Conservative Estimates of the Mass of the Neutrino from Cosmology
نویسندگان
چکیده
mν . In particular we explore the impact of a cosmological parameters, the importance of priors, the uncertainties due to biasing in large scale structure and the dependence on choice of initial conditions. We find that the mass constraints are independent of the choice of parameterization as well as the inclusion of spatial curvature. Yet the difference between an upperbound of 2.2 eV, assuming generic initial conditions, and an upper bound of 0.63 eV, assuming adiabaticity and b = 1, demonstrate the dependence of such a constraint on the assumptions in the analysis.
منابع مشابه
Low-scale standard supersymmetric leptogenesis
Strictly adhering to the standard supersymmetric seesaw mechanism, we present a neutrino mass model which allows successful standard thermal leptogenesis compatible with gravitino cosmology. Some neutrino Yukawa couplings are naturally much larger than the näıve estimates following from the seesaw formula. This leads to large BR(μ → eγ), detectable in the next round of experiments. Ratios of μ ...
متن کاملNeutrino mass bounds from cosmology
Neutrinos are the among the most abundant particles in the universe. This means that they have a profound impact on many different aspects of cosmology, from the question of leptogenesis in the very early universe, over big bang nucleosynthesis, to late time structure formation. At late times (T ∼<TEW) neutrinos mainly influence cosmology because of their energy density and, even later, their m...
متن کاملNeutrinos in Cosmology
The current status of neutrino cosmology is reviewed, from the question of neutrino decoupling and the presence of sterile neutrinos to the effects of neutrinos on the cosmic microwave background and large scale structure. Particular emphasis is put on cosmological neutrino mass measurements. Neutrinos in Cosmology 2
متن کاملImproved Limit on θ13 and Implications for Neutrino Masses in Neutrino-less Double Beta Decay and Cosmology
We analyze the impact of a measurement, or of an improved bound, on θ13 for the determination of the effective neutrino mass in neutrino-less double beta decay and cosmology. In particular, we discuss how an improved limit on (or a specific value of) θ13 can influence the determination of the neutrino mass spectrum via neutrinoless double beta decay. We also discuss the interplay with improved ...
متن کاملGoldstino Decoupling in Spontaneously Broken Supergravity Theories
If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial 4He abundance. Assuming a conservative estimate that the number of neutrino families, Nν < 3.6, superlight gr...
متن کامل