gravitational wave
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enBlack holes exist!
https://plus.maths.org/content/black-holes-do-exist
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Finally we can be sure — black holes, those gravitational monsters that gobble up everything that gets too close to them, do exist. </div>
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<p>Finally we can be sure — black holes, those gravitational monsters that gobble up everything that gets too close to them, do exist. The crucial piece of evidence arrived yesterday, when <a href="https://plus.maths.org/content/spacetime-does-ripple">physicists announced</a> they had detected ripples in spacetime called <em>gravitational waves</em> for the first time. "It's the greatest discovery in experimental gravitational physics of the last hundred years," says <a href="http://www.damtp.cam.ac.uk/people/p.figueras/">Pau Figueras</a>, a theoretical physicist as the University of Cambridge.<p><a href="https://plus.maths.org/content/black-holes-do-exist" target="_blank">read more</a></p>https://plus.maths.org/content/black-holes-do-exist#commentsblack holegeneral relativitygravitational wavegravityFri, 12 Feb 2016 12:41:36 +0000mf3446526 at https://plus.maths.org/contentSpacetime does ripple
https://plus.maths.org/content/spacetime-does-ripple
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<p>Physicists have finally detected the gravitational waves they have been chasing for nearly 100 years.</p>
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<p>"Ladies and gentlemen, we have detected gravitational waves!" David Reitze's announcement this afternoon was greeted by cheers and applause across the globe, including the common room upstairs from our office where we watched the press conference with physicists and mathematicians from the University of Cambridge.<p><a href="https://plus.maths.org/content/spacetime-does-ripple" target="_blank">read more</a></p>https://plus.maths.org/content/spacetime-does-ripple#commentsblack holegravitational wavegravitational wave detectorrelativityThu, 11 Feb 2016 15:24:31 +0000mf3446525 at https://plus.maths.org/contentHas LIGO detected gravitational waves?
https://plus.maths.org/content/has-ligo-detected-gravitational-waves
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Having spent the summer of 1993 on a student placement in a gravitational wave lab, I am finding it very hard to stay calm about the <a href="http://www.nature.com/news/gravitational-wave-rumours-in-overdrive-1.19161">rumours that we may have finally detected gravitational waves</a>. Whispers from a few months ago have built to excited headlines this week that <a href="https://ligo.caltech.edu">LIGO</a> may have detected gravitational waves produced by the merger of two black holes.
</p><p><a href="https://plus.maths.org/content/has-ligo-detected-gravitational-waves" target="_blank">read more</a></p>https://plus.maths.org/content/has-ligo-detected-gravitational-waves#commentsblack holegravitational wavegravitational wave detectorWed, 13 Jan 2016 13:25:48 +0000Rachel6517 at https://plus.maths.org/contentCelebrating general relativity
https://plus.maths.org/content/celebrating-general-relativity
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<p>A hundred years ago, on 25 November 1915, Einstein first presented his general theory of relativity. We explore this famous theory and what it says about the world we live in.</p>
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<div style="float: left; max-width: 550px;"><p>A hundred years ago, on 25 November 1915, Einstein
presented his general theory of relativity to the world. But what exactly is this famous theory and what does it say about the world we live in? To celebrate the centenary of general relativity we bring you a collection of articles, videos and podcasts exploring the theory, Einstein's struggle to find it, and some interesting consequences.</p><p><a href="https://plus.maths.org/content/celebrating-general-relativity" target="_blank">read more</a></p>https://plus.maths.org/content/celebrating-general-relativity#commentsblack holeEinsteinFP-carouselgeneral relativitygravitational wavehistory of mathematicsrelativityMon, 16 Nov 2015 13:26:20 +0000mf3446456 at https://plus.maths.org/contentCosmology breakthrough raises new questions
https://plus.maths.org/content/cosmology-breakthrough-raises-new-questions
<p>Yesterday cosmologists at the University of Cambridge delivered their verdict on a major breakthrough that rocked science this week: the announcement of the <a href="http://bicepkeck.org/">BICEP2</a> project of direct evidence for an inflationary theory of the Universe and the existence of gravity waves (see <a href="https://plus.maths.org/content/first-swirling-glimpse-inflation-and-gravity-waves">here</a> for our report).<p><a href="https://plus.maths.org/content/cosmology-breakthrough-raises-new-questions" target="_blank">read more</a></p>https://plus.maths.org/content/cosmology-breakthrough-raises-new-questions#commentscosmological inflationcosmologygravitational wavetheory of inflationThu, 20 Mar 2014 11:13:24 +0000mf3446067 at https://plus.maths.org/contentA first swirling glimpse of inflation and gravity waves
https://plus.maths.org/content/first-swirling-glimpse-inflation-and-gravity-waves
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<p>Data from BICEP2 gathered in the South Pole reveals swirls in the CMB, the first image of gravitational waves and evidence for inflation.</p>
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As we sat in a roomful of eager astronomers, cosmologists and theoretical physicists today, while they tried repeatedly and unsuccessfully to connect to a live webcast of what is being called by some "the discovery of the century" , we began to suspect that it might well be easier to detect gravitational waves from the early Universe than a livefeed from Harvard.
