On Horn’s Problem and Its Volume Function
On Horn’s Problem and Its Volume Function
复制标题
论霍恩问题及其体积函数
DOI:
10.1007/s00220-019-03646-7
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发表时间:
2020
影响因子:
2.4
通讯作者:
Zuber, Jean-Bernard
中科院分区:
文献类型:
--
作者:
Coquereaux, Robert;McSwiggen, Colin;Zuber, Jean-Bernard
We consider an extended version of Horn’s problem: given two orbitsandof a linear representation of a compact Lie group, let,be independent and invariantly distributed random elements of the two orbits. The problem is to describe the probability distribution of the orbit of the sum. We study in particular the familiar case of coadjoint orbits, and also the orbits of self-adjoint real, complex and quaternionic matrices under the conjugation actions of,andrespectively. The probability density can be expressed in terms of a function that we call the volume function. In this paper, (i) we relate this function to the symplectic or Riemannian geometry of the orbits, depending on the case; (ii) we discuss its non-analyticities and possible vanishing; (iii) in the coadjoint case, we study its relation to tensor product multiplicities (generalized Littlewood–Richardson coefficients) and show that it computes the volume of a family of convex polytopes introduced by Berenstein and Zelevinsky. These considerations are illustrated by a detailed study of the volume function for the coadjoint orbits of.
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DOI:
--
发表时间:
2018
期刊:
Symmetry, Integrability and Geometry: Methods and Applications
影响因子:
--
作者:
R. Coquereaux;J. Zuber
通讯作者:
J. Zuber
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
G. Heckman
通讯作者:
G. Heckman
DOI:
10.1016/j.jcta.2007.05.009
发表时间:
2007
期刊:
J. Comb. Theory A
影响因子:
--
作者:
M. Beck;Steven V. Sam;Kevin M. Woods
通讯作者:
Kevin M. Woods
影响因子:
2.4
作者:
Colin S. McSwiggen
通讯作者:
Colin S. McSwiggen
DOI:
--
发表时间:
1965
期刊:
影响因子:
--
作者:
F. Gürsey
通讯作者:
F. Gürsey