On Strichartz and eigenfunction estimates for low regularity metrics

On Strichartz and eigenfunction estimates for low regularity metrics
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关于低规律性度量的 Strichartz 和特征函数估计

DOI:
10.4310/mrl.1994.v1.n6.a9
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发表时间:
1994
影响因子:
1
通讯作者:
C. Sogge
C. Sogge
中科院分区:
数学3区
文献类型:
--
作者:
Hart F. Smith;C. Sogge

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抽象的。我们给出了n ≥ 3维的波算子的例子,这些例子包括Lipschitz和C1,α度量,其中0 <α< 1,我们表示在梯度上满足α阶H?lder条件。因此,我们得出结论,在H?old正则性尺度上,对于n ≥ 2维的Lipschitz或C1,α系数的二阶Lipschitz算子,本文的构造也给出了C ∞系数算子的某些特征函数估计不成立的结论。1.在这里,我们称之为R 1+ n上的广义本文证明了如下情形(见[St1,2]):若u解系统方程u = F ∈ L2(n +1)n +3(R1 + n),u(0,·)= f∈ H12(Rn),u(0,·)= g∈ H − 12(Rn),则下列估计成立(1.1)uL2(n +1)n− 1(R1 + n
Abstract. Weproduce,fordimensions n ≥ 3,examplesofwaveoperatorsforwhichtheStrichartzestimatesfail.TheexamplesincludebothLipschitzand C 1 ,α metrics,foreach0 <α< 1,wherebythelatterwemeanthatthe gradient satisfies a H¨older condition of order α . We thus concludethat,onthescaleofH¨olderregularity,anassumptionofatleast2boundedderivativesforthemetric(i.e., C 1 , )isnecessaryinordertoassurethattheStrichartzestimateshold.Thesameconstructionalsoyields,fordimensions n ≥ 2, secondorderellipticoperatorswithLipschitzor C 1 ,α coefficientsforwhichcertaineigenfunctionestimates,establishedbythesecondauthorforoperatorswith C ∞ coefficients,failtohold. 1. StrichartzEstimatesWerecallheretheglobalversionoftheStrichartzestimatesonR 1+ n ,fortheEuclideanwaveoperator 2= ∂ t − nj =1 ∂ 2 j . Thesestate(see[St1,2])that,if u solvesthesystemofequations u = F ∈ L 2( n +1) n +3 (R 1+ n ) ,u (0 ,· )= f∈ H 12 (R n ) ,∂ t u (0 ,· )= g∈ H − 12 (R n ) , thenthefollowingestimateholds(1.1) u L 2( n +1) n− 1 (R 1+