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
中科院分区:
文献类型:
--
作者:
Hart F. Smith;C. Sogge
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+