The new Development of Gravitational Waves Theory and Detection

Details The new Development of Gravitational Waves Theory and Detection The new Development of Gravitational Waves Theory and Detection

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pabei..25...58h&link_type=abstract

Progress in Astronomy (ISSN 1000-8349), Vol. 25, No. 1, p. 58 - 73 (2007)

Astronomy and Astrophysics

Astrophysics

Astrophysics, Gravitational Wave, General Relativistic Theory, Sources Of Gravitational Waves, Astrophysics, Review, Gravitational Waves, General Relativistic Theory, Sources Of Gravitational Waves

Scientific paper

Gravitational waves (GWs) are perturbations of space-time, which propagate at the speed of light. This is one of the predictions from the general relativistic theory proposed by Einstein in 1916. So far, their existence has been proven indirectly by Taylor und Hulse's observation on the decay of the orbital period in the binary pulsar PSR 1913+16. Now the field of GW astronomy is inaugurated. The theory of gravitational radiation already makes an important contribution to the understanding of a lot of astronomical systems, such as binary neutron stars, cataclysmic variables, young neutron stars, low-mass X-ray binaries, and even the anisotropy of the microwave background radiation. Direct detection of GWs is one of the most exciting subjects in physics and in modern astronomy. Up to now it is impossible to generate GWs strong enough in laboratory that they can be detected with the aid of present technology in the world. The celestial sources of GW become the first choice of scientists for studying GWs because of their huge mass and high speed. GWs are quite different from electromagnetic waves, which give rise to the expectation that the detection of GWs will reveal a new and different view of the universe. We can say, the observations of GWs will significantly complement the observations of electromagnetic waves, cosmic rays and neutrinos. A new generation of long baseline GW detectors is currently under construction. They incorporate high sensitive Michelson interferometers and high power stabilized laser sources, suspended optical components and high performance seismic filters. They have arm lengths of up to 4 km and operate in an ultra high vacuum environment. In this paper, the theory of GWs is described first. Then the origin of GWs is discussed. Various efforts for detecting GWs are reviewed briefly. Furthermore, this review discusses the promise of this field, outlining why GWs are worth persuing.

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