 
Flatland
with gravity - how does that work? In one time and two space dimensions,
the Einstein equation is almost too simple, but the results are not! See
how spacetime curvature warps light cones, creates ambiguities in causal
boundaries, and even allows at least a mathematical possibility for time
travel.
Why no gravitational force in d=2+1 spacetime? Flat 2+1 dimensional spacetime.
2+1 dimensional spacetime with one massive point particle.
2+1 dimensional spacetime with one spinning point particle. (Coming next month)
Go back to Time Travel in Flatland.
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