Detection of gravitational radiation from pulsars

  • Hiromasa Hirakawa
Experimental aspects of general relativity
Part of the Lecture Notes in Physics book series (LNP, volume 124)


I have described what we are doing now in our effort to detect GR from the Crab pulsar.We hope to reach the target in 1980's.In concluding this paper, I will tell about a small experiment we are planning to do.We wanted to have a certain source of dynamic gravitational field simulating GR from Crab pulsar which can be used to calibrate the antenna sensitivity and which will ensure that everything is working all right. For this purpose we rotate a 50 kg steel bar, 0.6 m long, at 1800 rpm in precise resonance with the antenna. The dynamic gravitational field thus generated has been detected by our antenna at 2 m distance with a signal to noise ratio 100 on an oscilloscope screen. Although the antenna in this case is not sensing a field of GR, this is a convenient way of testing the antenna performance. In addition, using this rotating bar we can check the Newtonian law of gravitation over a distance 2 — 10 m.It seems that no one has ever demonstrated the inverse square law of gravitation directly in the range of distance between 1 m and 10000 km [9], and there are even theoretical arguments suggesting a failure of the inverse square law at a certain distance [10, 11]. Our test, which is made possible due to the enormous sensitivity of the GR detector, will be completed shortly and I hope I can report on this subject soon.


Brownian Motion Neutron Star Gravitational Radiation Electronic Cool Crab Pulsar 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Hiromasa Hirakawa
    • 1
  1. 1.Department of PhysicsThe University of TokyoTokyoJapan

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