Norm estimates of complex symmetric operators applied to quantum systems

Details Norm estimates of complex symmetric operators applied to quantum systems Norm estimates of complex symmetric operators applied to quantum systems

2005-01-10

arxiv.org/abs/math-ph/0501022v2

J. Math. Phys. A: Math and Theor. 39, 389 (2006)

Physics

Mathematical Physics

Scientific paper

10.1088/0305-4470/39/2/009

This paper communicates recent results in theory of complex symmetric operators and shows, through two non-trivial examples, their potential usefulness in the study of Schr\"odinger operators. In particular, we propose a formula for computing the norm of a compact complex symmetric operator. This observation is applied to two concrete problems related to quantum mechanical systems. First, we give sharp estimates on the exponential decay of the resolvent and the single-particle density matrix for Schr\"odinger operators with spectral gaps. Second, we provide new ways of evaluating the resolvent norm for Schr\"odinger operators appearing in the complex scaling theory of resonances.

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