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TOPIC: Gravity


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RE: Gravity
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Is gravity left-handed?
Is gravity left-handed? For years, physicists have been looking for a definitive answer that may provide a clue to a long-sought theory of quantum gravity. Now British scientists say it could be known by 2013.
General relativity describes gravity's actions at large scales. For tiny scales, however, a theory of quantum gravity, incorporating quantum mechanics, is needed.
General relativity doesn't distinguish between right and left, so one might expect gravity to be transmitted by both varieties. But the quantum world may play favourites.

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Gravity is unruly. It can throw theorists' equations into chaos, and has proved a stumbling block to the creation of a single 'theory of everything'. But an analysis now shows that gravity may at least make some fundamental calculations more manageable.
David Toms, a theoretical physicist at Newcastle University, UK, has found that gravity seems to calm the electromagnetic force at high energies. The finding could make some calculations easier, and is a rare case in which gravity seems to work in harmony with quantum mechanics, the theory of small particles. His paper is published today in Nature.

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Gravitational constant
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Recent measurements of gravitational constant increase uncertainty over accepted value.

The Newtonian constant of gravitation - known in the finely tuned business of metrology as 'big G'  - has come a long way since British physicist Henry Cavendish first measured the gravitational attraction of Earth in 1798. Although G derived from Cavendish's measurements had an uncertainty of about 1%, modern measurements have tightened that to just a couple of tens of parts per million.
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Clips from the Horizon programme "What on Earth is wrong with gravity?" featuring physicist, Dr Brian Cox.

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What on Earth is wrong with gravity?
Particle physicist and ex D:Ream keyboard player Dr Brian Cox wants to know why the Universe is built the way it is. He believes the answers lie in the force of gravity. But Newton thought gravity was powered by God, and even Einstein failed to completely solve it. Heading out with his film crew on a road trip across the USA, Brian fires lasers at the moon in Texas, goes mad in the desert in Arizona, encounters the bending of space and time at a maximum security military base, tries to detect ripples in our reality in the swamps of Louisiana and searches for hidden dimensions just outside Chicago.



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