Published On: Sun, Nov 16th, 2014

Mission to discover hundreds of black holes could unlock secrets of the universe

pulsar2013 NASA BLACK HOLE: Merging black holes ripple space and time in this artist's concept. Pulsar-timing arrays -- networks of the pulsing cores of dead stars -- are one strategy for detecting these ripples,   or gravitational waves,   thought to be generated when two supermassive black holes merge into one. Image Credit: Swinburne Astronomy Productions

A team of Cardiff University researchers have made a breakthrough in helping scientists discover hundreds of black holes throughout the universe.

When two detectors are switched on in the US next year, the Cardiff team hope their research will help scientists pick up the faint ripples of black hole collisions millions of years ago, known as gravitational waves.

Black holes cannot be seen, but scientists hope the revamped detectors – which act like giant microphones – will find remnants of black hole collisions.

Led by Dr Mark Hannam from the School of Physics and Astronomy, the researchers have built a theoretical model which aims to predict all potential gravitational-wave signals that might be found by the detectors.

The Cardiff researchers hope it will act as a ‘spotters’ guide’ to help scientists working with the giant LIGO detectors recognise the right waveforms and reveal the secrets of how black holes orbit into each other and collide.

Dr Hannam said: “The rapid spinning of black holes will cause the orbits to wobble, just like the last wobbles of a spinning top before it falls over. These wobbles can make the black holes trace out wild paths around each other, leading to extremely complicated gravitational-wave signals. Our model aims to predict this behaviour and help scientists find the signals in the detector data.”

147929main_SpeedyFlaresLG NASA BLACK HOLE

The Cardiff team, which includes postdoctoral researchers, PhD students, and collaborators from universities in Europe and the United States, will work with scientists across the world as they attempt to unravel the origins of the Universe.

Dr Hannam added: “Sometimes the orbits of these spinning black holes look completely tangled up, like a ball of string. But if you imagine whirling around with the black holes, then it all looks much clearer, and we can write down equations to describe what is happening. It’s like watching a kid on a high-speed spinning amusement park ride, apparently waving their hands around. From the side lines, it’s impossible to tell what they’re doing. But if you sit next to them, they might be sitting perfectly still, just giving you the thumbs up.”

The new model has been programmed into the computer codes that LIGO scientists all over the world are preparing to use to search for black-hole mergers when the detectors switch on. But there is still more work to do.

“So far we’ve only included these precession effects while the black holes spiral towards each other, ” said Dr Hannam. “We still need to work our exactly what the spins do when the black holes collide.”

For that they need to perform large computer simulations to solve Einstein’s equations for the moments before and after the collision. They’ll need to produce many simulations to capture enough combinations of black-hole masses and spin directions to understand the overall behaviour of these complicated systems.

Dr Hannam is optimistic. “For years we were stumped on how to untangle the black-hole motion. Now that we’ve solved that, we know what to do next.”

Time is running out. Once the detectors switch on, it will only be a matter of time before the first gravitational-wave detections are made. The calculations that Dr Hannam and his colleagues are producing have to be ready in time to make the most of them.

NASA BLACK HOLE : This artist's concept illustrates a supermassive black hole with millions to billions times the mass of our sun. Supermassive black holes are enormously dense objects buried at the hearts of galaxies. (Smaller black holes also exist throughout galaxies.) In this illustration,   the supermassive black hole at the center is surrounded by matter flowing onto the black hole in what is termed an accretion disk. This disk forms as the dust and gas in the galaxy falls onto the hole,   attracted by its gravity.  Also shown is an outflowing jet of energetic particles,   believed to be powered by the black hole's spin. The regions near black holes contain compact sources of high energy X-ray radiation thought,   in some scenarios,   to originate from the base of these jets. This high energy X-radiation lights up the disk,   which reflects it,   making the disk a source of X-rays. The reflected light enables astronomers to see how fast matter is swirling in the inner region of the disk,   and ultimately to measure the black hole's spin rate.

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