Gaby Contardo (Flatiron) and I have been working on time asymmetry in NASA Kepler light curves. Our first attempts on this have been about prediction: Is it easier to predict a point in a light curve using its past or its future? It turns out that, for very deep mathematical reasons, there is a lot of symmetry here, even when the light curve is obviously time asymmetric in seemingly relevant ways. So deep, I think we might have some kind of definition of “stationary”. So we are re-tooling around just observable asymmetries. We discussed many things, including dictionary methods. It also occurred to us that in addition to time-reversal questions, there are also flux-reversal questions (like if you flip a light-curve event upside down).
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