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THÈSE Nicolas VASSET

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F <br />

S r = rS <br />

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1 ∂F<br />

N ∂t = µ(∆θϕF − ∆θϕF∞) − α(F − F∞). <br />

µ α <br />

F∞ <br />

F <br />

S N = N0 ∈ R + <br />

∞ ℓ<br />

F0 =<br />

F0ℓmY m<br />

ℓ (θ, ϕ). t = t0 <br />

ℓ=0 m=−ℓ<br />

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∀(t ≥ t0), ∀(ℓ, m), Fℓm(t) = F∞ℓm + (F0ℓm − F∞ℓm)e −N(α+µℓ(ℓ+1))(t−t0) . <br />

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α µ

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