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Though an experiment hunting for gravitational waves has yet to find any, its null result helps constrain models of how the universe began.

In this week's edition of Nature, a cohort of researchers report the latest findings from two of the major players in this search for gravitational waves - The LIGO Scientific Collaboration located in the US and the Virgo Collaboration in France and Italy. The paper reports the latest data from these two experiments collected 2005 - 2007, and discusses the implication of these results for the standard picture of cosmology.

Interesting new paper coming out in Nature this week, presenting early scientific results from LIGO on the amplitude of stochastic gravitational radiation background of cosmological origin.

It was supposed to be the first great scientific discovery of the 21st Century - or so many researchers thought when they rushed down to the bookmakers to place bets at what were deemed at the time to be ludicrously generous odds. The physicists believed that they were close to making the first direct detection of gravitational waves, the ripples in space-time generated by supernovas and coalescing neutron stars.

ientists are claiming a stunning discovery in their quest to fully understand gravity.They have observed the warping of space-time generated by the collision of two black holes more than a billion light-years from Earth.The international team says the first detection of these gravitational waves will usher in a new era