The Guest Editors for this special issue are

Alexander A. Andrianov (Universitat de Barcelona, Spain and Saint Petersburg State University, Russia)
Carl M. Bender (Washington University, St. Louis, USA)
Hugh F. Jones (Imperial College London, UK)
Andrei Smilga (Universite de Nantes, France)
Miloslav Znojil (Nuclear Physics Institute, Rez, Czech Republic)

The present collection includes papers by participants of the VIIth Workshop “Quantum Physics with Non-Hermitian Operators”, held at Benasque, Spain, June 29 − July 11, 2008.

The issue contains 11 papers with the total of 210 pages.

We would like to thank all the authors who have published papers in the issue, and to give our special thanks to all the referees for providing constructive reviews.

Papers in this Issue:

Non-Hermitian Quantum Systems and Time-Optimal Quantum Evolution

Alexander I. Nesterov
SIGMA 5 (2009), 069, 17 pages   [ abs   pdf   ps ]

Hidden Symmetry from Supersymmetry in One-Dimensional Quantum Mechanics

Alexander A. Andrianov and Andrey V. Sokolov
SIGMA 5 (2009), 064, 26 pages   [ abs   pdf   ps ]

An Alternative Canonical Approach to the Ghost Problem in a Complexified Extension of the Pais-Uhlenbeck Oscillator

A. Déctor, H.A. Morales-Técotl, L.F. Urrutia and J.D. Vergara
SIGMA 5 (2009), 053, 22 pages   [ abs   pdf   ps ]

PT Symmetry and QCD: Finite Temperature and Density

Michael C. Ogilvie and Peter N. Meisinger
SIGMA 5 (2009), 047, 14 pages   [ abs   pdf   ps ]

The Analytic Continuation of the Lippmann-Schwinger Eigenfunctions, and Antiunitary Symmetries

Rafael de la Madrid
SIGMA 5 (2009), 043, 14 pages   [ abs   pdf   ps ]

Intertwining Symmetry Algebras of Quantum Superintegrable Systems

Juan A. Calzada, Javier Negro and Mariano A. del Olmo
SIGMA 5 (2009), 039, 23 pages   [ abs   pdf   ps ]

Inverse Spectral Problems for Tridiagonal N by N Complex Hamiltonians

Gusein Sh. Guseinov
SIGMA 5 (2009), 018, 28 pages   [ abs   pdf   ps ]

Comments on the Dynamics of the Pais-Uhlenbeck Oscillator

Andrei V. Smilga
SIGMA 5 (2009), 017, 13 pages   [ abs   pdf   ps ]

On the Spectrum of a Discrete Non-Hermitian Quantum System

Ebru Ergun
SIGMA 5 (2009), 007, 24 pages   [ abs   pdf   ps ]

Generalized Nonanalytic Expansions, PT-Symmetry and Large-Order Formulas for Odd Anharmonic Oscillators

Ulrich D. Jentschura, Andrey Surzhykov and Jean Zinn-Justin
SIGMA 5 (2009), 005, 10 pages   [ abs   pdf   ps ]

Three-Hilbert-Space Formulation of Quantum Mechanics

Miloslav Znojil
SIGMA 5 (2009), 001, 19 pages   [ abs   pdf   ps ]