High School Big Bang Question -- How was the first matter formed?

[phinds]

It means that we are like bacterium compare with the all universe that we actual see it is an real big one space with spot every 300 mm Years light of matter and energy.

What's your point? Are you just being nihilistic or is it something else?

 

[JandeWandelaar]

To me, that question reads exactly as follows "if the universe were almost flat why would it be a coincidence that it is almost flat?"

I merely quoted your statement. If it's almost flat it surely is not a coincidence we measure it close to flat.

 

[phinds]

I merely quoted your statement. If it's almost flat it surely is not a coincidence we measure it close to flat.

You're missing the point. There are an infinite number of values that flatness COULD have. The coincidence would be that it just HAPPENS to be almost exactly flat to within our ability to measure it instead of any of the other infinite values it could have.

 

[Orodruin]

I merely quoted your statement. If it's almost flat it surely is not a coincidence we measure it close to flat.

No, you either misread it, misunderstood it, or willfully misrepresented it. Neither of which is very constructive to further the conversation.

 

[jbriggs444]

You're missing the point. There are an infinite number of values that flatness COULD have. The coincidence would be that it just HAPPENS to be almost exactly flat to within our ability to measure it instead of any of the other infinite values it could have.

Without knowing the distribution of values that the flatness could have, it is perhaps premature to be using uppercase letters to express amazement that the flatness is zero to within the sensitivity of our measurements.

 

[Orodruin]

Without knowing the distribution of values that the flatness could have, it is perhaps premature to be using uppercase letters to express amazement that the flatness is zero to within the sensitivity of our measurements.

I mean, one of the purposes of inflation is to drive the universe undistinguishably close to flatness from basically any other curvature distribution. It all depends on what one assumes, but almost any distribution that is somewhat ”natural” without additional mechanisms such as inflation will typically result in larger expected deviations.

 

[JandeWandelaar]

And they might add that of ALL the infinite values it COULD have, the fact that it is flat within our ability to measure it is just one HELL of a co-incidence if it's not actually flat. That's not any kind of proof but it sure is suggestive.

There are more almost flat universes than universes with small radius.

I mean, one of the purposes of inflation is to drive the universe undistinguishably close to flatness from basically any other curvature distribution

Is it the purpose of inflation or the effect of inflation that the universe is driven to (close to) flatness? Or was it invented with the purpose of explaining observed flatness? Maybe it's just playing with words...

 

[phinds]

Or was it invented with the purpose of explaining observed flatness?

Well, yes and no. Guth "invented" it to explain flatness but it was then discovered that it ALSO explains other serious problems so it is a highly favored theory, albeit not proven.
https://wmap.gsfc.nasa.gov/universe/bb_cosmo_infl.html

It is definitely not just playing with words.

 

[Orodruin]

There are more almost flat universes than universes with small radius.

According to what measure?

Is it the purpose of inflation or the effect of inflation that the universe is driven to (close to) flatness? Or was it invented with the purpose of explaining observed flatness? Maybe it's just playing with words...

You are just playing with words. Obviously no physical model has any form of deeper purpose other than describing observations.

 

[JandeWandelaar]

Obviously no physical model has any form of deeper purpose other than describing observations.

I think this is not so obvious. Besides describing the observations the model can show us what reality looks like.

But let's not go philosophical...