That does not say that space does not expand in your bedroom, it merely says that the effect is not obvious under those conditions. The implication is that space does, indeed, expand in your bedroom. In fact, as far as I can see, the 'homogeneous' and 'isotropic' conditions are only there to simplify the calculation.

 

That is not what it says. It says that expansion has no "local counterpart"; i.e. it doesn't happen locally (because of the lack of homogeneity).

 

 

Are you saying gravity actually prevents space expanding, or gravity merely prevents matter moving apart as space expands?

 

How are those different?

1.

 

"physical conditions that manifest the effects de- scribed as the expansion of space are not met"

 

manifest: readily perceived by the eye or the understanding; evident; obvious; apparent; plain

 

ie-> the conditions that make the effects obvious do not exist, not-> the effects do not exist.

 

2.

 

"Are you saying gravity actually prevents space expanding, or gravity merely prevents matter moving apart as space expands?"

 

In the former, space does not expand, in the latter, it does.

That meaning of manifest would not make sense in that context it is pretty obvious that they mean "cause". Have you read that paper, rather than just that paragraph? It will be obvious what they mean by it.

 

 

In the former, space does not expand, in the latter, it does.

 

And how would you detect/measure that?

I'm a mathematician, I don't measure things.

 

I read section 2.2.

Edited October 10, 20169 yr by Ivanov2000

I'm a mathematician, I don't measure things.

 

 

Then I suggest you read the John Baez link I provided above and don't skip the maths.

...

Edited October 10, 20169 yr by Ivanov2000