Cosmological models based on variants
of the standard CDM scenario have been proposed by many authors. In my
PhD thesis  I have studied the
linear spectra evolution of a CDM
model with a massive neutrino component(CHDM). For several years CHDM models
have been considered to provide a good fit to clustering data, but the
recent strong observational evidence for a non-zero cosmological constant
has ruled out these models. The Kamiokande experiment showed that neutrinos
have a non-zero rest mass, so it has been studied the possible influence
on the primeval spectrum P(k) of a CDM cosmology , dominated by
a term ( CDM
models), of a small neutrino mass m.
The main points are :
This line of research is currently
in stand-by... Possible developments : T
/T , clustering evolution, numerical simulations.
Linear density evolution has been considered
for the formation of large scale structures in flat cosmologies with
very popular) and m>0
demanded by Kamiokande)
The results show that the shape
of the final spectra is governed by the ratio /M
even neutrinos with 0.01 < m
< 0.1 can induce strong changes
in the final P(k)
Linear analysis shows that consistency
with clustering data is obtained for h=0.7, M~
0.4 and 0.05 < /M
0.1 ( m ~ 0.1 -1
Other research subjects investigated
in the linear regime have been the small-scale anisotropies of the cosmic
background radiation [2,5]and its polarization .
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