Causal patch
A causal patch is a region of spacetime connected within the relativistic framework of causality (causal light cones).
Background
After Leonard Susskind proposed the black hole complementarity conjecture for black holes in quantum gravity, he realized it would also apply to a de Sitter universe with a positive cosmological constant with the cosmological horizon in place of the event horizon. The region within the horizon is the causal patch,[1][2] and it is self-contained. This means we may neglect what happens beyond the cosmological horizon. A consequence of this radical conjecture is that the total number of states of the universe is finite.
gollark: Also, you can already use similar if somewhat worse capability now and it didn't cause horrible crises.
gollark: It isn't *that* good. You need manual handling for it to make sense.
gollark: And I don't think you're right that this would massively accelerate fake news production.
gollark: I don't see how adding more fake news sites would necessarily cause this.
gollark: And? People only have so much attention.
References
- Dyson, Lisa; Kleban, Matthew; Susskind, Leonard (October 2002). "Disturbing Implications of a Cosmological Constant". Journal of High Energy Physics. 2002 (10): 011. arXiv:hep-th/0208013. Bibcode:2002JHEP...10..011D. doi:10.1088/1126-6708/2002/10/011.
- Goheer, Naureen; Kleban, Matthew; Susskind, Leonard (July 2003). "The Trouble with de Sitter Space". Journal of High Energy Physics. 2003 (7): 056. arXiv:hep-th/0212209. Bibcode:2003JHEP...07..056G. doi:10.1088/1126-6708/2003/07/056.
See also
| Central concepts |
| ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Toy models | |||||||||
| Quantum field theory in curved spacetime | |||||||||
| Black holes | |||||||||
| Approaches |
| ||||||||
| Applications | |||||||||
| |||||||||
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.