View Full Version : Cosmology Questions

2004-Nov-06, 04:39 AM
Doesn't the Principle of Equivalence apply to the large-scale curvature of spacetime? Isn't it, therefore, natural to expect either an acceleration (or deceleration) of bodies moving within the expansion?

I have a picture of the expansion being "caused" by large-scale spacetime curvature. Why do we need something else to explain the expansion, such as a cosmological constant, dark matter, or remnant velocity from a thermodynamic pressure? Once you are freed from these explanations of the expansion, you can think of several reasonable possibilities. In particular, I picture a phase transition very much like an inflationary big bang but where distance and time are unfurled from a homogenous energy outside of distance and time. This pre-universe perfect energy moves at the speed of light (e.g. photons.) Virtual particles created in quantum fluctuations in this pre-universe energy break the symmetry. Matter-energy with direction and time accelerate in an inflationary phase transition away from the energy outside of the universe. The model is consistent with COBE and on the surface seems to be more consistent with the foam like filaments we see in large-scale structure.

2004-Nov-07, 02:50 AM
Here (http://www.universetoday.com/forum/index.php?showtopic=4670&st=45&#entry43383entry43383), here (http://www.universetoday.com/forum/index.php?showtopic=3871&st=15&#entry38065entry38065), and here (http://http://www.universetoday.com/forum/index.php?showtopic=3813&st=15&#entry41991entry41991)
are some additional excursions into speculation by me.