Gravity

[Bill Verburg]

Originally Posted by Crowbob

So are you suggesting, Bill, that because there may be multiple universes is cause enough to conclude ours doesn’t exist? This universe, the one we live in, appears to be the result of something outside this universe’s (the one we live in) physical laws.

The multiverse theory looks to me to be a clever way to rationalize the inability of quantum physics to explain how we got here. Here, in the universe we live in.

Even then, since we are talking theory, what if all those other universes also appeared from their own definitions of nothing?

Not at all but we don't know everything, what we do know is able to describe in exquisite detail the universe we do see and String Theory while not predictive does tie 3 of the 4 forces together at high energies, leaving only Gravity as a stand alone force

but

at places like CERN and the Tevetron at Batavia Ill etc there are hints of Physics beyond what we know as the current version of the Standard Model every year new Physics and observation winnows parts of theory and opens new doors, one of the most recent appears to be the absence of naked Neutrinos.

no one knows what came before the Big Bang, but there are hints

If there are other Universes, which may or may not have different Constants, then there is an overlying connection deeper in the Physics to explain them, Such an overarching principal is currently unknown.

[Crowbob]

Fascinating.

[GH85Carrera]

From what I remember, the big bang made equal amounts of anti-matter and real matter, and somehow matter managed to "win out" and still be here and all the antimatter was obliterated and the matter remained. Of course we might be in the antimatter universe and the matter was obliterated.

[Bill Verburg]

Originally Posted by GH85Carrera

From what I remember, the big bang made equal amounts of anti-matter and real matter, and somehow matter managed to "win out" and still be here and all the antimatter was obliterated and the matter remained. Of course we might be in the antimatter universe and the matter was obliterated.

The Big Bang should have created equal amounts of matter and antimatter in the early universe according to some theories but in actuality there was a slight asymmetry, ~1/1,000,000,000 this the matter seen now.

There are multiple symmetries like this that have been broken as the energy density of the universe has decreased.

In the standard model of particle physics, spontaneous symmetry breaking of the gauge symmetry associated with the electro-weak force generates masses for several particles, and separates the electromagnetic and weak forces. The W and Z bosons are the elementary particles that mediate the weak interaction, while the photon mediates the electromagnetic interaction. At energies much greater than 100 GeV(as in the early universe), all these particles behave in a similar manner. The Weinberg–Salam theory predicts that, at lower energies, this symmetry is broken so that the photon and the massive W and Z bosons emerge. In addition, fermions develop mass consistently.

Another is Chiral symmetry breaking of the strong interactions in particle physics. It is a property of quantum chromodynamics, the quantum field theory describing these interactions, and is responsible for the bulk of the mass (over 99%) of the nucleons, and thus of all common matter, as it converts very light bound quarks into 100 times heavier constituents of baryons. The approximate Nambu–Goldstone bosons in this spontaneous symmetry breaking process are the pions, whose mass is an order of magnitude lighter than the mass of the nucleons. It served as the prototype and significant ingredient of the Higgs mechanism underlying the electroweak symmetry breaking.

[flatbutt]

Originally Posted by Crowbob

What does one call something that happens outside physical laws?

Female logic?

[zakthor]

Originally Posted by Pazuzu

Inflation didn't HAVE to happen, but it did happen. That flattened the Universe (make a circle, then make the circle REALLY BIG, and the surface starts to appear flat, not curved). Inflation make the Universe appear flat, not curved. It made the somewhat chaotic stew of matter very homogeneous, since quantum fluctuations which might have appeared as very high density regions got smeared apart under inflation. The distribution of matter that because galaxies and such was spread so thin, that it is now basically equal in every direction.

I’m still not understanding. I thought everything started at a point and is expanding, space itself is growing. Suppose there were two shrubs close to gather at the beginning, about a yard from the edge of everything. Space is growing, now they’re far apart. Did the distance between those two shrubs ever increase faster than c? Is it necessary?

Is there ever a case where information travelled faster than light?

[Rusty Heap]

explained very well.

https://www.facebook.com/watch?v=2455718131237042