Do the conditions created by the LHC accurartely simulate the big bang?

[BernieM]

The LHC is supposed to create conditions similar to the big bang. Although energy densities, temperatures and other conditions may be similar to those theorized in the big bang and soon thereafter, are the conditions of space and time the same now as then? If time and or space were fundamentally different at the moment of the big bang than today, wouldn't the results in our current 'space/time' conditions yield different results than the big bang if there were fundamental differences?

 

[bcrowell]

One way of stating the equivalence principle is that *locally*, the properties of time and space are always exactly the same.

The properties of *matter*, on the other hand, can vary. There are certainly ways in which an LHC collision does not exactly mimic the conditions at a certain time shortly after the Big Bang when, say, the temperature was the same. For example, the net charge density in an LHC collision is positive, but in the early universe it was zero.

-Ben

 

[BernieM]

Supposing that some of the current ideas are correct, for example, that at the moment of the big bang space was 1 dimensional, then it might be possible that the particles being created today in 3d space are not what were created in the big bang.

 

[Nabeshin]

Supposing that some of the current ideas are correct, for example, that at the moment of the big bang space was 1 dimensional, then it might be possible that the particles being created today in 3d space are not what were created in the big bang.

Wait, what? 1-dimensional objects are lines. Assuming you actually meant 0-dimensional, which are points, this is still a ridiculous thing to claim.

The fact is, discussing the "moment of the big bang" is meaningless. Within the context of GR, this is a singular point so the theory breaks down. Assuming some quantum gravity corrections, the singularity is likely removed so there is no "moment of big bang". Either way, you can only discuss things about the moments after the event.

 

[bcrowell]

Supposing that some of the current ideas are correct, for example, that at the moment of the big bang space was 1 dimensional, then it might be possible that the particles being created today in 3d space are not what were created in the big bang.

If there were radical changes in the structure of spacetime, that would have been at earlier times than the times simulated by the LHC. As Nabeshin has pointed out, it's necessary to be more precise about the time after the Big Bang that you're talking about.

 

[BernieM]

"Last year, Landsberg and colleagues suggested a simpler way to let the standard model live on at high energies: Have a universe with vanishing dimensions. If the hot infant universe had only one spatial dimension and acquired more as it expanded and cooled, some of the most intractable problems in physics disappear."

http://www.wired.com/wiredscience/2011/03/vanishing-dimensions/#

 

[M. Bachmeier]

No t=0, too much energy. After t>0 maybe.