We will not discover any hint of cosmic dark matter maybe as a result of our fashions of the early universe are lacking a essential piece, says astrophysicist Dan Hooper



Physics



13 November 2019

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WE SEE its results in how stars transfer inside galaxies, and the way galaxies transfer inside galaxy clusters. With out it, we are able to’t clarify how such massive collections of matter got here to exist, and positively not how they dangle collectively in the present day. However what it’s, we don’t know.

Welcome to one of many largest mysteries within the universe: what makes up most of it. Our greatest measurements point out that some 85 per cent of all matter in our universe consists of “dark matter” fabricated from one thing that isn’t atoms. Enormous underground experiments constructed to catch glimpses of dark matter particles as they move via Earth have seen nothing. Particle-smashing experiments on the Giant Hadron Collider, which we hoped would create dark matter, haven’t no less than so far as we are able to inform. The hunt for dark matter was by no means speculated to be straightforward. However we didn’t count on it to be this difficult.

Dark matter’s no-show signifies that many attainable explanations for it that folks like me favoured simply a decade in the past have now been dominated out. That’s forcing us to radically revisit assumptions not solely concerning the nature of dark matter, but additionally concerning the early historical past of our universe. That is the newest twist in a long-running saga: our failure to detect the particles that make up dark matter means that the start of the universe could have been very completely different from what we imagined.

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Let’s begin with what we do learn about this substance or maybe substances. Dark matter isn’t acquainted atomic matter, or any of the unique types of matter created on the …

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