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Of Particular Significance

More on Dark Matter and the Large Hadron Collider

15 Apr 2015, 12:35 UTC
More on Dark Matter and the Large Hadron Collider
(200 words excerpt, click title or image to see full post)

As promised in my last post, I’ve now written the answer to the second of the three questions I posed about how the Large Hadron Collider [LHC] can search for dark matter. You can read the answers to the first two questions here. The first question was about how scientists can possibly look for something that passes through a detector without leaving any trace! The second question is how scientists can tell the difference between ordinary production of neutrinos — which also leave no trace — and production of something else. [The answer to the third question — how one could determine this “something else” really is what makes up dark matter — will be added to the article later this week.]
In the meantime, after Monday’s post, I got a number of interesting questions about dark matter, why most experts are confident it exists, etc. There are many reasons to be confident; it’s not just one argument, but a set of interlocking arguments. One of the most powerful comes from simulations of the universe’s history. These simulations

start with what we think we know about the early universe from the cosmic microwave background [CMB], including the amount of ordinary ...

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