27 research outputs found
Matrix Valued Spherical Functions Associated to the Complex Projective Plane
The main purpose of this paper is to compute all irreducible spherical
functions on G=\SU(3) of arbitrary type , where
. This is
accomplished by associating to a spherical function on a matrix
valued function on the complex projective plane . It
is well known that there is a fruitful connection between the hypergeometric
function of Euler and Gauss and the spherical functions of trivial type
associated to a rank one symmetric pair . But the relation of spherical
functions of types of dimension bigger than one with classical analysis, has
not been worked out even in the case of an example of a rank one pair. The
entries of are solutions of two systems of ordinary differential equations.
There is no ready made approach to such a pair of systems, or even to a single
system of this kind. In our case the situation is very favorable and the
solution to this pair of systems can be exhibited explicitely in terms of a
special class of generalized hypergeometric functions .Comment: 70 pages, 1 figur
Three term recursion relation for spherical functions associated to the complex hyperbolic plane
Density results for automorphic forms on Hilbert modular groups
We give density results for automorphic representations of Hilbert modular
groups. In particular, we show that there are infinitely many automorphic
representations that have a prescribed discrete series factor at some (but not
all) real places.Comment: 35 pages, LaTe
Time and band limiting for matrix valued functions, an example
The main purpose of this paper is to extend to a situation involving matrix valued
orthogonal polynomials and spherical functions, a result that traces its origin and its importance
to work of Claude Shannon in laying the mathematical foundations of information theory and to
a remarkable series of papers by D. Slepian, H. Landau and H. Pollak. To our knowledge, this
is the rst example showing in a non-commutative setup that a bispectral property implies that
the corresponding global operator of \time and band limiting" admits a commuting local operator.
This is a noncommutative analog of the famous prolate spheroidal wave operator
Spherical Functions Associated With the Three Dimensional Sphere
In this paper, we determine all irreducible spherical functions \Phi of any K
-type associated to the pair (G,K)=(\SO(4),\SO(3)). This is accomplished by
associating to \Phi a vector valued function H=H(u) of a real variable u, which
is analytic at u=0 and whose components are solutions of two coupled systems of
ordinary differential equations. By an appropriate conjugation involving Hahn
polynomials we uncouple one of the systems. Then this is taken to an uncoupled
system of hypergeometric equations, leading to a vector valued solution P=P(u)
whose entries are Gegenbauer's polynomials. Afterward, we identify those
simultaneous solutions and use the representation theory of \SO(4) to
characterize all irreducible spherical functions. The functions P=P(u)
corresponding to the irreducible spherical functions of a fixed K-type \pi_\ell
are appropriately packaged into a sequence of matrix valued polynomials
(P_w)_{w\ge0} of size (\ell+1)\times(\ell+1). Finally we proved that \widetilde
P_w={P_0}^{-1}P_w is a sequence of matrix orthogonal polynomials with respect
to a weight matrix W. Moreover we showed that W admits a second order symmetric
hypergeometric operator \widetilde D and a first order symmetric differential
operator \widetilde E.Comment: 49 pages, 2 figure
Forma canónica de Jordan
Para resolver problemas relacionados con una matriz u operador lineal A. es importante poder reducir A a una forma sencilla. mediante un conveniente cambio de base. Uno desearía, en lo posible, llevar A a forma diagonal, pero no toda matriz es diagonalizable. Sin embargo el matemático francés e o Jordan demostró que siempre es posible, mediante un cambio de base. representar A por medio de una matriz triangular superior con bloques de una forma particular sencilla. Esta matriz especial, unívocamente asociada a cada matriz compleja A es la llamada forma de Jordan de A. Además de la gran importancia teórica de la forma de Jordan, el conocerla explícitamente es útil en muchos problemas matemáticos. por ejemplo. para resolver sistemas lineales de ecuaciones diferenciales del tipo X' = A X. El objeto de este trabajo es dar un método efectivo para hallar la forma de Jordan de A, suponiendo conocidos sus autovalores. y presentar una variedad de ejemplos ilustrativos
Time and Band Limiting for Matrix Valued Functions, an Example
The main purpose of this paper is to extend to a situation involving matrix valued orthogonal polynomials and spherical functions, a result that traces its origin and its importance to work of Claude Shannon in laying the mathematical foundations of information theory and to a remarkable series of papers by D. Slepian, H. Landau and H. Pollak. To our knowledge, this is the first example showing in a non-commutative setup that a bispectral property implies that the corresponding global operator of ''time and band limiting'' admits a commuting local operator. This is a noncommutative analog of the famous prolate spheroidal wave operator