China’s dark matter space probe detects tantalizing signal

A long-standing challenge in physics has been finding evidence for dark matter, the stuff presumed to make up a substantial chunk of the mass of the universe. Its existence seems to be responsible for the structure of the universe and the formation and evolution of galaxies. But physicists have yet to observe this mysterious material. Results reported today by a China-led space science mission provide a tantalizing hint for dark matter. Perhaps more significantly, the first observational data produced by China’s first mission dedicated to astrophysics shows that the country is set to become a force in space science, says David Spergel, an astrophysicist at Princeton University. China is now “making significant contributions to astrophysics and space science,” he says.

Physicists have inferred the existence of dark matter from its gravitational effect on visible matter. China’s Dark Matter Particle Explorer (DAMPE) was designed to try to fill that gap, by looking for an indirect decay signal of a hypothetical dark matter candidate called weakly interacting massive particles (WIMPs). Researchers launched the spacecraft from the Jiuquan Satellite Launch Center in the Gobi Desert, about 1600 kilometers west of Beijing, in December 2015. Its primary instrument—a stack of thin, crisscrossed detector strips—is tuned to observe the incoming direction, energy, and electric charge of the particles that make up cosmic rays, particularly electrons and positrons, the antimatter counterparts of electrons. Cosmic rays emanate from conventional astrophysical objects, like exploding supernovae in the galaxy. But if dark matter consists of WIMPs, these would occasionally annihilate each other and create electron-positron pairs, which might be detected as an excess over the expected abundance of particles from conventional objects.

In its first 530 days of scientific observations, DAMPE detected 1.5 million cosmic ray electrons and positrons above a certain energy threshold. When researchers plot of the number of particles against their energy, they’d expect to see a smooth curve. But previous experiments have hinted at an anomalous break in the curve. Now, DAMPE has confirmed that deviation. The DAMPE results appear online today in Nature. More data will be needed to confirm what DAMPE is possibly seeing. But there is good news on that front.

Ruoci Ning

기다림 (정호진)

시간아 가라 가라

더 빨리

할일이 너무 많아

할 생각이 너무 많아

고민이 너무 넘쳐나

빨리 와서 나랑 안겨라

혼자하기 어려워

고생하다 보면 숨차서

같이 있으면 더 쉬워

니가 내 곁에 있어서

빈 공간을 채우고 싶어

넓은 들판을 넘어서

내 머리 속을 비우고 싶어

푸른 하늘 구름 넘어서

시간아 가라 가라

더 빨리

The Waiting

(Hojin Chung)

Time please go by

Faster

Have too much to do

Have too much to think about

Have too much worries

Just come and embrace me

Hard to do alone

Hardships are tiring

Doing it together is easier

Because you are beside me

I want to fill the emptiness inside

Like the wide green field

Yet I want to empty my head

Like the clear sky

Time please go by

Faster

Tokyo Tower (2014 Japan)

by

K. Song