Jump to content

The assumption of bounded/unbounded space


Recommended Posts

[math]a(t)[/math] is a function of time, it describes the relative expansion of the universe. How it evolves is a dynamic question in GR and can be solved depending on the matter content.


In a matter dominated universe we have [math]a(t)\approx t^{2/3}[/math] and for a radiation dominated universe we have [math]a(t) \approx t^{1/2}[/math] (we have assumed a perfect fluid equation of state)


For details pick up any book on cosmology, I recommend Andrew Liddle's "Introduction to Modern Cosmology".

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.