Evoluzione perturbazioni
nel modello standard del
Big Bang
Lezioni 14-15
example, if Ω0 = 1, the increase is a factor of 103 , as expected from (11.37). In the
case Ω0 = 0.1, the amplitudes of the fluctuations grow as ∆ ∝ a over the range of
Crescita perturbazioni da z=1000
Fig. 11.4. The growth of density perturbations over the range of scale factors a = 10−3 to 1
A. Marconi
Cosmologia (2012/2013)
2
Crescita perturbazioni da z=30
Ω0 H02
Ω0 H02
c2
2 2
ȧ =
+ ΩΛ a H0 − 2 =
+ ΩΛ a2 H02 − κc2 .
a
#
a
2
(11.57)
Δ=10-3 per a=10-3
perturbations
over the range of scale factors a = 1/30 to 1
A. MarconiFig. 11.5. The growth of density
Cosmologia
(2012/2013)
3
Crescita
vel. peculiari da z=1000
330
11 The Evolution of Perturbations in the Standard Big Bang
~(a Ω0)1/2
A. Marconi
Cosmologia (2012/2013)
4
Crescita vel. peculiari da z=1000
~(a Ω0)1/2
A.
Marconi
Cosmologia
(2012/2013)
Fig.
11.6a,b. The growth of the peculiar
velocities
over the range of scale factors a = 10−3 5