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THÈSE Nicolas VASSET

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∂ 2 A<br />

= ∆A,<br />

∂t2 <br />

∂2B C<br />

= ∆B − , 2 2 <br />

∂t 2r<br />

∂2C 2C<br />

= ∆C +<br />

∂t2 r<br />

r2 . <br />

<br />

B C <br />

<br />

<br />

A B C <br />

A(t, r, θ, ϕ) = <br />

ℓ,m<br />

B(t, r, θ, ϕ) = <br />

ℓ,m<br />

C(t, r, θ, ϕ) = <br />

ℓ,m<br />

2 + 8∆θϕB<br />

A ℓm (t, r)Y m<br />

ℓ (θ, ϕ),<br />

B ℓm (t, r)Y m<br />

ℓ (θ, ϕ),<br />

C ℓm (t, r)Y m<br />

ℓ (θ, ϕ).<br />

˜ B Ĉ <br />

˜B(t, r, θ, ϕ) = <br />

<br />

2B<br />

ℓ,m<br />

ℓm (t, r) + Cℓm <br />

(t, r)<br />

Y<br />

2(ℓ + 1)<br />

m<br />

ℓ (θ, ϕ), <br />

Ĉ(t, r, θ, ϕ) = ℓm ℓm m<br />

C (t, r) − 4ℓB (t, r) Yℓ (θ, ϕ). <br />

ℓ,m<br />

<br />

∂2B˜ ∂t2 = ˜ ∆ ˜ B, <br />

∂2Ĉ ∂t2 = ˆ ∆Ĉ; <br />

f(r, θ, ϕ) = <br />

(ℓ,m) f ℓm (r)Y m<br />

ℓ (θ, ϕ) <br />

<br />

˜∆f = ∂2f 2 ∂f<br />

+<br />

∂r2 r ∂r<br />

ˆ∆f = ∂2f 2 ∂f<br />

+<br />

∂r2 r ∂r<br />

1<br />

+<br />

r2 <br />

<br />

+ 1<br />

r 2<br />

ℓm<br />

<br />

ℓm<br />

−ℓ(ℓ − 1)f ℓm Y m<br />

ℓ<br />

<br />

−(ℓ + 1)(ℓ + 2)f ℓm Y m<br />

ℓ<br />

, <br />

<br />

. <br />

<br />

1 ℓ <br />

∆θϕ ˜ ∆ ˆ ∆

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