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Manuscript/sfBSE.tex

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 	\email{loos@irsamc.ups-tlse.fr}
 	\affiliation{\LCPQ}
 
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 \begin{abstract}
 Like adiabatic time-dependent density-functional theory (TD-DFT), the Bethe-Salpeter equation (BSE) formalism in its static approximation is ``blind'' to double (and higher) excitations, which are, for example, ubiquitous in conjugated molecules like polyenes. 
 Here, we apply the spin-flip technique (which consists in considering the lowest triplet state as the reference configuration instead of the singlet ground state) to the BSE formalism of many-body perturbation theory in order to access double excitations.