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arXiv 1606.01064math.FAmath.CA
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具有Gauss界的半群的Hardy空间

Hardy spaces for semigroups with Gaussian bounds

Jacek Dziubański, Marcin Preisner

摘要:

设T_t=e^{-tL}是作用在L^2(X,mu)上的自伴线性算子半群,其中(X,d mu)是齐型空间.我们假设T_t有一个积分核T_t(x,y),它满足高斯上、下界:\frac{C_1}{mu(B(x,\sqrt{t}))} \exp(-c_1 d(x,y)^2/t)\leq T_t(x,y)\leq \frac{C_2}{μ(B(x,\sqrt{t}))} \exp(-c_2 d(x,y)^2/t)。根据定义,如果f {H^1_L}= \sup_{t>0},则f属于H^1_L| T_t f(x)|\|_{L^1(X,μ)} < \infty .证明了存在一个函数ω(x),0<cPDMATHABMO ω(x)\leq C,使得H^1_L允许一个原子分解,其原子满足:supp a \subset B,\|a\|_{L^ \infty } \leq mu(B)^{-1}和加权消去条件\int a(x)ω(x)dmu(x)=0.

英文摘要:

Let T_t=e^{-tL} be a semigroup of self-adjoint linear operators acting on L^2(X,mu), where (X,d mu) is a space of homogeneous type. We assume that T_t has an integral kernel T_t(x,y) which satisfies the upper and lower Gaussian bounds: \frac{C_1}{mu(B(x,\sqrt{t}))} \exp(-c_1d(x,y)^2/t)\leq T_t(x,y) \leq \frac{C_2}{μ(B(x,\sqrt{t}))} \exp(-c_2 d(x,y)^2/t). By definition, f belongs to H^1_L if \| f\|_{H^1_L}=\|\sup_{t>0}|T_t f(x)|\|_{L^1(X,μ)} <\infty. We prove that there is a function ω(x), 0<c \leq ω(x) \leq C, such that H^1_L admits an atomic decomposition with atoms satisfying: supp a \subset B, \|a\|_{L^\infty} \leq mu(B)^{-1}, and the weighted cancellation condition \int a(x)ω(x) dmu(x)=0.

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