Interesting video on infrared modifications to gravity

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SUMMARY

Nima Arkani Hamed's recent talk at Princeton addresses dark energy challenges in cosmology, focusing on modifications to General Relativity (GR) at large distances. He discusses various research programs, including DGP (Dvali-Gabadadze-Porrati), Galileons, and Ghost condensation, which aim to tackle these issues. While some participants express skepticism regarding causality arguments, they acknowledge the compelling nature of GR's inevitability as presented in the talk. The discussion highlights the intersection of particle physics and cosmological theories.

PREREQUISITES
  • Understanding of General Relativity (GR)
  • Familiarity with dark energy concepts in cosmology
  • Knowledge of particle physics principles
  • Awareness of modifications to GR, such as DGP and Galileons
NEXT STEPS
  • Research the Dvali-Gabadadze-Porrati (DGP) model in detail
  • Explore Galileon theories and their implications for cosmology
  • Study the concept of Ghost condensation and its relevance to dark energy
  • Investigate the black hole thermodynamic problem and its connection to causality in GR
USEFUL FOR

Astronomers, cosmologists, and theoretical physicists interested in dark energy, modifications to General Relativity, and the implications of particle physics on cosmological theories.

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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