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Quantum and Classical Statistical Mechanics of a Class of non-Hermitian Hamiltonians

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arxiv 0905.2879 v2 pith:H6ELOBIT submitted 2009-05-18 quant-ph hep-th

Quantum and Classical Statistical Mechanics of a Class of non-Hermitian Hamiltonians

classification quant-ph hep-th
keywords quantumclassclassicalfunctionhermitiannon-hermitianpartitionspectrum
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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This paper investigates the thermodynamics of a large class of non-Hermitian, $PT$-symmetric oscillators, whose energy spectrum is entirely real. The spectrum is estimated by second-order WKB approximation, which turns out to be very accurate even for small quantum numbers, and used to generate the quantum partition function. Graphs showing the thermal behavior of the entropy and the specific heat, at all regimes of temperature, are given. To obtain the corresponding classical partition function it turns out to be necessary in general to integrate over a complex "phase space". For the wrong-sign quartic, whose equivalent Hermitian Hamiltonian is known exactly, it is demonstrated explicitly how this formulation arises, starting from the Hermitian case.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Kubo-Martin-Schwinger conditions for non-Hermitian systems

    quant-ph 2026-06 unverdicted novelty 7.0

    Positivity of the biorthogonal Gibbs functional characterizes quasi-Hermiticity for diagonalisable non-Hermitian operators with real spectra, and the resulting state satisfies the three analytic KMS conditions.

  2. Kubo-Martin-Schwinger conditions for non-Hermitian systems

    quant-ph 2026-06 unverdicted novelty 7.0

    For any diagonalisable non-Hermitian H with real spectrum, the biorthogonal Gibbs functional satisfies positivity of ω_bi(A†A) for all A if and only if H is quasi-Hermitian.