Science & Technology

Physicists Present a New Theory on the Origin of Dark Matter

Calculations for the new darkish matter mannequin developed at Mainz College

Physicists have now provide you with a new idea on how darkish matter could have been fashioned, proposing an alternative choice to the WIMP paradigm.

Solely a small half of the universe consists of seen matter. By far the largest half is invisible and consists of darkish matter and darkish power. Little or no is thought about darkish power, however there are a lot of theories and experiments on the existence of darkish matter designed to seek out these as but unknown particles. Scientists at Johannes Gutenberg College Mainz (JGU) have now provide you with a new idea on how darkish matter could have been fashioned shortly after the origin of the universe. This new mannequin proposes an alternative choice to the WIMP paradigm that’s the topic of numerous experiments in present analysis.

Dark matter is current all through the universe, forming galaxies and the largest identified buildings in the cosmos. It makes up round 23 p.c of our universe, whereas the particles seen to us that make up the stars, planets, and even life on Earth symbolize solely about 4 p.c of it. The present assumption is that darkish matter is a cosmological relic that has primarily remained secure since its creation. “We’ve referred to as this assumption into query, displaying that at the starting of the universe darkish matter could have been unstable,” defined Dr. Michael Baker from the Theoretical Excessive Vitality Physics (THEP) group at the JGU Institute of Physics. This instability additionally signifies the existence of a new mechanism that explains the noticed amount of darkish matter in the cosmos.

In the new darkish matter mannequin, the Higgs particle has completely different properties to these in the commonplace mannequin of particle physics. The determine reveals the power of the Higgs particle as a operate of the mannequin parameters.

The soundness of darkish matter is normally defined by a symmetry precept. Nevertheless, of their paper, Dr. Michael Baker and Professor Joachim Kopp show that the universe could have gone by a section throughout which this symmetry was damaged. This may imply that it’s potential for the hypothetical darkish matter particle to decay. Throughout the electroweak section transition, the symmetry that stabilizes darkish matter would have been reestablished, enabling it to live on in the universe to the current day.

With their new idea, Baker and Kopp have launched a new precept into the debate about the nature of darkish matter that gives an alternative choice to the extensively accepted WIMP idea. To date, WIMPs, or weakly interacting large particles, have been considered the almost certainly elements of darkish matter, and experiments involving closely shielded underground detectors have been carried out to search for them. “The absence of any convincing indicators precipitated us to begin searching for alternate options to the WIMP paradigm,” mentioned Kopp.

The 2 physicists declare that the new mechanism they suggest could also be related with the obvious imbalance between matter and antimatter in the cosmos and will depart an imprint which might be detected in future experiments on gravitational waves. Of their paper printed in the scientific journal Bodily Overview Letters, Baker and Kopp additionally point out the prospects of discovering proof of their new precept at CERN’s LHC particle accelerator and different experimental amenities.

Publication: Michael J. Baker and Joachim Kopp, “Dark Matter Decay between Section Transitions at the Weak Scale,” Phys. Rev. Lett. 119, 061801, 2017; doi:10.1103/PhysRevLett.119.061801

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