New model of quantum gravity may rewrite Einstein's theory of general relativity

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Washington, August 25 (ANI): Scientists at Texas A and M University in the US have developed a controversial new model of quantum gravity, which might reproduce Albert Einstein's theory of general relativity.

The theory, which Einstein developed in the early 20th century, says that matter curves spacetime, and it is this curvature which deflects massive bodies - an effect that we interpret as the influence of gravity.

The theory has been tested to extremely high accuracy and without it, our satellite global positioning system would be off by about 10 km per day.

Despite the success of general relativity, one of the most important problems in modern physics is finding a theory of quantum gravity that reconciles the continuous nature of gravitational fields with the inherent 'graininess' of quantum mechanics.

Recently, Petr Horava at Lawrence Berkeley Lab proposed such a model for quantum gravity that has received widespread interest, in no small part because it is one of the few models that could be experimentally tested.

In Horava's model, Lorentz symmetry, which says that physics is the same regardless of the reference frame, is violated at small distance scales, but remerges over longer distance scales

The team at Texas A and M, which includes Hong Lu, Jianwei Mei and Christopher Pope, report their investigations into how the modifications proposed in Horava's theory will broadly affect the solutions of general relativity.

Lu and his team's calculations suggest that Horava's model only reproduces general relativity on unobservable scales, "larger than the size of the Universe".

The research team's paper is an important contribution to testing the Horava model and shows that a good deal of work remains to understand its full implications. (ANI)

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