Start cosmology

Signed-off-by: Riccardo Finotello <riccardo.finotello@gmail.com>

sec/part1/fermions.tex

@@ -2843,7 +2843,7 @@ In similar way we can compute all correlators
       \GGexcvacket
     }{\braket{\GGexcvac}}
     \\
-    & =
+    = &
     \frac{%
       \left\langle
         \rR\qty[
@@ -2865,4 +2865,12 @@ using Wick's theorem since the algebra and the action of creation and annihilati
 In particular taking one $\Psi(z)$ and one $\Psi^*(w)$ we get the Green function which is nothing else but the contraction in equation~\eqref{eq:gen_Radial_order}.
 
 
+\subsubsection{Summary and Conclusions}
+
+In a technical and direct way we showed the computation of amplitudes involving an arbitrary number of Abelian spin and matter fields.
+The approach we introduced does not generally rely on \cft techniques and can be seen as an alternative to bosonization and old methods based on the Reggeon vertex.
+Starting from this work the future direction may involve the generalisation to non Abelian spin fields and the application to twist fields.
+In this sense this approach might be the only way to compute the amplitudes involving these complicated scenarios.
+This analytical approach may also shed some light on the non existence of a technique similar to bosonisation for twist fields.
+
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