Latest Theories of gravitation Stories

2010-02-17 14:25:13

Scientists measure interference between matter waves separated by 0.1 mm While airplane and rocket experiments have proved that gravity makes clocks tick more slowly "“ a central prediction of Albert Einstein's general theory of relativity "“ a new experiment in an atom interferometer measures this slowdown 10,000 times more accurately than before, and finds it to be exactly what Einstein predicted. The result shows once again how well Einstein's theory describes the real world,...

2009-08-24 11:20:00

Does an exciting but controversial new model of quantum gravity reproduce Einstein's theory of general relativity? Scientists at Texas A&M University in the US explore this question in a paper appearing in Physical Review Letters and highlighted with a Viewpoint in the August 24th issue of Physics (http://physics.aps.org)."If it ain't broke, don't fix it," sums up fairly well how many scientists have viewed Einstein's theory of general relativity. The theory, which Einstein developed in...

2009-08-17 19:45:00

Quantum mechanics and Einstein's theory of general relativity are both extremely accurate theories of how the universe works, but all attempts to combine the two into a unified theory have ended in failure. When physicists try to calculate the properties of a quantum theory of gravity, they find quantities that become infinite -- infinities that are so bad they can't be removed by mathematical gambits that work in other areas of physics.Now, Zvi Bern, John Carrasco, and Henrik Johanssen at...

2008-01-31 17:15:00

MADISON - When the world's most powerful particle accelerator starts up later this year, exotic new particles may offer a glimpse of the existence and shapes of extra dimensions. Researchers from the University of Wisconsin-Madison and the University of California-Berkeley say that the telltale signatures left by a new class of particles could distinguish between possible shapes of the extra spatial dimensions predicted by string theory. String theory, which describes the fundamental...

2008-01-15 06:00:09

There is no attractive gravitational force between matter. Gravitation is based on a repelling force. Gravitation arises from particle pressure towards matter. These are some claims of the General Theory of Matter, which is based upon the predicted existence of a very small and extremely abundant particle, the universal energy unit, here called the K-particle. The theory shows how local disturbance of the K flux (K pressure) can generate all known forces. Furthermore it demonstrates working...

2007-10-26 05:58:26

For almost 75 years, astronomers have believed that the Universe has a large amount of unseen or "Ëœdark' matter, thought to make up about five-sixths of the matter in the cosmos. With the conventional theory of gravitation, based on Newton's ideas and refined by Einstein 92 years ago, dark matter helps to explain the motion of galaxies, and clusters of galaxies, on the largest scales. Now two Canadian researchers at the Perimeter Institute for Theoretical Physics suggest that the...

2007-05-18 17:00:00

In the folklore of physics, no story is better known than the tale of Galileo dropping balls from the Leaning Tower of Pisa and proving that gravity accelerates all objects equally regardless of their masses or composition. This is called the "equivalence principle," and it is a cornerstone of modern physics. But was Galileo correct? NASA -- Standing on the Moon in 1971, Apollo 15 astronaut Dave Scott held his hands out at shoulder height, a hammer in one hand and a feather in the other. And...

2007-01-12 06:00:00

ST. LOUIS -- The laboratory is cluttered with dirty dishes, Dorito crumbs, aluminum foil and needle-nose pliers _ the detritus of graduate students whose 600-pound steel and wire Tinkertoy is rising in the middle of the room. With the apparatus, Ramanath Cowsik, a Washington University physicist, will poke and prod at some of the most daunting problems remaining in physics: What is causing the universe to fly apart, faster and faster each year? Why is gravity so weak and so different...

2005-04-06 08:04:12

RAS -- For almost 100 years, scientists have been searching for direct evidence of the existence of gravity waves "“ faint ripples in the fabric of spacetime predicted in Albert Einstein's theory of General Relativity. Today, the hunt for gravity waves has become a worldwide effort involving hundreds of scientists. A number of large, ground-based facilities have been developed in Europe, the United States and Japan, but the most sophisticated search of all will soon take place in...

2005-03-05 05:35:00

NASA -- Thirty-five years after Moon-walking astronauts placed special reflectors on the lunar surface, scientists have used these devices to test Albert Einstein's general theory of relativity to unprecedented accuracy. The findings, which also confirm theories from Galileo Galilei and Isaac Newton, may help to explain physical laws of the universe and benefit future space missions. "Our research with the Lunar Laser Ranging experiment probes the equivalence principle, a foundation of...

Latest Theories of gravitation Reference Libraries

Classical and Quantum Gravity
2012-05-12 20:18:16

Classical and Quantum Gravity is a peer-reviewed journal published by IOP Science. As of May 2012, the editor-in-chief is Clifford M Will (Washington University, St. Louis). The journal covers all aspects of gravitational physics and the theory of space-time. It scope includes: Classical general relativity, Applications of relativity, Experimental gravitation, Cosmology and the early universe, Quantum gravity, Supergravity, superstrings and supersymmetry, and Mathematical physics relevant...

2004-10-19 04:45:44

String Theory -- A string theory is a physical model whose fundamental building blocks are extended objects (strings, membranes and higher-dimensional objects) rather than points. String theories are able to avoid problems, such as infinite energy density, associated with the presence of mathematical points in a physical theory. The term 'string theory' properly refers to both the 26 dimensional bosonic string theories and to the 10 dimensional superstring theories discovered by...

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