| Equilibrium
and Instability conditions |
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| • | Equilibrium
at the |
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| outer
surface |
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| βTκP +κB = |
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| 2κc(1+βg/2‐βk) |
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| • | Instability
condition |
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| βT＞2（lp/R）・ |
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| （ 1+βg/2‐βk
） |
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| • | Growth
time |
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| τ(s) ~100 √(lp9R9/T6) |
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