Stephen Feeney (UCL) gave a nice talk on finding bubble collisions by performing model fits and Bayesian hypothesis tests on the cosmic microwave background maps. He had to make some approximations to do the Bayes integrals. He concludes that the rate of bubble collisions is low (I guess we would be suspicious if he concluded otherwise), but because of resource limitations and decisions made early in the project, he and his team did not test for large-angle signatures, which are expected to be the most common. The good news is that such tests are going to be easy in the near future.
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