Love stories can be unpredictable: Jules et Jim in the vortex of life

Dercole, F. & Rinaldi, S. (2014). Love stories can be unpredictable: Jules et Jim in the vortex of life. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-14-025

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Abstract

Love stories are dynamic processes that begin, develop, and often stay for a relatively long time in stationary or fluctuating regime, before possibly fading. Although they are, undoubtedly, the most important dynamic process in our life, they have only recently been cast in the formal frame of dynamical systems theory. In particular, why it is so difficult to predict the evolution of sentimental relationships continues to be largely unexplained. A common reason for this is that love stories reflect the turbulence of the surrounding social environment. But we can also imagine that the interplay of the characters involved contributes to make the story unpredictable, that is, chaotic. In other words, we conjecture that sentimental chaos can have a relevant endogenous origin. To support this intriguing conjecture, we mimic a real and well-documented love story with a mathematical model in which the environment is kept constant, and show that the model is chaotic. The case we analyze is the triangle described in Jules et Jim, an autobiographic novel by Henri-Pierr Roche that became famous worldwide after the success of the homonymous film directed by Fran8cois Truffaut.

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