Archive for September, 2008

China astronauts return as heroes

After making the country’s first spacewalk, three Chinese astronauts returned safely to Earth on Sunday. They landed in northern China’s Inner Mongolia region.

Mission commander Zhai Zhigang, 41, was watched on television by countless millions around the globe as his 15-minute spacewalk vaulted China into ranks of the United States and the former Soviet Union as the only nations to complete a spacewalk.

China sent its first man into space in 2003 and followed up with a two-man mission in 2005.

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This week a paper puplished arxiv titled :Gravitational fields as generalized string models

We show that Einstein’s main equations for stationary axisymmetric fields in vacuum are equivalent to the motion equations for bosonic strings moving on a special nonflat background. This new representation is based on the analysis of generalized harmonic maps in which the metric of the target space explicitly depends on the parametrization of the base space. It is shown that this representation is valid for any gravitational field which possesses two commuting Killing vector fields. We introduce the concept of dimensional extension which allows us to consider this type of gravitational fields as strings embedded in D-dimensional nonflat backgrounds, even in the limiting case where the Killing vector fields are hypersurface orthogonal.

  Link : http://arxiv.org/abs/0809.4495

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I have just gone through the press release from CERN. They said that investigations at CERN following a large helium leak into sector 3-4 of the Large Hadron Collider (LHC) tunnel have indicated that the most likely cause of the incident was a faulty electrical connection between two of the accelerator’s magnets. Before a full understanding of the incident can be established, however, the sector has to be brought to room temperature and the magnets involved opened up for inspection. This will take three to four weeks. Full details of this investigation will be made available once it is complete.

The time necessary for the investigation and repairs precludes a restart before CERN’s obligatory winter maintenance period, bringing the date for restart of the accelerator complex to early spring 2009. LHC beams will then follow.

Original press release 

More about LHC incident at the New York Times, BBC News, and the London Times. And more from the BBC.

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Today is 10th september,2008 and LHC has started up. Beam is in the LHC now. So CERN is really hot. Two blogs have started live bloging to keep us updated – Cosmic Variance and symmetry breaking . You can also get updates in the blog of  Tommaso Dorigo. Here is the plan for tomorrow . Best of luck for LHC.

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