2009年11月14日

Gravity ripples chased

Discovering gravitational waves would not only validate Einstein's theory of gravitation but also reveal aspects of the Universe's earliest moments.

The hunt for these elusive ripples is now well under way.


For several decads, physicists have been racing to detect gravitational waves ― tiny disturbances in space-time that propagate at the seed of light.

But the experiments are challenging.

They require detection of minute changes ― a mere fraction of the size of an atomic nucleus ― in kiloletre-scale separations between free-floating masses.

Although gravitational waves have yet to be detected, on page 990 of this issue the LIGO Scientific Collaboration and the Virgo Collaboration report a milestone in this quest.

The authors imorove on a long-standing upper limit to the number of gravitational waves generated in the early Univerce.



### see dada / data bace ###
nature 460,925-1050 20 August 2009 Isse no 7258
Letter p.990 / An upper limit on the stochastic gravitational-wave background of cosmological origin / LIGO & Virgo
News and Views p.964 / Astrophysixs : Garavity ripples chased / Marc Kamionkowski
LIGO in the background

posted by 0≠素子 at 23:44| Comment(0) | astrophysics | このブログの読者になる | 更新情報をチェックする
×

この広告は1年以上新しい記事の投稿がないブログに表示されております。