From b4d68122a5f96d02f94043656a1bd8115b529300 Mon Sep 17 00:00:00 2001 From: Jaron Kent-Dobias Date: Wed, 2 Feb 2022 22:59:59 +0100 Subject: Added figure showing the contour on the complex hyperbola. --- stokes.tex | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'stokes.tex') diff --git a/stokes.tex b/stokes.tex index 6485ed7..37dacbf 100644 --- a/stokes.tex +++ b/stokes.tex @@ -160,6 +160,30 @@ integrals can have their contour freely deformed (under some constraints) without changing their value. This means that we are free to choose a nicer contour than our initial phase space $\Omega$. +\begin{figure} + \includegraphics{figs/hyperbola_1.pdf}\hfill + \includegraphics{figs/hyperbola_2.pdf}\hfill + \includegraphics{figs/hyperbola_3.pdf}\\ + \includegraphics{figs/anglepath_1.pdf}\hfill + \includegraphics{figs/anglepath_2.pdf}\hfill + \includegraphics{figs/anglepath_3.pdf} + + \caption{ + A schematic picture of the complex phase space for the circular $p$-spin + model and its standard integration contour. (Top, all): For real variables, + the model is a circle, and its analytic continuation is a kind of complex + hyperbola, here shown schematically in three dimensions. (Bottom, all): + Since the real manifold (the circle) is one-dimensional, the complex + manifold has one complex dimension, here parameterized by the angle + $\theta$ on the circle. (Left): The integration contour over the real phase + space of the circular model. (Center): Complex analysis implies that the + contour can be freely deformed without changing the value of the integral. + (Right): A funny deformation of the contour in which pieces have been + pinched off to infinity. So long as no poles have been crossed, even this + is legal. + } +\end{figure} + What contour properties are desirable? Consider the two main motivations cited in the introduction for performing analytic continuation in the first place: we want our partition function to be well-defined, e.g., for the phase space -- cgit v1.2.3-70-g09d2