayed into heavy Majorana neutrinos.
Eventually, these neutrinos decayed into massless radiation, thereby producing the entropy of the hot big bang, generating the baryon asymmetry of the universe via the leptogenesis mechanism and setting the stage for the production of dark matter. Next to a variety of conceptual novelties and phenomenological predictions, the main achievement of the thesis is hence the fascinating notion that the leading role in the first act of our universe might have actually been played by neutrinos.


Boltzmann Equations Cosmological Phase Transition False Vacuum Decay Gravitino / WIMP Dark Matter Hybrid Inflation Reheating through Heavy Neutrino Decays Spontaneous B−L Breaking Supersymmetric Abelian Higgs Model Tachyonic Preheating Thermal and Nonthermal Leptogenesis

Authors and affiliations

  • Kai Schmitz
    • 1
  1. 1.Kavli IPMUUniversity of TokyoKashiwaJapan

Bibliographic information

  • DOI
  • Copyright Information Springer International Publishing Switzerland 2014
  • Publisher Name Springer, Cham
  • eBook Packages Physics and Astronomy
  • Print ISBN 978-3-319-00962-9
  • Online ISBN 978-3-319-00963-6
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
  • About this book