共查询到20条相似文献,搜索用时 15 毫秒
1.
We introduce a class of non-commutative Heisenberg-like infinite-dimensional Lie groups based on an abstract Wiener space. The Ricci curvature tensor for these groups is computed and shown to be bounded. Brownian motion and the corresponding heat kernel measures, {νt}t>0, are also studied. We show that these heat kernel measures admit: (1) Gaussian like upper bounds, (2) Cameron-Martin type quasi-invariance results, (3) good Lp-bounds on the corresponding Radon-Nikodym derivatives, (4) integration by parts formulas, and (5) logarithmic Sobolev inequalities. The last three results heavily rely on the boundedness of the Ricci tensor. 相似文献
2.
Karl-Hermann Neeb 《Journal of Functional Analysis》2010,259(11):2814-1968
In this paper we develop two types of tools to deal with differentiability properties of vectors in continuous representations π:G→GL(V) of an infinite dimensional Lie group G on a locally convex space V. The first class of results concerns the space V∞ of smooth vectors. If G is a Banach-Lie group, we define a topology on the space V∞ of smooth vectors for which the action of G on this space is smooth. If V is a Banach space, then V∞ is a Fréchet space. This applies in particular to C∗-dynamical systems (A,G,α), where G is a Banach-Lie group. For unitary representations we show that a vector v is smooth if the corresponding positive definite function 〈π(g)v,v〉 is smooth. The second class of results concerns criteria for Ck-vectors in terms of operators of the derived representation for a Banach-Lie group G acting on a Banach space V. In particular, we provide for each k∈N examples of continuous unitary representations for which the space of Ck+1-vectors is trivial and the space of Ck-vectors is dense. 相似文献
3.
Karl-Hermann Neeb 《Semigroup Forum》2008,77(1):5-35
A host algebra of a topological group G is a C
*-algebra whose representations are in one-to-one correspondence with certain continuous unitary representations of G. In this paper we present an approach to host algebras for infinite dimensional Lie groups which is based on complex involutive
semigroups. Any locally bounded absolute value α on such a semigroup S leads in a natural way to a C
*-algebra C
*(S,α), and we describe a setting which permits us to conclude that this C
*-algebra is a host algebra for a Lie group G. We further explain how to attach to any such host algebra an invariant weak-*-closed convex set in the dual of the Lie algebra
of G enjoying certain nice convex geometric properties. If G is the additive group of a locally convex space, we describe all host algebras arising this way. The general non-commutative
case is left for the future.
To K.H. Hofmann on the occasion of his 75th birthday 相似文献
4.
In this paper we study U-bounds in relation to L1-type coercive inequalities and isoperimetric problems for a class of probability measures on a general metric space (RN,d). We prove the equivalence of an isoperimetric inequality with several other coercive inequalities in this general framework. The usefulness of our approach is illustrated by an application to the setting of H-type groups, and an extension to infinite dimensions. 相似文献
5.
当人们考察从黎曼流形到 Hibert loop李群的映射时,会遇到一类到无穷维空间R~∞的映射。有关这类映射的一些基本性质不是很清晰,如著名的Arzela-Ascoli定理等。本文建立了 Hilbert loop群映射空间的范数,得到了有界是致密集的充要条件,为进一步研究,如到 Hilbert loop群的调和映射打下了基础。 相似文献
6.
罗光洲 《数学物理学报(B辑英文版)》2011,31(4):1583-1590
Motivated by the idea of M. Ledoux who brings out the connection between Sobolev embeddings and heat kernel bounds, we prove an analogous result for Kohn’s sub-Laplacian on the Heisenberg type groups. The main result includes features of an inequality of either Sobolev or Galiardo-Nirenberg type. 相似文献
7.
The heat kernel measure
t
is constructed on an infinite dimensional complex group using a diffusion in a Hilbert space. Then it is proved that holomorphic polynomials on the group are square integrable with respect to the heat kernel measure. The closure of these polynomials, H L
2(S O
H S
,
t
), is one of two spaces of holomorphic functions we consider. The second space, H L
2(S O()), consists of functions which are holomorphic on an analog of the Cameron–Martin subspace for the group. It is proved that there is an isometry from the first space to the second one.The main theorem is that an infinite dimensional nonlinear analog of the Taylor expansion defines an isometry from H L
2(S O()) into the Hilbert space associated with a Lie algebra of the infinite dimensional group. This is an extension to infinite dimensions of an isometry of B. Driver and L. Gross for complex Lie groups.All the results of this paper are formulated for one concrete group, the Hilbert–Schmidt complex orthogonal group, though our methods can be applied in more general situations. 相似文献
8.
关彦辉 《数学物理学报(A辑)》2001,21(Z1):584-590
1986年,P.Li与丘成桐给出了带凸边界的紧黎曼流形上关于热核的一个Harnack不等式(可参看[6]),而该文的目的正是将他们的工作推广到可能带非凸边界的紧黎曼流形上. 相似文献
9.
In this note, we prove the Stein–Weiss inequality on general homogeneous Lie groups. The obtained results extend previously known inequalities. Special properties of homogeneous norms play a key role in our proofs. Also, we give a simple proof of the Hardy–Littlewood–Sobolev inequality on general homogeneous Lie groups. 相似文献
10.
