Fourth Industrial Revolution

Could this help us to unravel the mysteries of the universe?

Adelie penguins walk along ice at Cape Denison, Commonwealth Bay, East Antarctica, in this picture taken December 31, 2009. Antarctica pact partners have set up a new protected geological site on the frozen continent to preserve rare minerals that could shine a spotlight on the region's history and evolution over millions of years. At a meeting in Brazil in May 2014, the signatories to the Antarctic Treaty designated the Larsemann Hills region of the continent as an Antarctic Specially Protected Area. Picture taken December 31, 2009.

The IceCube looks for neutrinos beneath the surface of Antarctic ice, and ultimately led scientists to a quasar 9.1bn light years from Earth. Image: REUTERS/Pauline Askin

Sergei Gulyaev
Professor of Astronomy, Auckland University of Technology
Ivy Shih
Editor, The Conversation
Share:
Our Impact
What's the World Economic Forum doing to accelerate action on Fourth Industrial Revolution?
The Big Picture
Explore and monitor how Fourth Industrial Revolution is affecting economies, industries and global issues
A hand holding a looking glass by a lake
Crowdsource Innovation
Get involved with our crowdsourced digital platform to deliver impact at scale
Stay up to date:

Fourth Industrial Revolution

In 2012, a tiny flash of light was detected deep beneath the Antarctic ice. A burst of neutrinos was responsible, and the flash of light was their calling card.

It might not sound momentous, but the flash could give us tantalising insights into one of the most energetic objects in the distant universe.

The light was triggered by the universe’s most elusive particles when they made contact with a remarkable detector, appropriately called IceCube, which was built for the very purpose of capturing rare events such as this.

The team of international researchers now suspect the event may have originated from a quasar, which is the active nucleus of a galaxy billions of light-years away.

The flash also potentially opens up a new era of neutrino astrophysics and may help unravel the mystery of neutrino production in the universe.

The antisocial particle that came in from the cold

Neutrinos are elementary particles and one of the smallest building blocks of the universe. Despite being one of the most abundant and energetic particles, neutrinos have a reputation of being notoriously hard to detect.

This is because they very rarely interact with normal matter. In fact, billions of them pass through your body every minute without even causing a tickle.

So how do you find such an antisocial particle?

It might not look it from the frosty surface of Antarctica, but Ice Cube is one of the world’s largest telescopes, and the largest for detecting neutrinos.

IceCube occupies a cubic kilometre of clear ice, which provides the best medium for thousands of sensors to capture that elusive burst of light created when a high energy neutrino collides with an ice particle.

 A diagram of the IceCube South Pole neutrino observatory in the Amundsen-Scott South Pole Station, Antarctica.
Image: IceCube Collaboration

Although the probability of a collision is minuscule, there are so many neutrinos that pass through the detector that eventually some will interact with the ice.

The trick then is to determine where the neutrinos originated. Neutrinos are produced by the nuclear reactions going on at the centre of stars and in other highly energetic cosmic processes.

So when trying to find origin of the 2012 neutrino burst, Professor Sergei Gulyaev, the director of Auckland University of Technology’s Institute for Radio Astronomy and Space Research told The Conversation that there was no shortage of candidates. The sky was literally the limit.

“Out of millions of astronomical objects, which one was responsible?”

Nucleus of a galaxy

A network of New Zealand, Australian and African radio telescopes searched the skies for what might have triggered the 2012 flash.

But one candidate stood out. Radio astronomers were able to create an image of a distant object that appeared to change dramatically after the neutrino burst was registered in South Pole.

From this, they decided that the most likely source of the neutrinos was a quasar, called PKS 1424-418, located 9.1 billion light years away – nearly at the edge of the visible universe.

A quasar is the active nucleus of a primordial galaxy with a supermassive black hole at its core.

“We knew before that huge fluxes of very energetic particles came from space. We call them ‘cosmic rays’. Neutrinos are part of them. But we had no idea which astronomical objects are responsible for this.”

Gulyaev emphasised that they had to be cautious before drawing any conclusions about the source of the neutrinos.

“We were very careful, but combining radio astronomical and gamma-ray observations made by NASA’s Fermi gamma-ray space telescope, we now know where or what it is. Given the huge increase in energy, shape change and activity, we are 95% sure that a quasar was responsible for the event registered by IceCube.”

Gulyaev added that this particular quasar was active while the universe was very young.

“Quasars are like dinosaurs. They became extinct a long time ago,” said Gulyaev. “But because astronomy is like a time machine, we were able to study this quasar.”

The study may also open a new window into the distant universe. Whereas most astronomy is conducted by studying electromagnetic radiation, such as light or radio waves, these can be obscured or distorted as they travel through space.

But because neutrinos pass through most matter, and aren’t influenced by magnetic fields, they can pass through vast stretches of the cosmos uninterrupted. If we can detect them reliably, we might be able to observe things we can’t normally see.

An exciting problem

Professor Ron Ekers, an astrophysicist from CSIRO, said the study presents tantalising possibilities of an extragalatic origin of the high energy neutrino burst.

However, the true test of time will be if the model can eventually predict future detections alongside more precise measurements of neutrino positions that would be possible in the future.

Ekers said that although the model presents a possible origin, a crucial step would be to increase the level of accuracy in neutrino detection instruments to more precisely pinpoint and narrow down possible sources.

“Current position errors for these neutrinos are quite large and there are many possible objects which could be the source.”

Ekers added that both IceCube and the Mediterranean Neutrino Array (KM3NeT) have future plans to greatly improve positional accuracy to fulfil that need.

“Finding out where the high energy neutrinos come from is one of the most exciting problems in astrophysics today. Now we have a possible identification we desperately need to improve the directional accuracy of the neutrino detections. ”

Don't miss any update on this topic

Create a free account and access your personalized content collection with our latest publications and analyses.

Sign up for free

License and Republishing

World Economic Forum articles may be republished in accordance with the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License, and in accordance with our Terms of Use.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Share:
World Economic Forum logo
Global Agenda

The Agenda Weekly

A weekly update of the most important issues driving the global agenda

Subscribe today

You can unsubscribe at any time using the link in our emails. For more details, review our privacy policy.

How the role of telecoms is evolving in the Middle East

Bart Valkhof and Omar Adi

February 16, 2024

About Us

Events

Media

Partners & Members

  • Join Us

Language Editions

Privacy Policy & Terms of Service

© 2024 World Economic Forum