Can expansion be due to largescale curvature?by claycravens Tags: accleration, curvature, expansion, universe 

#1
Jan1612, 01:57 PM

P: 1

I wanted to say I love the posts on this Cosmology forum  very good reads.
My question is whether there is enough to largescale curvature alone to cause the expansion of the universe as we measure it? Why can't galaxies accelerating away from us be moving in curved space? I agree with the idea of infinite matterenergy density at some time in the past and also with inflation. I believe I understand homogeneity and isotropy. The question in part is whether largescale curvature satisfactory to move galaxies in ever increasing velocities with further distances would be consistent with observations like COBE data and also would it be symmetrical. Clay Cravens 713 858 2724 



#2
Jan1612, 08:35 PM

P: 1,262

Expansion isn't due to 'curvature', per se. Curvature is defined at a point (or region) of spacetime, while expansion is the behavior of curvature over timethe 'velocity' of the curvature, if you will.
Accelerated expansion is a level further away from curvature itself, its like the 'acceleration' of the curvature (again, a loose metaphor) and requires a driving force beyond the curvature itself. But galaxies certainly are moving in curved space. 



#3
Jan1712, 01:09 AM

Sci Advisor
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#4
Jan1712, 12:55 PM

P: 1,262

Can expansion be due to largescale curvature?
Yeah, @Chalnoth is definitely correct; not sure what I was thinking on that one...



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