By Dr Julien Lesgourgues, Dr Gianpiero Mangano, Professor Gennaro Miele, Dr Sergio Pastor
ISBN-10: 110701395X
ISBN-13: 9781107013957
The function that neutrinos have performed within the evolution of the Universe is the focal point of 1 of the main interesting study components that has stemmed from the interaction among cosmology, astrophysics and particle physics. during this self-contained ebook, the authors assemble all elements of the position of neutrinos in cosmology, spanning from leptogenesis to primordial nucleosynthesis, their position in CMB and constitution formation, to the matter in their direct detection. The publication starts off by means of guiding the reader via points of basic neutrino physics, equivalent to the normal cosmological version and the statistical mechanics within the increasing Universe, ahead of discussing the heritage of neutrinos in chronological order from the very early phases till this day. This well timed booklet will curiosity graduate scholars and researchers in astrophysics, cosmology and particle physics, who paintings with both a theoretical or experimental concentration
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Extra resources for Neutrino Cosmology
Example text
0082 (LEP, 2006). 2 to 1 eV2 or in a region around 7 eV2 . , 2009). , 2010) and again requiring m2 ∼ 1 eV2 . In a new preliminary data release by the MiniBooNE collaboration, this significance has decreased, but it is still consistent with the LSND signal. In addition, an unexplained excess of electron-like events is observed in MiniBooNE at low energies. , 2012). , 2011). As a result, data from reactor neutrino experiments at very short distances can be interpreted as an apparent 6% deficit of ν¯ e .
Dirac mass A Dirac mass term for neutrinos can be introduced in the SM as for quarks or charged leptons. To this end, it is enough to add three right-handed neutrino fields ναR with α = e, μ, τ which are sterile, in the sense that they are singlet under the whole gauge group and are not interacting with all other particles. c. 48) After spontaneous symmetry breaking, as we discussed for quarks, the mass terms are obtained after the matrices Y l and Y ν are diagonalized through biunitary transformations l† VL Y l VRl = Y l , l Yαβ = yαl δαβ ν† VL Y ν VRν = Y ν , ν Yαβ = yαν δαβ .
On the other hand, if differences among neutrino masses are exceedingly small, energy and momentum resolutions are typically not good enough to distinguish among neutrino mass eigenstates. In this case the outgoing wave packet is a linear superposition of different mass states and the effect of interference (oscillations) can be observed. For the sake of simplicity, in the following we will consider neutrinos as plane waves and will restrict our analysis to the relativistic regime. This is not a significant limitation, because only relativistic neutrinos can usually be detected,2 either via nuclei conversions or using elastic scattering on electrons.
Neutrino Cosmology by Dr Julien Lesgourgues, Dr Gianpiero Mangano, Professor Gennaro Miele, Dr Sergio Pastor
by George
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