Universe expansion

Or let me rephrase it this way: assuming that today comoving distance equals proper distance, is there a limit for the size of the observable Universe in units of today's proper distance?

>>7728893
No. The Hubble sphere saturates in comoving coordinates but not in proper units.

>>7728981
So, it means that the observable Universe will eventually become infinitely large and, threoretically, two particles at infinte distance could interact?

>>7729108
>it means that the observable Universe will eventually become infinitely large

After infinite time, yes, the matter making up the universe we currently observe will grow infinitely separated. However, the Observable Universe - as in, the zone of space we can actually observe and interact with - will contain less and less matter as a result, although it too will grow due to lightspeed.

>threoretically, two particles at infinte distance could interact?

No. Why would you think that? In fact, eventually the expansion of the universe will drive everything so far apart that every particle's observable universe contains no other particles.

>>7729337
I'm more interested in Dirac's idea of continual creation of matter.

>>7729337
>eventually the expansion of the universe will drive everything so far apart that every particle's observable universe contains no other particles.

But how if each individual observable Universe (i.e. observable Universe of each particle) will become infinite?

>>7729352
you can fit infinitely many infinite observable universes into the infinite whole universe

>>7729355
Fuck off

>>7729347
Why?

>>7729355
I can fit infinitely many infinite observable universes into your mom's black hole.