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A formally exact one-frequency-only Bethe-Salpeter-like equation. Similarities and differences between <b> <i>GW</i> </b>+BSE and self-consistent RPA
A formally exact Bethe-Salpeter-like equation for the linear-response function is introduced with a kernel which depends only on the one frequency of the applied field. This is in contrast with the standard Bethe-Salpeter equation (BSE) which involves multiple-frequency integrals over the kernel and response functions. From the one-frequency kernel, known …