A new candidate for dark matter and a way to detect it


A simulation of the massive structure of deep space with filaments of dark matter in blue and locations of galaxy development in yellow. Dark matter cannot yet be discovered straight. UC Davis physicists have actually proposed a new design to discuss it. Credit: Zarija Lukic/Lawrence Berkeley National Lab

2 theoretical physicists at the University of California, Davis have a new candidate for dark matter, and a possible way to detect it. They provided their work June 6 at the Planck 2019 conference in Granada, Spain and it has actually been sent for publication.


Dark matter is believed to comprise simply over a quarter of our universe, with the majority of the rest being even-more mystical dark energy. It cannot be seen straight, however dark matter’s existence can be discovered due to the fact that its gravity identifies the shape of remote galaxies and other items.

Lots of physicists think that dark matter is comprised of some particle yet to be found. For a long time, the preferred candidate has actually been the Weakly Communicating Enormous Particle or PUSHOVER. However in spite of years of effort, Pansies have up until now disappointed up in experiments developed to detect them.

“We still don’t know what dark matter is,” stated John Terning, teacher of physics at UC Davis and coauthor on the paper. “The primary candidate for a long time was the WIMP, but it looks like that’s almost completely ruled out.”

An option to the PUSHOVER design of dark matter calls for a kind of “dark electromagnetism” consisting of “dark photons” and other particles. Dark photons would have some weak coupling with “regular” photons.

In their new paper, Terning and postdoctoral scientist Christopher Verhaaren include a twist to this concept: a dark magnetic “monopole” that would communicate with the dark photon.

In the macroscopic world, magnets constantly have 2 poles, north and south. A monopole is a particle that imitates one end of a magnet. Monopoles are anticipated by quantum theory, however have actually never ever been observed in an experiment. The researchers recommend that dark monopoles would communicate with dark photons and dark electrons in the very same way that theory forecasts electrons and photons communicate with monopoles.

A new way to detect dark matter

Which suggests a way to detect these dark particles. The physicist Paul Dirac anticipated that an electron relocating a circle near a monopole would get a modification of stage in its wave function. Since electrons exist as both particles and waves in quantum theory, the very same electron might hand down either side of the monopole and as a result be somewhat out of stage on the other side.

This disturbance pattern, called the Aharonov-Bohm impact, implies that an electron circulating a electromagnetic field is affected by it, even if it does not go through the field itself.

Terning and Verhaaren argue that you might detect a dark monopole due to the fact that of the way it moves the stage of electrons as they go by.

“This is a new type of dark matter but it comes with a new way to look for it as well,” Terning stated.

Electron beams are fairly simple to come over: electron microscopic lens were utilized to show the Aharonov-Bohm impact in the 1960s, and electron beam technology has actually enhanced with time, Terning kept in mind.

In Theory, dark matter particles are streaming through all of us the time. To be noticeable in Terning and Verhaaren’s design, the monopoles would have to be thrilled by the Sun. Then they would take about a month to reach Earth, taking a trip at about a thousandth of the speed of light.

On the other hand, the anticipated stage shift is incredibly little—smaller sized than that required to detect gravity waves, for example. Nevertheless, Terning kept in mind that when the LIGO gravity wave experiment was very first proposed, the technology to make it work did not exist —rather, technology captured up with time.


NA64 hunts the mystical dark photon


More details:
Discovering Dark Matter with Aharonov-Bohm, arXiv: 1906.00014 [hep-ph] arxiv.org/abs/1906.00014

Citation:
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