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Observable Universe Has Hard Limits
- The observable universe is limited by the finite age of the universe and the opacity of the early plasma.
- We can only causally access a region bounded by the surface of last scattering, so larger-scale features may be unobservable.
Patchy Laws In A Single Vast Cosmos
- A multiverse can mean one large universe with distant patches that have different parameter values or effective laws.
- Different patches could have different expansion histories and physical behavior even without changing fundamental equations.
Standard Model's Two Puzzling Numbers
- The standard model is extremely successful but depends on many measured parameters represented as fields and numbers.
- Two parameters stand out as puzzlingly fine-tuned and drive deeper questions about underlying physics.