/sci/ - Science & Math

>>12338362
the earth is a flat sheet on a non euclidean surface. can go both with a spheroid and hyperbolic but it sounds just like you are going through extra steps to come to the same conclusion

How does /sci/ feel about the current "crisis" in cosmology?

Basically, a recently published paper created models for a closed Universe structure and came back with huge discrepancies in the possible age of the universe. Using locally measured variables like cepheid candles and super novae distances gets a result of around 13.5 billion years, while using c and a traditional flat or open universe model gets you an age of around 14 billion years. In the past cosmologists basically just said, "its between 13.5 and 14 billion y/o but we dont know exactly."

However in recent years a closed universal model has been gaining popularity, particularly as we advance our understanding of quantum mechanics. If the Universe is closed then there is a 5 billion year discrepancy between the locally measured age of the Universe and the modeled age of the universe, which is completely inexplicable other than completely new physics we dont have any understanding of, or a complete break down of Newtonian/relativistic physics.

How does /sci/ feel about this?

>>10852337

It means that angles between two points in space (no matter how astronomically far away) are like the angles on sheet of paper. If the universe were to be curved, the angles would be noticeably different. It was actually very weird that we found out that is so flat, given that we live in an expanding universe. This is the flatness problem.

If space is flat how come we can move up and down in it?

Checkmate, scifags.

Yes, given a perfectly flat spacetime curvature.

>>10575820

Inflation is a potential solution to three major problems in the Big Bang theory:

Horizon problem
Flatness problem
Magnetic-monopole problem

There's no hard probe that it ever happened, though. It is believed to be truth because without it, it's hard to solve these three problems in cosmology.

>mass curves space time
>all data suggests the universe is flat

well... which one is it?

Brainlet here, what's the shape of the universe?

>>9342126
Spacetime

there were a big discussion by physicists about whether the universe is actually flat or not

>https://en.wikipedia.org/wiki/Shape_of_the_universe

So now that we know the universe is flat, and it's fate is either heath death or big rip, how will it restart?

If it collapses on itself I can see the big bang happening again, but that won't be a possibility in a flat universe.

Will we ever really know if the universe is infinite or not?

As it stands, it looks like the universe is infinite, since we see no curvature. It's flat. However, there is a margin of error, so for all we know, it's just slightly curved, and we can't detect it.

So for all we know, the universe is curved & very large, so large that we can't actually detect the curve.

We're in the same position as a sheep farmer trying to determine if the earth is flat. When he looks around his pastures, he doesn't really see any curvature. And he can never go far enough away to detect any actual curvature. And while ancient Egyptians discovered that the earth was curved, if the earth were much much larger, then they never would have been able to tell, and would have had to assume that the earth is flat.

Yo i was wondering if the universe could be a sphere, just like before oceans exploration and they thought earth was flat. Could it be a sphere? with no way to get out if you are not from the 4th dimension, just like everything in the sky at night, every planet is a sphere, galaxies gather and make a circle paterns. I like to think that if we could travel fast enough in a straight line in the universe we would get back to the start point...

i have trouble thinking about the big bang theory as something exploded and made the universe, if it is then it would have to be EXTREMELY enormous "thing" that exploded to make all the galaxies and the atoms in the universe and even there, what created that extremely enormous thing ... its beyond my understanding or are we living in a simulated universe created by some advanced super Artifical intelligence and even there, who created them?

I want to know where everything came from, so let me know what you think about the subject. We might not learn the answer but hypothesis and theories are always interesting ...

https://en.wikipedia.org/wiki/Shape_of_the_universe#Curvature_of_Universe

The curvature of space is a mathematical description of whether or not the Pythagorean theorem is valid for spatial coordinates. There are three possible curvatures the universe can have.

Flat (A drawn triangle's angles add up to 180°)
Positively curved (A drawn triangle's angles add up to more than 180°)
Negatively curved (A drawn triangle's angles add up to less than 180°)

What is the most likely shape of the universe?

Why?