October 6, 2013
Mohenjo
Science
Albert Einstein, amazon, Astronomy, business, Business News, current-events, Curved Space-Time, Environment, Future, Gravitational Lensing, gravity, Hotels, huffingtonpost, Hui Liu, light rays, Mathematics, Microchips, path of light, Physics, research, Science, Science News, Slideshow, solar eclipse, Space, Space Time, Space-Time On Chip, Spacetime, technology, Technology News, theory of relativity, travel, vacation
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It took two major expeditions charting the solar eclipse of 1919 to verify Albert Einstein’s weird prediction about gravity — that it distorts the path of light waves around stars and other astronomical bodies, distorting objects in the background. Now, researchers have created the first precise analogue of that effect on a microchip.
Any large mass distorts the geometry of space around it, for instance making parallel light rays diverge or converge. One consequence, described by Einstein’s general theory of relativity, is that objects behind a body such as the Sun may look magnified or distorted as the optical path of light goes through the region of warped space.
Metamaterials scientist Hui Liu of Nanjing University in China and his colleagues mimicked this ‘gravitational lensing’ — which affects light in the vacuum of space — by making light travel through solid materials instead. Different transparent media have different indexes of refraction, causing light to bend. One example is at the interface between water and air, a familiar effect that makes a pencil look broken when it is half-dipped in water. But if a medium has an index of refraction that varies gradually rather than abruptly, it will make the the paths of light rays curve as they travel through it.
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The warping of the empty space around a massive star means that the shortest path of light around a star is a ‘curved’ one — but the bending of light rays in a medium can mimic the same effect. | Nature Photonics
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May 9, 2013
Mohenjo
Science
Albert Einstein, amazon, Astrophysics, black holes, business, Calif, Carnegie Institution for Science, climate, Cosmology, Einstein, einstein general relativity, Future, gadgets, General Relativity, general relativity theory, general theory of relativity, gravitational waves, gravity, Gravity Waves, Hotels, huffingtonpost, Mansi M. Kasliwal, Pasadena, Physics, research, Science, Science News, Slideshow, Space, technology, Technology News, theory of relativity, travel, vacation, Video
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In the next five years or so, scientists are poised to discover proof that space and time can wrinkle in the form of gravitational waves. These waves were predicted almost 100 years ago by Albert Einstein’s general theory of relativity, but have yet to be seen.
That could change soon when the latest, most sensitive experiments hunting gravitational waves come online. “There’s so much activity and excitement in the field right now,” said Mansi M. Kasliwal, an astronomer at the Observatories of the Carnegie Institution for Science in Pasadena, Calif. “The momentum is really building.”
Kasliwal is the author of a paper published online today (May 2) in the journal Science describing the burgeoning field of gravitational wave studies.
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3D visualization of gravitational waves produced by two orbiting black holes.
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.Click link below for story, slideshow, and video:
http://www.huffingtonpost.com/2013/05/03/gravity-waves-found-einstein-general-relativity-theory_n_3203364.html?ref=topbar
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May 2, 2012
Mohenjo
Science
20th-century mathematical genius, Amalie Noether, Bryn Mawr College, Einstein, emmy noether, flee Germany, match, mathematical genius, mathematician, New York Times, Noether’s theorem, obscurity, ovarian cyst, research, Science, Scientists, theory of relativity, Times
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Scientists are a famously anonymous lot, but few can match in the depths of her perverse and unmerited obscurity the 20th-century mathematical genius Amalie Noether.
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.Click link below for story, it contains 2 pages:
http://www.nytimes.com/2012/03/27/science/emmy-noether-the-most-significant-mathematician-youve-never-heard-of.html?ref=science
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