Geodesic
Adiabatic approximation for the evolution generated by an $A$-uniformly pseudo-Hermitian Hamiltonian
Teoretičeskaâ i matematičeskaâ fizika, Tome 192 (2017) no. 3, pp. 489-505 Cet article a éte moissonné depuis la source Math-Net.Ru

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We discuss an adiabatic approximation for the evolution generated by an $A$-uniformly pseudo-Hermitian Hamiltonian $H(t)$. Such a Hamiltonian is a time-dependent operator $H(t)$ similar to a time-dependent Hermitian Hamiltonian $G(t)$ under a time-independent invertible operator $A$. Using the relation between the solutions of the evolution equations $H(t)$ and $G(t)$, we prove that $H(t)$ and $H^{\dagger}(t)$ have the same real eigenvalues and the corresponding eigenvectors form two biorthogonal Riesz bases for the state space. For the adiabatic approximate solution in case of the minimum eigenvalue and the ground state of the operator $H(t)$, we prove that this solution coincides with the system state at every instant if and only if the ground eigenvector is time-independent. We also find two upper bounds for the adiabatic approximation error in terms of the norm distance and in terms of the generalized fidelity. We illustrate the obtained results with several examples.
Mots-clés : adiabatic evolution
Keywords: adiabatic approximation, error estimate, uniformly pseudo-Hermitian Hamiltonian. 
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     title = {Adiabatic approximation for the~evolution generated by an~$A$-uniformly {pseudo-Hermitian} {Hamiltonian}},
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Wenhua Wang; Huaixin Cao; Zhengli Chen. Adiabatic approximation for the evolution generated by an $A$-uniformly pseudo-Hermitian Hamiltonian. Teoretičeskaâ i matematičeskaâ fizika, Tome 192 (2017) no. 3, pp. 489-505. http://geodesic.mathdoc.fr/item/TMF_2017_192_3_a6/

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