</p><p><a href="https://plus.maths.org/content/first-swirling-glimpse-inflation-and-gravity-waves" target="_blank">read more</a></p>https://plus.maths.org/content/first-swirling-glimpse-inflation-and-gravity-waves#commentscosmic microwave background radiationcosmologygravitational waveinflationMon, 17 Mar 2014 18:48:32 +0000Rachel6064 at https://plus.maths.org/contentA matter of gravity
https://plus.maths.org/content/matter-gravity
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<p>Snowboarders are vulnerable to gravity. Image: <a href="http://commons.wikimedia.org/wiki/File:Snowboarder_in_halfpipe.jpg">Picswiss.ch</a>.</p><p><a href="https://plus.maths.org/content/matter-gravity" target="_blank">read more</a></p>https://plus.maths.org/content/matter-gravity#commentsgeneral relativitygravitational wavegravitational wave detectorgravityinverse square lawspecial relativityThu, 27 Feb 2014 15:58:39 +0000mf3446051 at https://plus.maths.org/contentWhen black holes collide
https://plus.maths.org/content/hear-black-holes-collide
<p>You're unlikely to ever run into a black hole, but here's what it "looks" and "sounds" like when two black holes run into each other. The movie below, produced by <a href="http://physics.princeton.edu/~fpretori/">Frans Pretorius</a> at Princeton University, shows a simulation of the gravitational waves generated when two black holes collide and form a third. Gravitational waves are ripples in the fabric of spacetime, resulting from events involving massive objects which distort spacetime. The waves were predicted by Einstein's theory of gravity.<p><a href="https://plus.maths.org/content/hear-black-holes-collide" target="_blank">read more</a></p>https://plus.maths.org/content/hear-black-holes-collide#commentsblack holegravitational wavegravityWed, 03 Nov 2010 16:42:52 +0000mf3445348 at https://plus.maths.org/contentHow does gravity work?
https://plus.maths.org/content/how-does-gravity-work
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And what are gravitational waves? </div>
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<div class="pub_date">29/09/2009</div>
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<p>B.S. Sathyaprakash</p><p><a href="https://plus.maths.org/content/how-does-gravity-work" target="_blank">read more</a></p>https://plus.maths.org/content/how-does-gravity-work#commentsastronomyblack holecosmologyEinsteingeneral relativitygravitational wavegravitational wave detectorgravityinternational year of astronomy 2009Newtonspecial relativityMon, 28 Sep 2009 23:00:00 +0000plusadmin2827 at https://plus.maths.org/contentSqueeze me, stretch me
https://plus.maths.org/content/squeeze-me-stretch-me
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Anita Barnes </div>
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Did you know that every instant, gravity waves from outer space are stretching and squeezing you - and everyone and everything else in the universe? Learning more about this mysterious radiation will help us to probe the structure and origins of the universe, explains <b>Anita Barnes</b>. </div>
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<div class="pub_date">March 2004</div>
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<p><i>At this very moment, disturbances from outer space are stretching and squeezing you. Knowing exactly when and by how much you are squashed or stretched will enable humans to learn much more about our universe, perhaps even telling us more about the Big Bang, or shedding light on the mystical "dark matter" that is posited to exist in huge quantities throughout the universe.</i></p>
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https://plus.maths.org/content/faster-falling-bullet
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Scientists have for the first time measured the speed of gravity and tested Einstein's assumption - or have they? </div>
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<div class="pub_date">07/03/2003</div>
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<p>The idea that gravity has a speed seems strange - ever since Newton's day it has been assumed that the gravitational force of an object is felt instantaneously.<p><a href="https://plus.maths.org/content/faster-falling-bullet" target="_blank">read more</a></p>https://plus.maths.org/content/faster-falling-bullet#commentscosmologygeneral relativitygravitational lensinggravitational wavegravityNewtonian mechanicsrelativityFri, 07 Mar 2003 00:00:00 +0000plusadmin2728 at https://plus.maths.org/contentCatching waves with Kip Thorne
https://plus.maths.org/content/catching-waves-kip-thorne
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The Plus Team </div>
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What happens when one black hole meets another? <b>Professor Kip Thorne</b> shows us how to eavesdrop on these cosmic events by watching for telltale gravitational waves. </div>
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<div class="pub_date">Jan 2002</div>
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<p><em>Kip Thorne has been at the forefront of black hole cosmology since the early 1960s, and currently heads one of the world's leading groups working in relativistic astrophysics. An important emphasis of his research is on black holes and gravitational waves, and developing the mathematics necessary to analyse these objects.</em></p>
<p><em>Professor Thorne gave a talk on "Warping Spacetime" and Rachel Thomas from the <i>Plus</i> team went along and spoke with him about it afterwards.</em><br clear="all" /></p><p><a href="https://plus.maths.org/content/catching-waves-kip-thorne" target="_blank">read more</a></p>https://plus.maths.org/content/catching-waves-kip-thorne#comments18Big Bangblack holecosmic microwave background radiationcurvature of spacegravitational wavegravitational wave detectorgravityinterferencelaser interferometrySchwarzchild singularitySat, 01 Dec 2001 00:00:00 +0000plusadmin2199 at https://plus.maths.org/content