- #1
msailer1234
- 13
- 1
Hi,
I have become very interested in cosmology recently and I had a question about the possible shapes of the Universe. I understand the critical density plays a role in the shape. This is what I know (or think I know). At the critical density of energy and matter, the universe is flat. If it is less than the critical density it is saddle shaped. If it is greater than the critical density, it is spherical and finite curving back on itself so that traveling any direction would hypothetically bring you back to the same point.
My question is, what is the geometry and characteristics of the flat and saddle universe in regards to boundaries? Does the saddle universe also curve back on itself in a certain way in theory? Or do these seemingly open universe concepts have infinite dimensions of space and/or space time?
Additionally, if you could direct me to some great journal articles on the subject that are relatively (no pun intended) easy to understand, that would be fantastic! (no worries if you can't think of any)
Thanks!
I have become very interested in cosmology recently and I had a question about the possible shapes of the Universe. I understand the critical density plays a role in the shape. This is what I know (or think I know). At the critical density of energy and matter, the universe is flat. If it is less than the critical density it is saddle shaped. If it is greater than the critical density, it is spherical and finite curving back on itself so that traveling any direction would hypothetically bring you back to the same point.
My question is, what is the geometry and characteristics of the flat and saddle universe in regards to boundaries? Does the saddle universe also curve back on itself in a certain way in theory? Or do these seemingly open universe concepts have infinite dimensions of space and/or space time?
Additionally, if you could direct me to some great journal articles on the subject that are relatively (no pun intended) easy to understand, that would be fantastic! (no worries if you can't think of any)
Thanks!