dark matter

How Do You Count Parallel Universes? You Can't Just Go 1, 2, 3, ...

Introducing a whole new breed of number, the p-adics.

Cosmologists have been thinking for years that our universe might be just one bubble amid countless bubbles floating in a formless void. And when they say “countless,” they really mean it. Those universes are damned hard to count. Angels on a pin are nothing to this. There’s no unambiguous way to count items in an […]

Charismatic Megaparticles Might Hint at Dark Matter, and Much Besides

Out in the cosmos, “dark accelerators” slingshot particles to huge speeds and no one knows why.

At a lecture I went to some years ago, astrophysicist Trevor Weekes compared garden-variety elementary particles to mosquitoes. They are plentiful and easy to find—indeed, they find you. But ultra-high-energy gamma rays, he said, are like elephants. They are fairly rare, but among the greatest of creatures. They often roam in spectacular habitats. Their sheer […]

Is Dark Matter a Glimpse of a Deeper Level of Reality?

Many theoretical physicists speculate that space and time arise from deeper physics. Erik Verlinde goes them one further.

SANTA BARBARA—Two years ago several of my Sci Am colleagues and I had an intense email exchange over a period of weeks, trying to figure out what to make of a new paper by string theorist Erik Verlinde. I don’t think I’ve ever been so flummoxed by physicists’ reactions to a paper. Mathematically it could […]

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