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A restriction theorem for oscillatory integral operator with certain polynomial phase 被引量:1
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作者 shaozhen xu Dunyan YAN 《Frontiers of Mathematics in China》 SCIE CSCD 2017年第4期967-980,共14页
We consider the oscillatory integral operator Ta,mf(X) f(y)dy, where the function f is a Schwartz function.In this paper, the restriction theorem on Sn-1 for this operator is obtained. Moreover, we obtain a necess... We consider the oscillatory integral operator Ta,mf(X) f(y)dy, where the function f is a Schwartz function.In this paper, the restriction theorem on Sn-1 for this operator is obtained. Moreover, we obtain a necessary condition which ensures validity of the restriction theorem. 展开更多
关键词 Restriction theorem oscillatory integral operator L2 boundedness optimal estimate necessary condition
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Sharp L^p decay of oscillatory integral operators with certain homogeneous polynomial phases in several variables
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作者 shaozhen xu Dunyan Yan 《Science China Mathematics》 SCIE CSCD 2019年第4期649-662,共14页
In this paper, we obtain the L^p decay of oscillatory integral operators T_λ with certain homogeneous polynomial phase functions of degree d in(n + n)-dimensions; we require that d > 2 n. If d/(d-n) < p < d/... In this paper, we obtain the L^p decay of oscillatory integral operators T_λ with certain homogeneous polynomial phase functions of degree d in(n + n)-dimensions; we require that d > 2 n. If d/(d-n) < p < d/n,the decay is sharp and the decay rate is related to the Newton distance. For p = d/n or d/(d-n), we obtain the almost sharp decay, where "almost" means that the decay contains a log(λ) term. For otherwise, the L^p decay of T_λ is also obtained but not sharp. Finally, we provide a counterexample to show that d/(d-n) p d/n is not necessary to guarantee the sharp decay. 展开更多
关键词 OSCILLATORY integral operators SHARP L^p DECAY several variables NEWTON distance
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