Does LIGO Ruling Out Linear Gravity Theories?

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Discussion Overview

The discussion centers around the implications of LIGO's findings on linear and quasi-linear theories of gravity, particularly in the context of general relativity (GR) and strong gravitational fields. Participants explore whether the new data from LIGO rules out alternative theories of gravity and the significance of these findings in relation to existing tests of GR.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • Some participants suggest that the discovery, with a 90% match between model and measured data, may rule out linear or quasi-linear alternative theories of gravity.
  • Others inquire about the existence of linear or quasi-linear alternative theories of gravity, indicating a need for clarification on this topic.
  • One participant notes the availability of numerous preprints on arXiv that utilize the new LIGO data, including studies that test GR.
  • Another participant acknowledges that while the results may impose restrictions on alternative theories, they do not extend beyond what was previously known from pulsar orbit decay data.
  • There is a suggestion that pulsar timing remains one of the most precise tests of GR, although advancements in gravitational wave detection could enhance understanding in the future.
  • Participants highlight the significance of testing GR under extreme conditions, such as those involving supermassive black holes during merging events.

Areas of Agreement / Disagreement

Participants express differing views on whether LIGO's findings definitively rule out linear or quasi-linear theories of gravity. While some believe there are restrictions placed on these theories, others argue that the implications are not as far-reaching as suggested.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the implications of LIGO's findings and the definitions of linear and quasi-linear theories of gravity. The scope of the discussion is also constrained by the reliance on existing data from pulsar orbit decay.

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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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?
 
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.
 
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.
 

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