- #1
Edgar L Owen
- 8
- 0
All,
Light cones are always shown with straight sides in textbooks but it seems to me they actually must curve inward and would eventually converge at the point of the big bang if we could see back that far. Thus going back any significant distance in time light cones should curve inward since the universe was considerably smaller and they have to stay within the universe at all times.
For example if the universe has expanded ~1100 times since the CMB (here meaning the surface of last scattering) the curve of light cones back to the CMB should be quite considerable.
Doesn't this mean that
1. we actually see an ~1100x magnfied view of the CMB surface since the curvature of light cones should act as a magnifying lens?
2. The CMB surface we observe was actually 1100 times closer than the distance its light traversed because the radiation we see left it when it was much closer to us than it is now? It's light just had to traverse the large curvature of the light cones from us to it so it took a lot more time to reach us than if it traveled in a straight line?
3. Thus the CMB surface we observe was actually closer than some other distant astronomical objects that were further away when their light was emitted?
I haven't seen this discussed anywhere and wonder whether it's correct or not?
Edgar
Light cones are always shown with straight sides in textbooks but it seems to me they actually must curve inward and would eventually converge at the point of the big bang if we could see back that far. Thus going back any significant distance in time light cones should curve inward since the universe was considerably smaller and they have to stay within the universe at all times.
For example if the universe has expanded ~1100 times since the CMB (here meaning the surface of last scattering) the curve of light cones back to the CMB should be quite considerable.
Doesn't this mean that
1. we actually see an ~1100x magnfied view of the CMB surface since the curvature of light cones should act as a magnifying lens?
2. The CMB surface we observe was actually 1100 times closer than the distance its light traversed because the radiation we see left it when it was much closer to us than it is now? It's light just had to traverse the large curvature of the light cones from us to it so it took a lot more time to reach us than if it traveled in a straight line?
3. Thus the CMB surface we observe was actually closer than some other distant astronomical objects that were further away when their light was emitted?
I haven't seen this discussed anywhere and wonder whether it's correct or not?
Edgar