Electroweak Baryogenesis and Constraints on Left-handed Majorana Neutrino Masses
نویسنده
چکیده
The lepton number violating interactions generated by the light Majorana neutrinos can erase the primordial baryon asymmetry of the universe during the electroweak phase transition. The Majorana masses of the left-handed neutrinos are constrained to avoid this problem. These constraints do not depend on the (B−L) symmetry breaking mechanism. 1 e-mail address : [email protected]
منابع مشابه
Electroweak Baryon Number Violation and Constraints on Left-handed Majorana Neutrino Masses
During a large period of time, the anomalous baryon number violating interactions are in equilibrium, when the (B+L) asymmetry is washed out. If there is any lepton number violation during this period, that will also erase the (B −L) asymmetry. As a result, survival of the baryon asymmetry of the universe pose strong constraints on lepton number violating interactions. We review here the constr...
متن کاملBaryogenesis through lepton number violation
The most promising scenarios of baryogenesis seems to be the one through lepton number violation. Lepton number violation through a Majarana mass of the right-handed neutrinos can generate a lepton asymmetry of the universe when the righthanded neutrinos decay. The left-handed neutrinos get small Majorana masses through see-saw mechanism in these models. A triplet higgs scalar violating lepton ...
متن کاملNeutrino masses and Baryogenesis via Leptogenesis in the Exceptional Supersymmetric Standard Model
Netrino oscillation experiments discover that (left-handed) neutrinos have masses much less than charged leptons and quarks in the Standard Model. One solution to the light neutrino mass puzzle is the seesaw model where right-handed neutrinos are introduced with large Majorana masses. The heavy Majorana right-handed neutrinos lead to lepton number violation in the early universe. They decay int...
متن کاملGravitino constraints on models of neutrino masses and leptogenesis
In the supersymmetric extensions of the standard model, neutrino masses and leptogenesis requires existence of new particles. We point out that if these particles with lepton number violating interactions have standard model gauge interactions, then they may not be created after reheating because of the gravitino problem. This will rule out all existing models of neutrino masses and leptogenesi...
متن کاملConformal Neutrinos: an Alternative to the See-saw Mechanism
We analyze a scenario where the right-handed neutrinos make part of a strongly coupled conformal field theory and acquire an anomalous dimension γ < 1 at a large scale Λ. Their Yukawa couplings to the Higgs become irrelevant at the fixed point and they are suppressed at low scales giving rise naturally to a small (sub-meV) Dirac neutrino mass which breaks the conformal invariance. We derive an ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996