Undergrad List of modified gravity theories

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SUMMARY

This discussion focuses on the existence of modified gravity theories, highlighting two prominent models: Loop Quantum Gravity, which aims to quantize gravity, and TeVeS (tensor-vector-scalar gravity), which seeks to formalize MOND into a coherent theory. The conversation emphasizes that many modified gravity concepts, such as MOND, lack robust physical models and are primarily curve-fitting approaches. Additionally, it references two significant articles that explore the implications of recent discoveries, including gravitational waves detected by LIGO, on these modified gravity theories.

PREREQUISITES
  • Understanding of Loop Quantum Gravity principles
  • Familiarity with TeVeS (tensor-vector-scalar gravity)
  • Knowledge of MOND (Modified Newtonian Dynamics)
  • Awareness of gravitational wave discoveries and their implications
NEXT STEPS
  • Research the latest developments in Loop Quantum Gravity
  • Explore the theoretical foundations of TeVeS and its applications
  • Investigate the limitations of MOND and its role in modified gravity discussions
  • Read the review article on modified gravity theories from ScienceDirect
USEFUL FOR

Physicists, cosmologists, and researchers interested in gravitational theories and the implications of modified gravity on current scientific understanding.

windy miller
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There is a an encyclopaedia of all the different inflationary models. But I am wondering is there is a similar list of modified gravity models ?
 
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windy miller said:
There is a an encyclopaedia of all the different inflationary models. But I am wondering is there is a similar list of modified gravity models ?
As far as I know, there's only a handful:
1) Loop Quantum Gravity: an attempt to quantize gravity.
2) TeVeS (tensor-vector-scalar gravity): basically an attempt to turn MOND into an actual theory of gravity.

Most of the rest of the modified gravity concepts (like MOND) aren't really proper theories, as they're basically curve fitting without a physical model. They can probably be best thought of as ways to investigate the possibility of modified gravity, and if one of them seemed to fit the data, the next step would be to come up with a physical model.
 
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I always thought it was odd that we know dark energy expands our universe, and that we know it has been increasing over time, yet no one ever expressed a "true" size of the universe (not "observable" universe, the ENTIRE universe) by just reversing the process of expansion based on our understanding of its rate through history, to the point where everything would've been in an extremely small region. The more I've looked into it recently, I've come to find that it is due to that "inflation"...

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