Lisa Randall: evaluation

Transcript context

…Yes, please. Structure formed early on, and now our structure that we live in is… We know about the Milky Way galaxy. The Milky Way galaxy has the disk you can see in a dry dark place, that’s where stars and light is, but you can also measure in some ways the dark matter. We believe that dark matter is more or less spherically distributed. Like we said, there’s a lot of it, not necessarily in the disk, but just because it’s a sphere, there’s a lot of it sitting there. The reason it doesn’t collapse as far as we know is that it can’t radiate the same way. Because it can radiate ordinary matter collapses, and this actually, because of conservation of angular momentum, it stays a disk and it doesn’t just collapse to the center. Our suggestion was that maybe there are some components of dark matter that also radiate. Like I said, that’s far from proven. People have looked for a disk, they see some evidence of some disks of certain densities, but these are all questions that are worth asking. Basically if we can figure it out from existing measurements, why not try? Okay, so not all dark matter is made the same.…

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