当前位置:首页 > tennis > 正文内容

New avenues for thinking about elusive dark matter

admin1周前 (07-29)tennis334
New avenues for thinking about elusive dark matter New avenues for thinking about elusive dark matter tennis

Physicists have been looking for particles that make up dark matter—a form of matter thought to account for approximately 80 per cent of the substance that permeates our galaxy and universe—for nearly four decades.

Named 'dark matter' because it gives off no light, this mysterious substance has been shown repeatedly to influence ordinary matter through its gravity. Scientists know it is out there but do not know what it is.

Caltech's researchers, led by Kathryn Zurek, a professor of theoretical physics, have gone back to the drawing board to think of new ideas. They have been looking into the possibility that dark matter is made up of "hidden sector" particles, which are lighter than particles proposed previously, and could, in theory, be found using small, underground table-top devices. Scientists deviated their search for heavier dark matter candidates called WIMPs (weakly interacting massive particles) using large-scale experiments such as XENON, which is installed underground in a 70,000-gallon tank of water in Italy.

"Dark matter is always flowing through us, even in this room" says Zurek, who first proposed hidden sector particles over a decade ago. “As we move around the center of the galaxy, this steady wind of dark matter mostly goes unnoticed. But we can still take advantage of that source of dark matter, and design new ways to look for rare interactions between the dark matter wind and the detector.”

In a new paper accepted for publication in the journal Physical Review Letters, the physicists outline how the lighter-weight dark matter particles could be detected via a type of quasiparticle known as a magnon.

A quasiparticle is an emergent phenomenon that occurs when a solid behaves as if it contains weakly interacting particles. Magnons are a type of quasiparticle in which electron spins—which act like little magnets—are collectivity excited. In the researchers' idea for a table-top experiment, a magnetic crystalized material would be used to look for signs of excited magnons generated by dark matter.

"If the dark matter particles are lighter than the proton, it becomes very difficult to detect their signal by conventional means," says study author Zhengkang (Kevin) Zhang, a postdoctoral scholar at Caltech.

"But, according to many well-motivated models, especially those involving hidden sectors, the dark matter particles can couple to the spins of the electrons, such that once they strike the material, they will induce spin excitations, or magnons. If we reduce the background noise by cooling the equipment and moving it underground, we could hope to detect magnons generated solely by dark matter and not ordinary matter."

Such an experiment is only theoretical at this point but may eventually take place using small devices housed underground, likely in a mine, where outside influences from other particles, such as those in cosmic rays, can be minimized.

One telltale sign of dark matter detection in the table-top experiments would be changes to the signal that depend on the time of day. This is due to the fact that the magnetic crystals that would be used to detect the dark matter can be anisotropic, meaning that the atoms are naturally arranged in such a way that they tend to interact with the dark matter more strongly when the dark matter comes in from certain directions.

"As Earth moves through the galactic dark matter halo, it feels the dark matter wind blowing from the direction into which the planet is moving. A detector fixed at a certain location on Earth rotates with the planet, so the dark matter wind hits it from different directions at different times of the day, say, sometimes from above, sometimes from the side," says Zhang.

"During the day, for example, you may have a higher detection rate when the dark matter comes from above than from the side. If you saw that, it would be pretty spectacular and a very strong indication that you were seeing dark matter."

The researchers have other ideas about how dark matter may reveal itself, in addition to through magnons. They have proposed that the lighter dark matter particles could be detected via photons as well as with another type of quasiparticle called a phonon, which is caused by vibrations in a crystal lattice.

Preliminary experiments based on photons and phonons are underway at UC Berkeley, where the team was based prior to Zurek joining the Caltech faculty in 2019. The researchers say that the use of these multiple strategies to look for dark matter is crucial because they complement each other and would help confirm each other's results.

"We're looking into new ways to look for dark matter because, given how little we know about dark matter, it's worth considering all the possibilities," says Zhang.

扫描二维码推送至手机访问。

版权声明:本文由甘肃快三发布,如需转载请注明出处。

转载请注明出处:http://garicomm.com/post/552.html

相关文章

Google bans 11 apps for spreading malware

Google bans 11 apps for spreading malware

Google has dropped 11 apps from its Play Store that were associated with Joke...

Are symptom-monitoring apps effective in tracking new COVID-19 cases?

Are symptom-monitoring apps effective in tracking new COVID-19 cases?

A medic collects a sample of a woman for COVID-19 test at NDMC Child welfare centre, in Saroji...

Dolphins acquire new skills from peers through social learning

Dolphins acquire new skills from peers through social learning

A dolphin at Shark Bay | Shark Bay Dolphins Dolphins learn new skills fro...

Elephants pick right or left side trunk preference at early age: Researchers

Elephants pick right or left side trunk preference at early age: Researchers

File photo of elephants playing at the Jim Corbett Natural Park | Shutterstock...

Bed bugs modify microbial diversity of homes they infest

Bed bugs modify microbial diversity of homes they infest

New study says that bed bugs can modify microbial communities in homes they i...

发表评论

访客

◎欢迎参与讨论,请在这里发表您的看法、交流您的观点。