Download PDF by Philip Feinsilver, René Schott (auth.): Algebraic Structures and Operator Calculus: Volume III:

By Philip Feinsilver, René Schott (auth.)

ISBN-10: 9400901577

ISBN-13: 9789400901575

ISBN-10: 9401065578

ISBN-13: 9789401065573

Introduction I. basic feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 II. Notations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five III. Lie algebras: a few fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eight bankruptcy 1 Operator calculus and Appell platforms I. Boson calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 II. Holomorphic canonical calculus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 III. Canonical Appell platforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 bankruptcy 2 Representations of Lie teams I. Coordinates on Lie teams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 II. twin representations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 III. Matrix parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 IV. brought on representations and homogeneous areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty common Appell structures bankruptcy three I. Convolution and stochastic procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty four II. Stochastic techniques on Lie teams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty six III. Appell platforms on Lie teams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . forty nine bankruptcy four Canonical platforms in different variables I. Homogeneous areas and Cartan decompositions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . fifty four II. triggered illustration and coherent states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sixty two III. Orthogonal polynomials in different variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sixty eight bankruptcy five Algebras with discrete spectrum I. Calculus on teams: assessment of the idea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eighty three II. Finite-difference algebra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eighty five III. q-HW algebra and uncomplicated hypergeometric features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 IV. su2 and Krawtchouk polynomials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ninety three V. e2 and Lommel polynomials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . one zero one bankruptcy 6 Nilpotent and solvable algebras I. Heisenberg algebras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 II. Type-H Lie algebras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 Vll III. Upper-triangular matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . one hundred twenty five IV. Affine and Euclidean algebras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 bankruptcy 7 Hermitian symmetric areas I. easy constructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 II. area of oblong matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 III. house of skew-symmetric matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 IV. house of symmetric matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 bankruptcy eight homes of matrix components I. Addition formulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 II. Recurrences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 III. Quotient representations and summation formulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 bankruptcy nine Symbolic computations I. Computing the pi-matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 II. Adjoint team . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 III. Recursive computation of matrix parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Extra info for Algebraic Structures and Operator Calculus: Volume III: Representations of Lie Groups

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The monomials xn are built by successive multiplication by Xi, which we denote by the operators Xi: Xix n = x n+ej . , the raising operator is given by R = etH X e- tH we have [e tH ,Xi] = t(8Hj8Dj)e tH , so that . By the holomorphic operator calculus as we have seen previously (for t = 1). The mapping (X, D) --+ (R, V) is given by the Heisenberg-Hamiltonian flow which induces an automorphism of the entire Heisenberg-Weyl algebra. As t varies, writing X(t) for R, we have the Heisenberg-Hamiltonian equations of motion (suppressing subscripts) .

1 Theorem. For the left and right dual representations we have the differential recurrence relations: with the A-variables understood. 1. 1). , equivalently, to multiplication by A and differentiation, on cn(A). 2 Corollary. Proof: directly IV. , (r;:) A = (c)ncm(A), since the left and right duals commute. we have • Induced representations and homogeneous spaces Homogeneous spaces are quotient spaces, such as cosets of the group modulo a subgroup. Here we have a subalgebra, Q, say, and take a quotient of U(9) mapping the subalgebra to zero or to scalars.

K7r*(d -lld)Adged = exp(Ad~d)dkged as required. Thus the result. 3 Chapter 2 DIFFERENTIAL RELATIONS ° We will show that the right dual vector fields generate the action of the group on functions. We will explicitly indicate the dependence of 9 on by writing g(A, for g(A). Then we can indicate by writing for that we are using the particular realization of the Lie algebra given by the right dual representation. 1 Lemma. Denote by g(A', e*) the group element g(A') with for smooth functions f, g(A', e*)f(A) = f(A 0 A') Proof: ereplaced by e*.

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Algebraic Structures and Operator Calculus: Volume III: Representations of Lie Groups by Philip Feinsilver, René Schott (auth.)


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