On the critical dimension of a fourth order elliptic problem with negative exponent
On the critical dimension of a fourth order elliptic problem with negative exponent
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DOI:
10.1016/j.jde.2009.09.011
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发表时间:
2009-05
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影响因子:
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通讯作者:
Amir Moradifam
中科院分区:
文献类型:
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作者:
Amir Moradifam
We study the regularity of the extremal solution of the semilinear biharmonic equation βΔ2u−τΔu=λ(1−u)2on a ball B⊂RN, under Navier boundary conditions u=Δu=0 on ∂B, where λ>0 is a parameter, while τ>0, β>0 are fixed constants. It is known that there exists λ∗such that for λ>λ∗there is no solution while for λ<λ∗there is a branch of minimal solutions. Our main result asserts that the extremal solution u∗is regular (supBu∗<1) for N⩽8 and β,τ>0 and it is singular (supBu∗=1) for N⩾9, β>0, and τ>0 with τβ small. Our proof for the singularity of extremal solutions in dimensions N⩾9 is based on certain improved Hardy–Rellich inequalities.