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Tag archives: gravitational waves

Waking up to a gravitational wave


By Hamish Johnston

Yesterday we announced the winner of the Physics World 2016 Breakthrough of the Year, which went to the LIGO Scientific Collaboration for its revolutionary, first ever direct observations of gravitational waves. I caught up with six LIGO scientists in the above video Hangout and asked them what it was like when they first realized that they had detected gravitational waves emanating from two coalescing black holes 1.3 billion light-years away.

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Chasing gravitational waves in song, physicists on Broadway, the ‘impossible space engine’ returns

 

By Hamish Johnston

These days anyone making a major breakthrough in physics is expected to follow-up with a cheesy music video. So give it up for The Mavericks and “Chasing the Waves”, which chronicles the quest to detect gravitational waves – which culminated in LIGO’s success earlier this year. I don’t much about this video, but it seems to have been filmed at the University of Glasgow, which is part of the LIGO collaboration.

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The beauty of gravitational waves

Painting by Penelope Cowley depicting gravitational waves is being unveiled at Cardiff University's school of physics and astronomy on 25 November 2016

Science meets art – this painting by Penelope Cowley will be unveiled at Cardiff University’s school of physics and astronomy on 25 November.

By Matin Durrani

A new painting by Welsh artist Penelope Cowley is the latest attempt to bring art and science together. Set to be unveiled on Friday 25 November at Cardiff University’s school of physics and astronomy, the 1.2 × 1.5 m picture was inspired by the recent detection of gravitational waves by the LIGO collaboration.

According to the university, the oil painting “combines a visualization of data taken from the equipment used to detect the first gravitational waves…with an imagination of some of the celestial bodies that are responsible for creating these waves, such as binary black holes and neutron stars”.

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Cosmic messengers and the rise of neutrino astronomy

Marek Kowalski talking at the Neutrino 2016 conference

Cool operator: Marek Kowalski talking about IceCube at the Neutrino 2016 conference. (Courtesy: Tushna Commissariat)

By Tushna Commissariat at the Royal Geographical Society in London

“There are still many things to be studied in neutrinos,” said 2015 Nobel laureate Takaaki Kajita at the first talk of the Neutrino 2016 conference that began in London today. I couldn’t help but notice that his statement rang very true, as the day’s talks touched on everything from high-energy neutrinos to dark-matter searches to monitoring nuclear reactors. This year, more than 700 physicists from all over the world are attending the week-long conference, which is taking place at the historic Royal Geographical Society in London.

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George Smoot on mapping the universe with gravity

Measuring the universe: George Smoot enthuses about gravitational waves

Measuring the universe: George Smoot enthuses about gravitational waves.

By Hamish Johnston at the Lindau Nobel Laureate Meeting in Germany

Yesterday I was in a fantastic session with George Smoot, who shared the 2006 Nobel Prize for Physics for discovering the anisotropy in the cosmic microwave background. He will be speaking today at the 66th Lindau Nobel Laureate Meeting about another important astronomical discovery, the first direct detection of gravitational waves that was made by LIGO in September 2015. Waves that were created by the merger of two unexpectedly large black holes.

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Second wave: all about LIGO, black holes, gravitational ripples and more

 

By Tushna Commissariat

What an exciting week it has been, as the LIGO and Virgo collaborations announced that they have definitely detected a second gravitational wave event using the Advanced Laser Interferometer Gravitational-wave Observatory (aLIGO) in the US.  These waves made their way into aLIGO early on Boxing Day last year (in fact it was still very late on Christmas Day in the US states where the twin detectors are located), a mere three months after the first gravitational-wave event was detected on 14 September 2015.

This event once again involved the collision and merger of two stellar-mass black holes, and since the “Boxing Day binary” is still on my mind, this week’s Red Folder is a collection of all the lovely images, videos, infographics and learning tools that have emerged since Wednesday.

LIGO physicist and comic artist Nutsinee Kijbunchoo has drawn a cartoon showing that while the researchers were excited about the swift second wave, they were a bit spoilt by the first, which was loud and clear – and could be seen by naked eye in the data. The black holes involved in the latest wave were smaller and a bit further away, meaning the signal was fainter, but actually lasted for longer in the detectors.

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LIGO paints a clearer picture of its merging black holes

Illustration of two black holes spiralling into each other to create a larger black hole (Courtesy: Caltech/MIT/LIGO Lab)

Illustration of two black holes spiralling into each other to create a larger black hole. (Courtesy: Caltech/MIT/LIGO Lab)

By Hamish Johnston

Physicists working on the LIGO gravitational-wave detectors have released more information about the merging black holes that they announced the discovery of earlier this year. Dubbed GW150914, we now know that the gravitational wave was created by the merger of one black hole that was 36 times as massive as the Sun with a smaller black hole that weighed in at 29 solar masses. The result of the merger was a black hole at 62 solar masses and a spin angular momentum of 0.67, where 1.0 is the maximum value of spin a black hole can have.

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Sea monsters at LIGO, how to become a ‘thought leader’ and why not string theory?

"The art of naming glitches" by Antimatter Webcomic (click to enlarge).

“The art of naming glitches” by Nutsinee Kijbunchoo/Antimatter Webcomics (click to enlarge).

By Hamish Johnston

Have you ever wondered how the LIGO collaboration managed to tease out the tiny signal from gravitational wave GW150914 from all the background noise in its kilometre-sized detectors? Well you’re in luck because experts from the LIGO detector characterization group have written a lively piece on the CQG+ blog called “How do we know LIGO detected gravitational waves?”.

It’s packed full of fun facts; for example, did you know that detecting GW150914 is roughly the same as measuring a change in distance the thickness of a human hair between Earth and Alpha Centauri, the closest star to Earth? But be warned, the article is also full of technical terms such as “whistles”, “blips”, “koi fish” and even “Fringey the sea monster”. These are illustrated in the above graphic by LIGO physicist and artist Nutsinee Kijbunchoo.

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LISA Pathfinder opens the door to gravitational-wave detection in space

Flying high: LISA Pathfinder has overcome a major hurdle (Courtesy: ESA)

Flying high: LISA Pathfinder has overcome a major hurdle. (Courtesy: ESA)

By Hamish Johnston

2016 is shaping up to be a bumper year for physicists trying to detect gravitational waves. In February the LIGO collaboration announced the first ever direct detection of gravitational waves using two kilometre-sized detectors in the US.

Now, it looks like an even bigger detector will get permission to launch. Researchers working on the LISA Pathfinder space mission have just announced that they were able to isolate a 2 kg test mass at a special “Lagrangian point” between the Earth and the Sun. This is important because the planned LISA gravitational-wave observatory will use test masses located at three points in space (each separated by about one million kilometres) as the basis for a huge detector.

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Kavli prize for gravitational-wave pioneers

Winners of the 2016 Kavli Prize in Astrophysics

Gravitational-wave pioneers: (l to r) Ronald Drever, Kip Thorne and Rainer Weiss.

By Michael Banks

It’s been a great month for the people behind the Advanced Laser Interferometer Gravitational-wave Observatory (aLIGO), which recently discovered gravitational waves.

In early May, Ron Drever, Kip Thorne and Rainer Weiss – who co-founded LIGO – together bagged a cool $1m share of a special $3m Breakthrough Prize together with more than 1000 LIGO scientists, who shared the remaining $2m.

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