Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
| documentation:language_reference:functions:shellaverage [2026/11/12 18:01] – created Maurits W. Haverkort | documentation:language_reference:functions:shellaverage [2026/11/12 18:05] (current) – Maurits W. Haverkort | ||
|---|---|---|---|
| Line 76: | Line 76: | ||
| $$ | $$ | ||
| - | \begin{equation} \nonumber | ||
| P[O] = \int \mathrm{d}U \; U \, O \, U^{\dagger} . | P[O] = \int \mathrm{d}U \; U \, O \, U^{\dagger} . | ||
| - | \end{equation} | ||
| $$ | $$ | ||
| Line 94: | Line 92: | ||
| $$ | $$ | ||
| - | \begin{equation} \nonumber | ||
| \hat{1}_{\Lambda^p} = \sum_{\tau_1 < \tau_2 < \cdots < \tau_p} a^{\dagger}_{\tau_1} \cdots a^{\dagger}_{\tau_p} a^{\phantom{\dagger}}_{\tau_p} \cdots a^{\phantom{\dagger}}_{\tau_1} = \frac{1}{p!} \hat{N} (\hat{N}-1) \cdots (\hat{N}-p+1) . | \hat{1}_{\Lambda^p} = \sum_{\tau_1 < \tau_2 < \cdots < \tau_p} a^{\dagger}_{\tau_1} \cdots a^{\dagger}_{\tau_p} a^{\phantom{\dagger}}_{\tau_p} \cdots a^{\phantom{\dagger}}_{\tau_1} = \frac{1}{p!} \hat{N} (\hat{N}-1) \cdots (\hat{N}-p+1) . | ||
| - | \end{equation} | ||
| $$ | $$ | ||
| Line 112: | Line 108: | ||
| $$ | $$ | ||
| - | \begin{eqnarray} \nonumber | + | U_{\mathrm{av}}(p) = F^0 - \frac{2}{25} F^2 |
| - | U_{\mathrm{av}}(p) | + | $$ |
| - | U_{\mathrm{av}}(d) | + | $$ |
| - | U_{\mathrm{av}}(f) | + | U_{\mathrm{av}}(d) = F^0 - \frac{2}{63} \left( F^2 + F^4 \right) |
| - | \end{eqnarray} | + | $$ |
| + | $$ | ||
| + | U_{\mathrm{av}}(f) = F^0 - \frac{4}{195} F^2 - \frac{2}{143} F^4 - \frac{100}{5577} F^6, | ||
| $$ | $$ | ||
| Line 124: | Line 122: | ||
| $$ | $$ | ||
| - | \begin{equation} \nonumber | ||
| U_{\mathrm{av}}(pd) = F^0_{pd} - \frac{1}{15} G^1_{pd} - \frac{3}{70} G^3_{pd} . | U_{\mathrm{av}}(pd) = F^0_{pd} - \frac{1}{15} G^1_{pd} - \frac{3}{70} G^3_{pd} . | ||
| - | \end{equation} | ||
| $$ | $$ | ||
| Line 157: | Line 153: | ||
| $$ | $$ | ||
| - | \begin{equation} \nonumber | ||
| \epsilon_{\uparrow} \hat{N}_{\uparrow} + \epsilon_{\downarrow} \hat{N}_{\downarrow} | \epsilon_{\uparrow} \hat{N}_{\uparrow} + \epsilon_{\downarrow} \hat{N}_{\downarrow} | ||
| + \tfrac{1}{2} U_{\uparrow\uparrow} \hat{N}_{\uparrow} (\hat{N}_{\uparrow}-1) | + \tfrac{1}{2} U_{\uparrow\uparrow} \hat{N}_{\uparrow} (\hat{N}_{\uparrow}-1) | ||
| + \tfrac{1}{2} U_{\downarrow\downarrow} \hat{N}_{\downarrow} (\hat{N}_{\downarrow}-1) | + \tfrac{1}{2} U_{\downarrow\downarrow} \hat{N}_{\downarrow} (\hat{N}_{\downarrow}-1) | ||
| + U_{\uparrow\downarrow} \hat{N}_{\uparrow} \hat{N}_{\downarrow} . | + U_{\uparrow\downarrow} \hat{N}_{\uparrow} \hat{N}_{\downarrow} . | ||
| - | \end{equation} | ||
| $$ | $$ | ||