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Tomas
Tomas
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Consider the operator $T_\lambda=\int_{\mathbb{R}^3}{\frac{\sin\lambda|x-y|}{|x-y|}f(y) dy}$$T_\lambda f(x)= \int_{\mathbb{R}^3}{\frac{\sin\lambda|x-y|}{|x-y|}\phi(x-y) f(y) dy}$, where $\phi\in C_0^{\infty}$, $\phi(x)=1$, when $|x|<1$ . My question is that do we have the following estimate $$ \|T_{\lambda}f T_{\mu}g\|_{L^2(\mathbb{R}^3)}\leq \frac{C}{\lambda^{\frac{1}{2}}\mu^{\frac{3}{2}}}\|f\|_{L^2(\mathbb{R}^3)}\|g\|_{L^2(\mathbb{R}^3)},\quad 1\leq \lambda\leq \mu $$ I want the deacy for "high frequency" (i.e. $\mu$ here) go faster than the "low frequency"(i.e. $\lambda$ here). Are there any references which discuss such type of bilinear oscillatory integrals?

Thanks.

Consider the operator $T_\lambda=\int_{\mathbb{R}^3}{\frac{\sin\lambda|x-y|}{|x-y|}f(y) dy}$. My question is that do we have the following estimate $$ \|T_{\lambda}f T_{\mu}g\|_{L^2(\mathbb{R}^3)}\leq \frac{C}{\lambda^{\frac{1}{2}}\mu^{\frac{3}{2}}}\|f\|_{L^2(\mathbb{R}^3)}\|g\|_{L^2(\mathbb{R}^3)},\quad 1\leq \lambda\leq \mu $$ I want the deacy for "high frequency" (i.e. $\mu$ here) go faster than the "low frequency"(i.e. $\lambda$ here). Are there any references which discuss such type of bilinear oscillatory integrals?

Thanks.

Consider the operator $T_\lambda f(x)= \int_{\mathbb{R}^3}{\frac{\sin\lambda|x-y|}{|x-y|}\phi(x-y) f(y) dy}$, where $\phi\in C_0^{\infty}$, $\phi(x)=1$, when $|x|<1$ . My question is that do we have the following estimate $$ \|T_{\lambda}f T_{\mu}g\|_{L^2(\mathbb{R}^3)}\leq \frac{C}{\lambda^{\frac{1}{2}}\mu^{\frac{3}{2}}}\|f\|_{L^2(\mathbb{R}^3)}\|g\|_{L^2(\mathbb{R}^3)},\quad 1\leq \lambda\leq \mu $$ I want the deacy for "high frequency" (i.e. $\mu$ here) go faster than the "low frequency"(i.e. $\lambda$ here). Are there any references which discuss such type of bilinear oscillatory integrals?

Thanks.

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Tomas
Tomas
  • 879
  • 1
  • 7
  • 12

Estimates of a bilinear oscillatory integral

Consider the operator $T_\lambda=\int_{\mathbb{R}^3}{\frac{\sin\lambda|x-y|}{|x-y|}f(y) dy}$. My question is that do we have the following estimate $$ \|T_{\lambda}f T_{\mu}g\|_{L^2(\mathbb{R}^3)}\leq \frac{C}{\lambda^{\frac{1}{2}}\mu^{\frac{3}{2}}}\|f\|_{L^2(\mathbb{R}^3)}\|g\|_{L^2(\mathbb{R}^3)},\quad 1\leq \lambda\leq \mu $$ I want the deacy for "high frequency" (i.e. $\mu$ here) go faster than the "low frequency"(i.e. $\lambda$ here). Are there any references which discuss such type of bilinear oscillatory integrals?

Thanks.