Jump to content

Are inflation and expansion relativistic theories?


Recommended Posts

I don't think General Relativity  predicted either ,did it?

 

So ,when thinking about them is GR of any import?

For example ,with inflation it occured to me that with the enormous activity occurring it might be represented as space stretching and time stretching less(or contracting?)

 

But then I thought  "Maybe GR has nothing to do with this?"

Link to comment
Share on other sites

As long as quantum gravity is not involved, yes, they are.

Yes, GR predicted that the universe is not stable, i.e., either expands or contracts.

But what do you mean by

17 minutes ago, geordief said:

time stretching ... or contracting

 

Link to comment
Share on other sites

1 minute ago, Genady said:

 

But what do you mean by "time stretching..or contracting"

 

Well expansion is described  as space (that is not bound by gravity -ie the space between galaxies I think) increasing  uniformly with time.

In relativity it is said that time dilation is accompanied by a corresponding  spatial contraction(if I have that right).

Would the same apply in inflation or expansion?

(Not that I can detect a frame of reference to apply it to if it was applicable)

Link to comment
Share on other sites

4 minutes ago, geordief said:

Would the same apply in inflation or expansion?

No, it does not. The time dilation and length contraction you mention apply to two inertial frames moving relative to each other. This is not the case in the expanding universe.

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
 Share

×
×
  • 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.