Interesting video on infrared modifications to gravity

In summary, Nima Arkani Hamed of IAS at Princeton recently gave a talk discussing his thoughts on the dark energy problems of cosmology and various research programs aimed at addressing it through modifications to General Relativity at large distances. The presentation also touched on causality arguments and the black hole thermodynamic problem, as well as the potential insights from particle physics on the inevitability of GR.
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Haelfix
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This is a talk by Nima Arkani Hamed of IAS at Princeton from a few days ago, where he discusses his thoughts on the dark energy problems of cosmology and various popular research programs aimed at addressing it by modifying General relativity at large distances (examples like DGP, Galileons, Ghost condensation etc etc).

https://webcast.stsci.edu/webcast/detail.xhtml?talkid=3398&parent=1

A very interesting presentation, although I don't buy the causality arguments by themselves (the black hole thermodynamic problem is much more convincing).

Nevertheless there is some interesting material well known to particle physicists regarding the inevitability of GR, that is perhaps not as well known elsewhere.
 
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@Haelfix did you find any more insight on this topic?
 

1. What is infrared modification to gravity?

Infrared modification to gravity is a theoretical framework that suggests that the behavior of gravity at long distances can be modified by adding new fields or particles to the theory of gravity. This modification is based on the idea that gravity is not a fundamental force, but rather an emergent phenomenon that arises from the interactions of other underlying fields.

2. How does infrared modification to gravity differ from Einstein's theory of general relativity?

Einstein's theory of general relativity is a classical theory of gravity that describes the gravitational force as curvature of space-time. In contrast, infrared modification to gravity suggests that the behavior of gravity can be modified at long distances by adding new fields or particles to the theory. This allows for a better understanding of the nature of gravity, especially in the weak-field regime.

3. What are the potential implications of infrared modification to gravity?

If infrared modification to gravity is confirmed to be a valid theory, it could potentially revolutionize our understanding of the universe and its fundamental forces. It could also have practical applications, such as improving our ability to detect and measure gravitational waves.

4. How is infrared modification to gravity being tested or observed?

Currently, infrared modification to gravity is mostly being explored through theoretical and mathematical models. Some experiments have been proposed to test this theory, such as using atomic clocks to measure gravitational redshift and studying the bending of light around massive objects.

5. Is infrared modification to gravity widely accepted in the scientific community?

Infrared modification to gravity is a relatively new and still developing theory, so it is not yet widely accepted in the scientific community. However, it has gained attention and interest among physicists and is being actively researched and studied. More evidence and experiments are needed to fully confirm or refute this theory.

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