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Dark Matter Formed When Fast Particles Slowed Down and Got Heavy, New Theory Says

2 months ago
Dartmouth researchers propose that dark matter originated from massless, light-like particles in the early universe that rapidly condensed into massive particles through a spin-based interaction. Phys.Org reports: [T]he study authors write that their theory is distinct because it can be tested using existing observational data. The extremely low-energy particles they suggest make up dark matter would have a unique signature on the cosmic microwave background, or CMB, the leftover radiation from the Big Bang that fills all of the universe. "Dark matter started its life as near-massless relativistic particles, almost like light," says Robert Caldwell, a professor of physics and astronomy and the paper's senior author. "That's totally antithetical to what dark matter is thought to be -- it is cold lumps that give galaxies their mass," Caldwell says. "Our theory tries to explain how it went from being light to being lumps." Hot, fast-moving particles dominated the cosmos after the burst of energy known as the Big Bang that scientists believe triggered the universe's expansion 13.7 billion years ago. These particles were similar to photons, the massless particles that are the basic energy, or quanta, of light. It was in this chaos that extremely large numbers of these particles bonded to each other, according to Caldwell and Guanming Liang, the study's first author and a Dartmouth senior. They theorize that these massless particles were pulled together by the opposing directions of their spin, like the attraction between the north and south poles of magnets. As the particles cooled, Caldwell and Liang say, an imbalance in the particles' spins caused their energy to plummet, like steam rapidly cooling into water. The outcome was the cold, heavy particles that scientists think constitute dark matter. The findings have been published in the journal Physical Review Letters.

Read more of this story at Slashdot.

BeauHD

Jilted AWS reckons VMware is now crusty like a mainframe

2 months ago
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Simon Sharwood

Error'd: Teamwork

2 months ago

Whatever would we do without teamwork.

David doesn't know. "Microsoft Teams seems to have lost count (it wasn't a very big copy/paste)"

 

A follow-up from an anonymous doesn't know either. "Teams doing its best impression of a ransom note just to say you signed out. At least it still remembers how to suggest closing your browser. Small victories."

 

Bob F. just wants to make memes. "I've been setting my picture widths in this document to 7.5" for weeks, and suddenly after the latest MS Word update, Microsoft thinks 7.5 is not between -22.0 and 22.0. They must be using AI math to determine this."

 

Ewan W. wonders "a social life: priceless...?". Ewan has some brand confusion but after the Boom Battle Bar I bet I know why.

 

Big spender Bob B. maybe misunderstands NaN. He gleefully exclaims "I'm very happy to get 15% off - Here's hoping the total ends up as NaN and I get it all free." Yikes. 191.78-NaN is indeed NaN, but that just means you're going to end up owing them NaN. Don't put that on a credit card!

 

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Lyle Seaman