add figure 1
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Notes/Figures/renormalizedF.pdf
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Notes/Figures/renormalizedF.pdf
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@ -840,6 +840,14 @@ Finally, we discuss the renormalized correlation self-energy introduced in this
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In this case the situation is reversed, \ie the divergent denominators will be the last removed when $\Lambda$ is increased.
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Therefore the renormalized self-energy seems not to be the good strategy to remove discontinuities.
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However, it defines SRG-PT2 approximations to the quasiparticle energies which have the same pros as the SRG-MP2 discussed above.
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Schematically, the determinants included in $\Tilde{F}$ and $\Tilde{\Sigma}$ are like in the following figure where blue means that the determinant is included.
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\begin{figure}
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\centering
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\includegraphics[width=0.9\linewidth]{Figures/renormalizedF.pdf}
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\caption{Determinants included at a finite value of $s$ according to the diagonal denominators of $\Tilde{F}$}
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\label{fig:fig_1}
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\end{figure}
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%=================================================================%
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\section{An alternative partitioning designed for discontinuities}
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@ -873,7 +881,7 @@ The idea to obtain this is to start from the full Hamiltonian and use a perturbe
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\\
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\bV{}{}(s) & = \bV{}{'(0)}(s) + \lambda' \bV{}{'(1)}(s) + \lambda'^2 \bV{}{'(2)}(s) + \cdots
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\end{align}
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We can use the expansion in terms of $\lambda$ and transform them to $\lambda^'$ and then identify with the expressions above, for example for $\bF{}{}$
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We can use the expansion in terms of $\lambda$ and transform them to $\lambda'$ and then identify with the expressions above, for example for $\bF{}{}$
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\begin{align}
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\bF{}{}(s) & = \bF{}{(0)}(s) + (1 - \lambda') \bF{}{(1)}(s) + (1 - \lambda')^2 \bF{}{(2)}(s) + \cdots \\
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&= \qty( \bF{}{(0)}(s) + \bF{}{(1)}(s) + \bF{}{(2)}(s) + \cdots) \notag \\
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