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Dark matter particles may be Anapole
Dark matter particles may be Anapole
“Most of the models of dark matter suggest that it is only interact through exotic forces that we do not encounter in everyday life. Anapole dark matter using ordinary electromagnetism, you read about even in school – the same force that allows the magnets mounted on the fridge or pop balloons rubbed on the hair – to the wall. ”
So said Robert Scherrer, a theoretical physicist at Vanderbilt University.
“In addition, this model gives very specific predictions about the rate at which the dark matter should be shown in dark matter detectors, hidden under the ground around the world. Projections show that in the near future Anapole existence of dark matter can be opened or refuted by experiment. ”
Summary of the matter in the universe can be made of particles which have an unusual electromagnetic field in the form of a donut – anapole. This new theory, which gives a dark matter particle rare form of electromagnetism, has become more popular after detailed analysis and Scherrer PhD Chiu Man Ho.
“There are a lot of different theories about the nature of dark matter. What I like about this theory – its simplicity, uniqueness and the fact that it can be tested, “- says Scherrer.
In an article titled “Anapole dark matter” of physics suggest that dark matter, an invisible form of matter, which is 85% of the entire matter of the universe may consist of particles called Majorana fermions. Their existence was predicted in the 30’s of last century, but since then has not been proven.
A number of physicists believe that dark matter is composed of Majorana particles, but Scherrer and Ho had detailed calculations have shown that these particles have a unique electromagnetic field in the shape of a donut called “anapole”. Field gives the particles properties that are different from those of other particles with the more common double fields (north-south direction, positive and negative), and explains why the particles that hard to fix.
Fermions – like electrons and quarks – the building blocks of matter. Their existence was predicted by Paul Dirac in 1928. Ten years later, shortly before the mysterious disappearance at sea, the Italian Ettore Majorana physics slightly changed the wording of Dirac, thus suggested the existence of an electrically neutral fermion. Since then, physicists have long searched for Majorana fermions. The main candidate for this post was a neutrino, but scientists have not been able to determine the basic nature of this elusive particle.
The existence of dark matter was first proposed as in the 30s, to explain the differences in the speed of rotation of galactic clusters. Subsequently astronomers found that the speed with which rotate around separate star galaxy also fits into the predicted model. Detailed observation showed that the stars that are further away from the center of the galaxy are moving at a much faster rate than predicted on the basis of data on visible matter that makes up the galaxy. It has become apparent that there is a huge amount of invisible “dark” matter, which would be the easiest way to explain the discrepancy.
Scientists have suggested that dark matter can not be seen with a telescope because it does not specifically interact with light and other electromagnetic radiation. In fact, astronomical observations were based on the possibility that the dark matter does not have an electrical charge.
More recently, a number of physicists suggested that dark matter is no electric charge, but there is an electric or magnetic dipole. The only problem is that even these more sophisticated models do not work for Majorana particles. And this is one of the reasons that Ho and Scherrer decided to take a closer look at the dark matter with anapole magnetic moment.
“Although the Majorana fermions are electrically neutral, a fundamental symmetry of nature forbids them to acquire any electromagnetic properties except anapole” – says Ho.
The existence of magnetic anapole was predicted by the Soviet physicist Yakov Zeldovich in 1958. Since then Anapol found in the magnetic structure of the nuclei of atoms of cesium-133 and ytterbium-174.
Particles with a conventional electric and magnetic dipoles interact with the electromagnetic field, even in the steady state. Particles Anopolis – do not react. They have to move to the interaction, and the sooner – the stronger the interaction. As a result, Anapole particles should be much more interactive in the early days of the universe and gradually become less active as the universe expands and cools.
The particles of dark matter Anapole proposed Ho and Scherrer, were annihilated in the early universe, as well as other proposed dark matter particles, and the remaining particles – make up what we call dark matter today. But because dark matter is moving very slowly today, and as Anapole interaction depends on the speed of the movement of matter, these particles could easily stay out of sight of the radar scientists.
We recall not so long ago there was a certain Eric Weinstein, whose theory also intends to turn the traditional understanding (or misunderstanding) of the principles of dark matter.
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Tags: Anapol , Dark Matter , Fermions .
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