探花直播big question
Cambridge team joins ALPHA hunt for dark matter
It’s considered a ‘table-top experiment’, using apparatus that fits into a university lab, but the scale of its ambition couldn’t be much bigger – to expand our understanding of the Universe’s fundamental structure.
A team of Cambridge 探花直播 scientists are working with colleagues from around the world on the new (ALPHA) project to identify the composition of dark matter, the mysterious and invisible material believed to make up 85 per cent of all the matter in the Universe.
探花直播newly funded international experiment will use a powerful superconducting magnet to search for axion particles, one of the most-favoured candidates for dark matter. Axions were named after a washing powder, because the idea washes clean some fine-tuning problems in the Standard Model of particle physics.
“We have the potential to make a groundbreaking discovery,” says Hiranya Peiris, Professor of Astrophysics (1909) at the Institute of Astronomy, and a founding member of the ALPHA collaboration. “ 探花直播fact that we only understand 5% of the matter that makes up the Universe, all the stars and the galaxies, means there’s a huge hole in our fundamental understanding.
“So much of the dark Universe is still a huge mystery, but dark matter is something we can actively experimentally look for in the laboratory, and that’s what makes this project so exciting.”
To do this, a metamaterial-inspired resonator-based experiment will be built, and sited at Yale, in an existing 16 Tesla magnet. Compared to the enormous underground cavern sites needed to test for weakly interacting massive particles (WIMPs), another compelling candidate for dark matter, the ALPHA equipment needed to test for axions will be tiny. A ‘tuneable’ array of wires aims to allow the resonator to detect the axion – which is coupled to a photon – as an energy field, rather than a particle.
“Even when you amplify the tiny electric current that signals axions, it’s still really small,” says Professor Peiris. “So you need very sensitive equipment to measure it. And that’s why being awarded this funding – to build the full-scale experiment, not just a prototype – is such an amazing opportunity. What we’re trying to understand here is the nature of the dark matter we can see through its gravitational effects in cosmological nature – we know it’s there, but we don’t know what it is.”
"So much of the dark Universe is still a huge mystery, but dark matter is something we can actively experimentally look for in the laboratory, and that’s what makes this project so exciting."
ALPHA is a collaboration between 12 institutions: Yale 探花直播 (which is hosting the experiment); Arizona State 探花直播; 探花直播 of California, Berkeley; 探花直播 of Cambridge; 探花直播 of Colorado at Boulder; 探花直播 of Iceland; ITMO 探花直播; Johns Hopkins 探花直播; MIT; Oak Ridge National Laboratory; Stockholm 探花直播, and Wellesley College.
It is funded by the and the , which along with the and the have partnered to fund 11 innovative table-top experiments, many of which will explore realms of physics typically probed by large-scale facilities. 探花直播foundations have pledged a total of £24m ($30m) over five years.
In Cambridge, scientists from the Cavendish Laboratory and the Institute of Astronomy will support the project by providing R&D testing for the superconducting resonator components.
Dr Siddharth Saxena, superconductivity specialist at the Cavendish Laboratory, said: “Our Cambridge team will support the design and development of the detection systems to make this table-top experiment cutting edge in its resolution and efficiency.”
Professor Mete Atatüre, Head of the Cavendish Laboratory, said: “By pooling their resources and expertise, the various foundations have boosted the impact of their support and are able to collectively fund more table-top projects that could push the frontiers of fundamental physics. This development is very timely for Cambridge, given the current interest in .”
And Professor Peiris believes the 探花直播’s role as a founding partner of the ALPHA project, along with other UK initiatives in this field – including ambitions to expand the Boulby Underground Laboratory in North Yorkshire – could help position the country at the heart of dark matter detection.
“ 探花直播UK could become a leader in dark matter experimentation,” she said. “We are heavily involved in international facilities, where we do a lot of work on experiments happening in other countries, but it would be really nice to do more of those experiments here.
“Dark matter is a huge puzzle to solve, and for me that’s the motivation. Any time nature is telling us ‘look here, there’s a huge mystery to solve’, scientists have picked at it and have made big discoveries that have changed our thinking.
“But there’s also the experimental side of it, and developing this type of state-of-the-art equipment which can have different applications. Quantum technology is making great leaps forward and will be crucial in solving some of the big technological challenges for humanity.”
探花直播text in this work is licensed under a .
