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[SD] First-Ever Model Simulation of the Structuring of the Observable Universe

post #1 of 15
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Quote:
ScienceDaily (Apr. 12, 2012) — A team of researchers from the Laboratoire Univers et Théorie (LUTH, Observatoire de Paris/CNRS/Université Paris Diderot)(1) coordinated by Jean-Michel Alimi has performed the first-ever computer model simulation of the structuring of the entire observable universe, from the Big Bang to the present day. The simulation has made it possible to follow the evolution of 550 billion particles. This is the first of three runs which are part of an exceptional project called Deus : full universe run (2), carried out using GENCI's new supercomputer CURIE at the CEA's Très Grand Centre de Calcul (TGCC).
http://www.sciencedaily.com/releases/2012/04/120412133058.htm

Cool, no? I thinks so.
post #2 of 15
What I don't understand- If the simulation is guided by math derived from observation, what is to be gained from running this? We don't know what dark matter is, all we know is that it contributes extra gravitational pull that observable matter doesn't fully explain and we don't know what dark energy is, we just know that it's what results in the currently unexplainable acceleration of the universe's expansion. If those forces are programmed in, what information does seeing that simulated result in?

To me, it seems like making a physics simulator and setting the acceleration of gravity to -9.8m/s^2, running it, and saying "look! the acceleration of gravity is -9.8m/s^2!" What am I missing?
Edited by aroc91 - 4/12/12 at 10:04pm
    
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post #3 of 15
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Quote:
Originally Posted by aroc91 View Post

What I don't understand- If the simulation is guided by math derived from observation, what is to be gained from running this? We don't know what dark matter is, all we know is that it contributes extra gravitational pull that observable matter doesn't fully explain and we don't know what dark energy is, we just know that it's what results in the currently unexplainable acceleration of the universe's expansion. If those forces are programmed in, what information does seeing that simulated result in?
To me, it seems like making a physics simulator and setting the acceleration of gravity to -9.8m/s^2, running it, and saying "look! the acceleration of gravity is -9.8m/s^2!" What am I missing?

Well, think about how in tornado science we're striving to get a fantastic mathematical model of a tornado. We can use it to run the simulation backwards to get some insights on the root causes of a tornado so we can better predict them. Getting some insights into the forces that went into the big bang and right after it would be some awesome info, no? Kinda like how Einstein's theory of relativity gave us insights into a lot of other things OTHER than gravity, this model could give us some possible explanations for forces we still don't know anything about, or even possibly things we may have yet to discover through observation.
post #4 of 15
So... the universe is larger than they can see and as such while I liken it to a cool picture, I liken it to a partially finished Picasso.

What if there are billions of galaxies even farther back than the galaxies we already know to be the oldest currently visible (or not visible) that are only echos of something more than the universe itself?! thinking.gif
    
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post #5 of 15
no need for completeness and inclusion of every minor variable or factor in a model.
post #6 of 15
Quote:
Originally Posted by aroc91 View Post

What I don't understand- If the simulation is guided by math derived from observation, what is to be gained from running this? We don't know what dark matter is, all we know is that it contributes extra gravitational pull that observable matter doesn't fully explain and we don't know what dark energy is, we just know that it's what results in the currently unexplainable acceleration of the universe's expansion. If those forces are programmed in, what information does seeing that simulated result in?
To me, it seems like making a physics simulator and setting the acceleration of gravity to -9.8m/s^2, running it, and saying "look! the acceleration of gravity is -9.8m/s^2!" What am I missing?

We know the Universe now, so, if this simulator correctly simulates it's structuring, it tells us we know enough about matter and energy in our universe...if it doesn't, we learn where the gaps are, and that might give us insight into some properties of dark matter, or other unanticipated phenomena.
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post #7 of 15
Quote:
Originally Posted by dontpwnmebro View Post

no need for completeness and inclusion of every minor variable or factor in a model.

I actually believe this is essential. Think about the butterfly effect.
post #8 of 15
Quote:
Originally Posted by GanjaSMK View Post

So... the universe is larger than they can see and as such while I liken it to a cool picture, I liken it to a partially finished Picasso.
What if there are billions of galaxies even farther back than the galaxies we already know to be the oldest currently visible (or not visible) that are only echos of something more than the universe itself?! thinking.gif

The point of the observable universe is that it's just than - the observable universe.

We can't see any further as the light hasn't reached us yet.

However, seeing as the observable universe is isotropic and homogeneous, we can assume that anything beyond the observable universe is pretty much more of the same tongue.gif
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post #9 of 15

Interesting.

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post #10 of 15
Quote:
Originally Posted by aroc91 View Post

What I don't understand- If the simulation is guided by math derived from observation, what is to be gained from running this? We don't know what dark matter is, all we know is that it contributes extra gravitational pull that observable matter doesn't fully explain and we don't know what dark energy is, we just know that it's what results in the currently unexplainable acceleration of the universe's expansion. If those forces are programmed in, what information does seeing that simulated result in?
To me, it seems like making a physics simulator and setting the acceleration of gravity to -9.8m/s^2, running it, and saying "look! the acceleration of gravity is -9.8m/s^2!" What am I missing?

This. We need to understand what certain things are before making a model that won't even be accurate.
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