Positive curvature property for some hypoelliptic heat kernels
Positive curvature property for some hypoelliptic heat kernels
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某些亚椭圆热核的正曲率性质
DOI:
10.1016/j.bulsci.2010.08.001
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发表时间:
2010-06
期刊:
影响因子:
--
通讯作者:
Bin Qian
中科院分区:
文献类型:
--
作者:
Bin Qian
In this note, we look at some hypoelliptic operators arising from nilpotent rank 2 Lie algebras. In particular, we concentrate on the diffusion generated by three Brownian motions and their three Lévy areas, which is the simplest extension of the Laplacian on the Heisenberg group H. In order to study contraction properties of the heat kernel, we show that, as in the case of the Heisenberg group, the restriction of the sub-Laplace operator acting on radial functions (which are defined in some precise way in the core of the paper) satisfies a non-negative Ricci curvature condition (more precisely a CD(0,∞) inequality), whereas the operator itself does not satisfy any CD(r,∞) inequality. From this we may deduce some useful, sharp gradient bounds for the associated heat kernel.
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影响因子:
0.8
作者:
Fabrice Baudoin;M. Bonnefont
通讯作者:
Fabrice Baudoin;M. Bonnefont
影响因子:
1.7
作者:
Hong-Quan Li
通讯作者:
Hong-Quan Li
DOI:
--
发表时间:
2008-06
期刊:
arXiv: Analysis of PDEs
影响因子:
--
作者:
D. Bakry;Fabrice Baudoin;M. Bonnefont;B. Qian
通讯作者:
D. Bakry;Fabrice Baudoin;M. Bonnefont;B. Qian
影响因子:
3.7
作者:
NAGEL, A;STEIN, EM;WAINGER, S
通讯作者:
WAINGER, S
影响因子:
3.7
作者:
B. Gaveau
通讯作者:
B. Gaveau