Primordial nucleosynthesis constraints onZ′properties
نویسندگان
چکیده
منابع مشابه
Primordial Nucleosynthesis Constraints on Z ′ Properties
In models involving new TeV-scale Z ′ gauge bosons, the new U(1) symmetry often prevents the generation of Majorana masses needed for a conventional neutrino seesaw, leading to three superweakly interacting “right-handed” neutrinos νR, the Dirac partners of the ordinary neutrinos. These can be produced prior to big bang nucleosynthesis by the Z ′ interactions, leading to a faster expansion rate...
متن کاملPrimordial Nucleosynthesis
Primordial nucleosynthesis provides a probe of the Universe during its early evolution. Given the progress exploring the constituents, structure, and recent evolution of the Universe, it is timely to review the status of Big Bang Nucleosynthesis (BBN) and to confront its predictions, and the constraints which emerge from them, with those derived from independent observations of the Universe at ...
متن کاملBig bang nucleosynthesis constraints on primordial magnetic fields.
We reanalyze the e ect of magnetic elds in BBN, incorporating several features which were omitted in previous analyses. We nd that the e ects of coherent magnetic elds on the weak interaction rates and the electron thermodynamic functions ( e, Pe, and d e=dT ) are unimportant in comparison to the contribution of the magnetic eld energy density in BBN. In consequence the e ect of including magne...
متن کاملConstraints on Supersymmetric Models from Catalytic Primordial Nucleosynthesis of Beryllium
The catalysis of nuclear reactions by negatively charged relics leads to increased outputs of primordial 6Li and 9Be. In combination with observational constraints on the primordial fractions of 6Li and 9Be, this imposes strong restrictions on the primordial abundance and the lifetime of charged relics. We analyze the constraints from the catalysis of 9Be on supersymmetric models in which the g...
متن کاملPrimordial Nucleosynthesis : Accurate Predictions
Big Bang Nucleosynthesis (BBN) represents a key subject of modern cosmology since it is a powerful tool to study fundamental interactions. In the recent years, the improvement on the measurement accuracy of light primordial nu-clei abundances allowed BBN to enter in a sort of precision era. In view of this, a great theoretical effort has been devoted to make theoretical predictions comparably a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2003
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.67.075009