A wonderful new paper by my student Adam Batten. Mysterious explosions occur across the sky from distant galaxies, visible only with radio telescopes, known as Fast Radio Bursts (FRBs). There illuminate the intervening material as they travel to our telescopes, allowing us to probe that otherwise hard to image Cosmic Web. But how do we know what that should look like? Simulations like EAGLE predict that distribution and in this beautiful work by Adam we can therefore shine simulated FRBs through this to create predictions for the dispersion measure. This then is directly tested by the telescopes.
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This is one of the most fun papers I have ever written (and not just because of the title). The picture astronomers have of the early universe is one of galaxies growing rapidly, turning vast quantities of gas rich clouds into stars in a boom-time of star formation. By using the Smaug simulations of this period I and my DRAGONS colleagues were able to explore this picture. We found that cold gas is indeed consumed rapidly, in just 300 million years irrespective of how stars explode or that gas can cool. However, theres so much material pouring into the galaxies at this time that they simply can't consume it all! A system where demand (gas turing into stars) can't raise to meet supply (of new primary material flowing in) is a recession.
Far from a booming bull-market, the early Universe was a recessionary bear-market and that's why I love this paper...
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