Physical Review Letters

The case for co-decaying dark matter

(Phys.org)—There isn't as much dark matter around today as there used to be. According to one of the most popular models of dark matter, the universe contained much more dark matter early on when the temperature was hotter. ...

dateDec 05, 2016 in General Physics feature
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A friend of a friend is... a dense network

It's a familiar request in the digital age: one of your friends on social media has a friend who wants to be your friend. Frequent linking among friends of friends can cause a rapid increase in social network connectivity.

dateDec 01, 2016 in General Physics
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