Minkowski Diagram: Expanding Universe

[sqljunkey]

Is this how you would draw the Minkowski space diagram with space expanding, (without acceleration or black holes) ?

 

[PeterDonis]

the Minkowski space diagram with space expanding

There is no such thing. The "expanding space" spacetime models (the FRW spacetimes) are not flat, so they're not Minkowski spacetime. So you can't draw a Minkowski spacetime diagram of them at all.

 

[Dale]

Is this how you would draw the Minkowski space diagram with space expanding, (without acceleration or black holes) ?

You might want to look at the Milne model

https://en.m.wikipedia.org/wiki/Milne_model

 

[Ibix]

It's reasonable to want to draw a map of a (1+1) dimensional slice of spacetime. However this isn't a Minkowski diagram unless it's Minkowski spacetime. There's also more than one way to do it in curved spacetime, much as there are multiple flat representations of the surface of the Earth. For example, see figure 1 in Davis and Lineweaver https://arxiv.org/abs/astro-ph/0310808