MAPPE DEL FONDO COSMICO A MICROONDE

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MAPPE DEL FONDO COSMICO A MICROONDE

BH = (mp + me − mH)c 2


nH

npn e −


h


2

2πmekBT

3

2

e B/(kBT )


X = ne/nb = np/nb X = X(T )

T = Tγ


X =

1 + 4f(T ) − 1

2f(T )

2 h (T/T0)

f(T ) = nγ0η

2πmekBT0

3

2

e B/(kBT )



T0 (∼ 2.725 K) nγ0 ∼ 411 cm −3

η (η ∼ 5 × 10 −10 )




η Trec 3000 K

zrec + 1 = Trec

= 1100

T0


∼ 4000 K ∼ 3000 K


< z >= zrec 1100

t = trec dH(t) := c

H(t)

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