Author Topic: The dance of spacetime and the music of the spheres  (Read 852 times)

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The dance of spacetime and the music of the spheres
« on: February 14, 2016, 11:17:28 AM »
Einstein Saw Space Move, Long Before We Could Hear It
Updated February 13, 2016 7:51 AM ET
Published February 13, 2016 7:22 AM ET
by LINDA WERTHEIMER



Albert Einstein once wrote that he was indebted to a favorite uncle for giving him a toy steam engine when he was a boy, launching a lifelong interest in science. AP


Here we are in an election year — once again asking the great see-into-the-future question in politics — who will be the next president?

Yesterday, I picked up the paper (I still have a paper to pick up) and read about a man who did see into the future, Albert Einstein. He developed his theory of general relativity in the early 20th century, and in 1915, he announced his theory that space and time are woven together and that events in the universe can cause space and time to move, to bob and jiggle, to stretch and ripple. Einstein's ideas overturned previous ideas of an orderly universe where planets and solar systems revolved in a calm and eternal magnificence.

And this particular notion — of space and time moving — was, you might say, out there, and not possible to observe.

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hubag bohol

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Re: The dance of spacetime and the music of the spheres
« Reply #1 on: February 14, 2016, 11:17:57 AM »
Now, 100 years later, this most mysterious piece of Albert Einstein's imaginings has reached out to scientists on Earth in the form of a chime, a chirp, a sound which one scientist described as what you might hear if you ran your thumb over piano keys from the lowest rumbly bass to middle C. A chirp in C, which left a distant part of the universe more than a billion years ago and rippled outward, beginning a journey to a very different Earth.

An extraordinary group of scientists, starting in the '70s, began work on ways to listen to the universe and perhaps to hear the sound of space and time moving, bending. Over the years, three men, Ronald Drever and Kip Thorne of Cal Tech, and Rainer Weiss of MIT, searched for a way to detect the movement that by this time most scientists believed in but could not observe.

They built a most improbable pair of instruments, one in Washington State, and one in Louisiana called the Laser Interferometer Gravitational-Wave Observatory — huge tubes and mirrors which could detect and measure impossibly tiny shifts in space and time. And last September, they did.

Two huge black holes fell into one another more than a billion years ago and rattled space and time. And in September, scientists heard that sound and recorded it. It is impossibly impressive, a very great achievement. But one of the things we must celebrate is that 100 years ago, a funny looking little fellow with flyaway hair trained his powerful brain on the universe and imagined what might be true. And was right.

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Re: The dance of spacetime and the music of the spheres
« Reply #3 on: February 16, 2016, 12:56:00 PM »
One Hundred Years of Gravitational Waves
02/15/2016 06:36 pm ET | Updated 4 hours ago
by Santhosh Mathew, PhD
Professor, researcher and writer


We all are familiar with the force of gravity. But, where do the gravitational waves fit in the picture?

On September 14, 2015 at 5:51 am ET, Laser Interferometer Gravitational-wave Observatory (LIGO), detected the gravitational waves for the first time. This discovery confirmed one of the major predictions of Einstein's general theory of relativity, which will definitely pave the way for a new era of observational astrophysics.

The general theory of relativity, published a hundred years ago, describes spacetime as a single dynamic entity and predicts the bizarre phenomena, like black holes and gravitational waves. In other words, Einstein discarded Newtonian notion of the independent nature of space and time and argued that space is not a mere canvas upon which all the events unfold by the mysterious force of gravity, as envisioned by Newton.

The general theory of relativity also predicts that a strong gravitational field, similar to that of the sun, "warps" spacetime and even light is deflected by gravity. In 1919, the British astrophysicist Arthur Eddington measured the bending of star light around the sun during a solar eclipse as predicted by the general theory of relativity -- it was a clear vindication of the validity of this theory. There have been other verifications of general theory of relativity since the days of Eddington.

In fact, the seemingly abstract concept of warping of spacetime produces noticeable effects, such as time dilation that has been measured precisely. The general theory of relativity predicts that the warping spacetime will be larger in stronger gravitational fields. Apparently, clocks on the ground (closer to earth) will run more slowly than the clocks, say, aboard the GPS satellites orbiting the earth.

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Re: The dance of spacetime and the music of the spheres
« Reply #4 on: February 16, 2016, 12:57:34 PM »
Einstein's equations calculate this time difference to be about 38 microseconds per day, and these relativistic effects were taken into account by adding the required mathematical corrections into the system when the GPS satellites were deployed. The general theory of relativity (linked to special theory of relativity) explains even such microscopic anomalies about space and time so beautifully, and they together form the foundation of modern physics.

Another prediction of general theory of relativity is the newly detected gravitational waves. Physicists often describe gravitational waves as "ripples on space-time," caused by moving masses similar to the electromagnetic waves caused by moving charges. Like a pebble dropped in a pond can generate waves propagating in all directions across the water, cataclysmic events such as the collisions of black holes will send out energy propagating through the fabric of the spacetime in the form of gravitational waves.

LIGO scientists estimate that this particular event detected on earth in last September took place about 1.3 billion years ago. The researchers confirmed that these waves were generated by two massive black holes as they spiraled each other until merged together sending these ripples that washed across our planet at the speed of light about five months ago. Indeed, these waves are the voices of stellar ghosts (black holes) as they ripped each other apart in the far corners of the universe and that message was sent to us over the cosmic network.

Astronomers rely on different forms of electromagnetic waves to observe the universe. For example, radio telescopes are used in astronomy to explore the universe by detecting radio signals emitted by different objects. However, we learned to communicate with them -- think of mobile communication that is entirely dependent on radio waves. The detection of gravitational waves marked a triumphant moment in scientific history and will provide a completely new way of looking at the universe.

What will the coming years bring to physics? A new wave from the cosmic ocean, or, perhaps an ocean itself. -- http://www.huffingtonpost.com/

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