A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Schrödinger perturbation theory. Instead of taking the operator directly from a model problem, it is constructed to be a best fit to the exact Hamiltonian within any desired functional form. When applied to many-body perturbation theory for electrons, strongly improved convergence is observed in cases where the conventional Fock Hamiltonian leads to divergence or slow convergence
Adaptive perturbation is a new method for perturbatively computing the eigenvalues and eigenstates o...
We propose a new approach to determine a suitable zeroth-order wavefunction for multiconfigurational...
Within quantum mechanics model we study the problem of resummation of an asymptotic perturbation ser...
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Sch...
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Sch...
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Sch...
A new procedure for the splitting of many-body Hamiltonians into 'free' and 'interaction' parts is p...
Perturbative methods are attractive to describe the electronic structure of molecular systems becaus...
We describe a formulation of multi-reference perturbation theory that obtains a rigorous upper bound...
It is well known that quantum-mechanical perturbation theory often give rise to divergent series tha...
Abstract The problem of partitioning in perturbation theory is reviewed starting from the classical ...
Many-body and Rayleigh-Schrodinger perturbation theories have traditionally been applied to a single...
We describe a formulation of multi-reference perturbation theory that obtains a rigorous upper bound...
Adaptive perturbation is a new method for perturbatively computing the eigenvalues and eigenstates o...
Low bounds to energy eigenvalues in quantum theory problems by partitioning technique for positive p...
Adaptive perturbation is a new method for perturbatively computing the eigenvalues and eigenstates o...
We propose a new approach to determine a suitable zeroth-order wavefunction for multiconfigurational...
Within quantum mechanics model we study the problem of resummation of an asymptotic perturbation ser...
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Sch...
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Sch...
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Sch...
A new procedure for the splitting of many-body Hamiltonians into 'free' and 'interaction' parts is p...
Perturbative methods are attractive to describe the electronic structure of molecular systems becaus...
We describe a formulation of multi-reference perturbation theory that obtains a rigorous upper bound...
It is well known that quantum-mechanical perturbation theory often give rise to divergent series tha...
Abstract The problem of partitioning in perturbation theory is reviewed starting from the classical ...
Many-body and Rayleigh-Schrodinger perturbation theories have traditionally been applied to a single...
We describe a formulation of multi-reference perturbation theory that obtains a rigorous upper bound...
Adaptive perturbation is a new method for perturbatively computing the eigenvalues and eigenstates o...
Low bounds to energy eigenvalues in quantum theory problems by partitioning technique for positive p...
Adaptive perturbation is a new method for perturbatively computing the eigenvalues and eigenstates o...
We propose a new approach to determine a suitable zeroth-order wavefunction for multiconfigurational...
Within quantum mechanics model we study the problem of resummation of an asymptotic perturbation ser...
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