Does LIGO Ruling Out Linear Gravity Theories?

In summary, the discovery of matches between templates based on GR, along with the presence of strong gravitational fields and high speeds, and a 90% match between model and measured data, rules out linear or quasi-linear alternative theories of gravity. This is evidenced by the increasing number of preprints on arXiv using the new LIGO data, which also includes tests of GR. While the results do put restrictions on alternative theories, they do not surpass previous knowledge from theoretical data of pulsar orbit decay. However, as gravitational-wave detectors become more accurate and collect more signals, this may change. The use of gravitational wave signals from orbiting and merging supermassive black holes provides a unique opportunity to test GR under extreme gravitational conditions.
  • #1
Gravitoastronomy
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As the discovery matches templates based on GR, and the regime is of very strong gravitational fields and very high speeds (relativistic speeds), and there is a 90% match between model and measured data, this does rule out linear or quasi linear alternative theories of gravity?
 
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  • #2
Gravitoastronomy said:
this does rule out linear or quasi linear alternative theories of gravity?

Are there any linear or quasi-linear alternative theories of gravity?
 
  • #4
vanhees71 said:
You find now a lot more preprints than the marvelous PRL from Thursday using the new LIGO data on arXiv. There's also one about tests of GR:

http://arxiv.org/find/gr-qc/1/au:+Collaboration_LIGO_Scientific/0/1/0/all/0/1
Thank you very much. Yes, the results seem to put restrictions to alternative theories, but do not go further than previously known from the theoretical data of pulsar orbit decay, if I understand correctly the data.
 
  • #5
Sure, I guess pulsar timing is still among the most precise tests of GR, but that may change, if gravitation-wave detectors become more accurate and collect more gravitational wave signals. It's just amazing, how much could be learned already from just one signal! Another point is that this tests GR under utmost gravitational fields, i.e., high gravitational fields of orbiting and finally merging supermassive black holes.
 

1. What is LIGO and what does it do?

LIGO stands for Laser Interferometer Gravitational-Wave Observatory. It is a large-scale physics experiment designed to detect gravitational waves, which are ripples in the fabric of space-time predicted by Einstein's theory of general relativity.

2. What are linear gravity theories and what do they propose?

Linear gravity theories are a class of theories that attempt to explain gravity as a force between massive objects, rather than a curvature of space-time. They propose that gravity is a fundamental force, like electromagnetism, and can be described by a linear equation.

3. How did LIGO rule out linear gravity theories?

LIGO detected gravitational waves from a collision between two black holes, which matched the predictions of general relativity. If linear gravity theories were correct, the gravitational waves would have a different pattern, which was not observed. This provided strong evidence against linear gravity theories.

4. Why is ruling out linear gravity theories significant?

Ruling out linear gravity theories is significant because it confirms the validity of Einstein's theory of general relativity, which has been the leading theory of gravity for over a century. It also opens up new possibilities for studying the universe and understanding the nature of gravity.

5. What other evidence supports the validity of general relativity?

In addition to LIGO's detection of gravitational waves, there are other pieces of evidence that support the validity of general relativity. These include the precise predictions of the perihelion shift of Mercury, the bending of light by massive objects, and the existence of black holes. General relativity has also been successfully used in many practical applications, such as GPS technology.

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