Davies’ method for heat-kernel estimates: An extension to the semi-elliptic setting
Davies’ method for heat-kernel estimates: An extension to the semi-elliptic setting
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用于热核估计的 Davies 方法:半椭圆设置的扩展
DOI:
10.1090/tran/8050
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发表时间:
2020
影响因子:
1.3
通讯作者:
Saloff-Coste, Laurent
中科院分区:
文献类型:
--
作者:
Randles, Evan;Saloff-Coste, Laurent
We consider a class of constant-coefficient partial differential operators on a finite-dimensional real vector space which exhibit a natural dilation invariance. Typically, these operators are anisotropic, allowing for different degrees in different directions. The “heat” kernels associated to these so-called positive-homogeneous operators are seen to arise naturally as the limits of convolution powers of complex-valued measures, just as the classical heat kernel appears in the central limit theorem. Building on the functional-analytic approach developed by EB Davies for higher-order uniformly elliptic operators with measurable coefficients, we formulate a general theory for (anisotropic) self-adjoint variable-coefficient operators, each comparable to a positive-homogeneous operator, and study their associated heat kernels. Specifically, under three abstract hypotheses, we show that the heat kernels satisfy off-diagonal (Gaussian-type) estimates involving the Legendre-Fenchel transform of the operator’s principle symbol. Our results extend those of EB Davies and G. Barbatis and partially extend results of AFM ter Elst and D. Robinson. References
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DOI:
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发表时间:
2015
期刊:
影响因子:
--
作者:
Evan Randles;L. Saloff‐Coste;V. Thomée;M. V. Fedoryuk
通讯作者:
M. V. Fedoryuk
DOI:
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1969
期刊:
影响因子:
--
作者:
Y. Kannai
通讯作者:
Y. Kannai
DOI:
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1993
期刊:
影响因子:
--
作者:
G. Demidenko
通讯作者:
G. Demidenko
DOI:
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发表时间:
1957
影响因子:
11.1
作者:
F. Browder
通讯作者:
F. Browder
DOI:
10.1142/e025
发表时间:
2010-03
期刊:
--
影响因子:
--
作者:
小谷 元子;M. Hino;熊谷 隆;日本数学会
通讯作者:
小谷 元子;M. Hino;熊谷 隆;日本数学会