Enrique Macias Virgós 《Annals of Global Analysis and Geometry》1993,11(1):35-40
We obtain several homotopy obstructions to the existence of non-closed connected Lie subgroupsH in a connected Lie groupG.First we show that the foliationF(G, H) onG determined byH is transversely complete [4]; moreover, forK the closure ofH inG, F(K, H) is an abelian Lie foliation [2].Then we prove that 1(K) and 1(H) have the same torsion subgroup,
n
(K)=
n
(H) for alln 2, and rank1(K) — rank1(H) > codimF(K, H). This implies, for instance, that a contractible (e.g. simply connected solvable) Lie subgroup of a compact Lie group must be abelian. Also, if rank1(G) 1 then any connected invariant Lie subgroup ofG is closed; this generalizes a well-known theorem of Mal'cev [3] for simply connected Lie groups.Finally, we show that the results of Van Est on (CA) Lie groups [6], [7] provide many interesting examples of such foliations. Actually, any Lie group with non-compact centre is the (dense) leaf of a foliation defined by a closed 1-form. Conversely, when the centre is compact, the latter is true only for (CA) Lie groups (e.g. nilpotent or semisimple). 相似文献
11.
This paper is devoted to various considerations on a family of sharp interpolation inequalities on the sphere, which in dimension greater than 1 interpolate between Poincaré, logarithmic Sobolev and critical Sobolev (Onofri in dimension two) inequalities. The connection between optimal constants and spectral properties of the Laplace-Beltrami operator on the sphere is emphasized. The authors address a series of related observations and give proofs based on symmetrization and the ultraspherical setting. 相似文献
12.
On split Lie algebras with symmetric root systems 总被引:1,自引:1,他引:0
Antonio J. Calderón Martín 《Proceedings Mathematical Sciences》2008,118(3):351-356
We develop techniques of connections of roots for split Lie algebras with symmetric root systems. We show that any of such
algebras L is of the form L = + Σ
j
I
j
with
a subspace of the abelian Lie algebra H and any I
j
a well described ideal of L, satisfying [I
j
, I
k
] = 0 if j ≠ k. Under certain conditions, the simplicity of L is characterized and it is shown that L is the direct sum of the family of its minimal ideals, each one being a simple split Lie algebra with a symmetric root system
and having all its nonzero roots connected. 相似文献
13.
A. I. Shtern 《Mathematical Notes》2006,80(3-4):435-441
It is proved that an arbitrary pseudocharacter on a semisimple Lie group is continuous. 相似文献
14.
15.
Tommaso Bruno Marco M. Peloso Anita Tabacco Maria Vallarino 《Journal of Functional Analysis》2019,276(10):3014-3050
Let G be a noncompact connected Lie group, denote with ρ a right Haar measure and choose a family of linearly independent left-invariant vector fields X on G satisfying Hörmander's condition. Let χ be a positive character of G and consider the measure whose density with respect to ρ is χ. In this paper, we introduce Sobolev spaces adapted to X and (, ) and study embedding theorems and algebra properties of these spaces. As an application, we prove local well-posedness and regularity results of solutions of some nonlinear heat and Schrödinger equations on the group. 相似文献
16.
Nathaniel Eldredge 《Journal of Functional Analysis》2010,258(2):504-116
We prove the following gradient inequality for the subelliptic heat kernel on nilpotent Lie groups G of H-type:
|∇Ptf|?KPt(|∇f|), 相似文献
17.
Brian C. Hall 《Journal of Functional Analysis》2008,255(9):2488-2506
Let K be a connected compact semisimple Lie group and KC its complexification. The generalized Segal-Bargmann space for KC is a space of square-integrable holomorphic functions on KC, with respect to a K-invariant heat kernel measure. This space is connected to the “Schrödinger” Hilbert space L2(K) by a unitary map, the generalized Segal-Bargmann transform. This paper considers certain natural operators on L2(K), namely multiplication operators and differential operators, conjugated by the generalized Segal-Bargmann transform. The main results show that the resulting operators on the generalized Segal-Bargmann space can be represented as Toeplitz operators. The symbols of these Toeplitz operators are expressed in terms of a certain subelliptic heat kernel on KC. I also examine some of the results from an infinite-dimensional point of view based on the work of L. Gross and P. Malliavin. 相似文献
18.
19.
P.G.L. Leach 《Journal of Mathematical Analysis and Applications》2006,322(1):288-297
The classical heat polynomials are polynomial solutions of the heat equation. We demonstrate the generation of such polynomials through the medium of the group theoretical properties of the equation. A generalised procedure for the generation of polynomial solutions is presented and this is extended to the construction of related polynomials. 相似文献
20.
Diego Chamorro 《Journal of Mathematical Analysis and Applications》2011,377(2):695-709
We study in this article the improved Sobolev inequalities with Muckenhoupt weights within the framework of stratified Lie groups. This family of inequalities estimate the Lq norm of a function by the geometric mean of two norms corresponding to Sobolev spaces and Besov spaces . When the value p which characterizes Sobolev space is strictly larger than 1, the required result is well known in Rn and is classically obtained by a Littlewood-Paley dyadic blocks manipulation. For these inequalities we will develop here another totally different technique. When p=1, these two techniques are not available anymore and following M. Ledoux (2003) [12], in Rn, we will treat here the critical case p=1 for general stratified Lie groups in a weighted functional space setting. Finally, we will go a step further with a new generalization of improved Sobolev inequalities using weak-type Sobolev spaces. 相似文献