Sobolev improving for averages over curves in R4
Sobolev improving for averages over curves in R4
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Sobolev 改进了 R4 曲线的平均值
DOI:
10.1016/j.aim.2021.108089
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发表时间:
2021
影响因子:
1.7
通讯作者:
Seeger, Andreas
中科院分区:
文献类型:
--
作者:
Beltran, David;Guo, Shaoming;Hickman, Jonathan;Seeger, Andreas
We study L p-Sobolev improving for averaging operators A γ given by convolution with a compactly supported smooth density μ γ on a non-degenerate curve. In particular, in 4 dimensions we show that A γ maps L p (R 4) to the Sobolev space L 1/p p (R 4) for all 6< p<∞. This implies the complete optimal range of L p-Sobolev estimates, except possibly for certain endpoint cases. The proof relies on decoupling inequalities for a family of cones which decompose the wave front set of μ γ. In higher dimensions, a new non-trivial necessary condition for L p (R n)→ L 1/p p (R n) boundedness is obtained, which motivates a conjectural range of estimates.
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DOI:
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