add figure 1

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Antoine Marie 2022-11-15 22:31:38 +01:00
parent fe38e71dd6
commit 738c5cb230
2 changed files with 9 additions and 1 deletions

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