Generalized Householder Transformations for the Complex Symmetric Eigenvalue Problem

Abstract

We present an intuitive and scalable algorithm for the diagonalization of complex symmetric matrices, which arise from the projection of pseudo--Hermitian and complex scaled Hamiltonians onto a suitable basis set of "trial" states. The algorithm diagonalizes complex and symmetric (non--Hermitian) matrices and is easily implemented in modern computer languages. It is based on generalized Householder transformations and relies on iterative similarity transformations T -> T' = Q^T T Q, where Q is a complex and orthogonal, but not unitary, matrix, i.e, Q^T equals Q^(-1) but Q^+ is different from Q^(-1). We present numerical reference data to support the scalability of the algorithm. We construct the generalized Householder transformations from the notion that the conserved scalar product of eigenstates Psi_n and Psi_m of a pseudo-Hermitian quantum mechanical Hamiltonian can be reformulated in terms of the generalized indefinite inner product [integral of the product Psi_n(x,t) Psi_m(x,t) over dx], where the integrand is locally defined, and complex conjugation is avoided. A few example calculations are described which illustrate the physical origin of the ideas used in the construction of the algorithm.

14 pages; RevTeX; font mismatch in Eqs. (3) and (15) is eliminated

References in corpus (4)

• Imaginary Cubic Perturbation: Numerical and Analytic Study
• Unified Treatment of Even and Odd Anharmonic Oscillators of Arbitrary Degree
• From Generalized Dirac Equations to a Candidate for Dark Energy
• Structure, Time Propagation and Dissipative Terms for Resonances

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