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LHC Spies Hints of Infant Universe
techbeat writes "The big bang machine may already be living up to its nickname, writes New Scientist. Researchers on the Compact Muon Solenoid (CMS) experiment at CERN's Large Hadron Collider near Geneva, Switzerland, have seen hints of what may be the hot, dense state of matter thought to have filled the universe in its first nanoseconds."
have seen hints of what may be the hot, dense state of matter thought to have filled the universe in its first nanoseconds.
It's truly remarkable that they can see how the universe was 5999 years, 11 months, 30 days, 23 hours, 59 minutes and 59.9999999... seconds ago!
Trolling is a art,
Turn it off! Turn it off! Dude! Turn the fucking thing off!
The LHC employs its own SPIES? That's... oh... that's not what it means. :(
LHC Spies Hints of Infant Universe
Won't someone think of the infant universe?
looks like you need to do more research... :P
full announcement (pdf)
New two-particle correlations observed in the CMS detector at the LHC
full paper (also pdf)
Observation of Long-Range, Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
They have spied indications of conditions such as those postulated to exist during the beginning of OUR universe.
Sadly, they have NOT seen indications of a NEW infant universe.
Big deal, I create a hot, dense state of matter every time I nuke a Hot Pocket.
The article seems to say that sufficiently high energy density results in free quarks. I was under the impression that the theory of the strong nuclear force demanded that all observable particles are "colorless," i.e. quarks are never free, but only appear in colorless combinations of mesons and hadrons. Could someone more knowledgeable clarify whether this phenomenon is a violation of the "nature is colorless" law, or whether the article simply does a poor job of explaining a quark-gluon plasma?
I'm not sure I understand the questions in your post; so rather than trying to answer them, I'll just post what they're actually doing at the LHC and hope that it answers your questions.
The LHC is a ring-shaped particle accelerator. It accelerates counter-rotating beams of subatomic particles (normally, protons) to extremely high energies, and arranges for the particles in the beams to "collide" in several collision halls located at various places around the ring. Fundamental particles can interact with each other in a number of ways which can result in (for example) the annihilation of the original particles and the creation of new ones. As the energy of the interaction/collision goes up, the manner of interactions available change -- that is, the nature of the fundamental forces between particles depends on the energy of their interaction. This is not speculation: we've already observed this sort of thing. At LEP (an earlier particle accelerator, also located at CERN like the LHC is), for instance, back in the 80s, we saw that at high enough energies, two fundamental forces (the electromagnetic force and the weak force) unify and become the electroweak interaction, as theorized years earlier. There are a number of reasons, mostly theoretical in nature, for why we expect similar changes to the fundamental interactions at even higher energies. So, we build accelerators that get particles moving to higher and higher speeds (energies) before allowing them to come together and interact, in order to see how they interact and whether there's evidence for the kind of new physics that people expect.
The Big Bang comes in when you consider that the expansion of the Universe reduces the energy of the particles within it. If you imagine running the film backwards, looking into the past of the Universe, you get to a state where it was so hot that the atoms in the Universe would be ionized -- we had a sea of simple nuclei and electrons, with photons interacting with them. Run the film a little forward again, and as the Universe expands and the stuff within it cools, the electrons and nuclei combine to form atoms while around the same time, the likelihood of any one photon interacting with matter drops to where most photons in the Universe are likely to fly freely through it. Those photons are what we see in the Cosmic Microwave Background -- you may have heard of that. Now, consider still earlier times in the Universe. As you run the film backward, you'll eventually get to a point where the typical energies of matter are comparable to the binding energies of nuclei. Earlier than this in the Universe's history, nucleons (protons and neutrons) could come together and form simple nuclei, while nuclei could also break up as the energies of the nucleons typically exceeded the nuclear binding energies. As the Universe expanded and cooled, it passed through this transition where the nuclei that had formed stuck around. People call this era "Big Bang Nucleosynthesis" and have done calculations of how much hydrogen, helium, lithium, etc., should have been produced that do a pretty good job of matching what astronomical observations tell us. Now consider even earlier times. As you look further back, you'll get to a time where the average energies in the Universe are comparable to the binding energies of the nucleons themselves. People use the expression "quark-gluon plasma" to refer to the state of the Universe immediately preceding the transition when nucleons form for good. This is the state of matter they're talking about in TFA. In principle, if we collide subatomic particles together at sufficiently high energies, we can recreate (in a very very very small volume of space) the conditions that existed in the Universe at that time; observing the results of the collision will hopefully tell us whether such a state can indeed exist, as we think, and what it might have been like.
But it's incorrect to think of this state as being the state of matter "immediately" after the Big Bang, because "immedia