- #1
MathematicalPhysicist
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Are there any cosmological models that say that the shape of the universe changes with time?
As in it may oscillate between being a sphere, torus , saddle or a plane?
I remember the course in Astrophysics that I took in my BSc studies, and we had it that the shape of the universe depends on the cosmological constant, ##k## either it's positive, negative or zero.
And the options were if we had k>0 then it's a sphere if it's k<0 it's a saddle and for k=0 a plane.
Why isn't there an option of a torus?
As in it may oscillate between being a sphere, torus , saddle or a plane?
I remember the course in Astrophysics that I took in my BSc studies, and we had it that the shape of the universe depends on the cosmological constant, ##k## either it's positive, negative or zero.
And the options were if we had k>0 then it's a sphere if it's k<0 it's a saddle and for k=0 a plane.
Why isn't there an option of a torus?