The (4,0)-multichannel Dyson equation, coupling two- and four-body Green's functions, describes single and double neutral excitations in a two-level model, unlike static BSE.
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Multichannel Dyson equations for even- and odd-order Green's functions: application to double excitations
The (4,0)-multichannel Dyson equation, coupling two- and four-body Green's functions, describes single and double neutral excitations in a two-level model, unlike static BSE.