Large hadron collider Definition and 105 Threads

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...

I'm an engineer. What's luminosity? I don't understand the explanation of Wikipedia. Why are physics glad if the luminosity grows up in LHC, respect of last year?

Latest results from the LHC are casting doubt on the theory of supersymmetry http://www.scientificamerican.com/article.cfm?id=beautiful-theory-collides "I'm wouldn't say I'm concerned," says John Ellis, a theorist at CERN, Europe's particle-physics lab near Geneva, who has worked on...

I kind of overheard an discussion over at another forum regarding this, but none could seem to find a reliable source to verify it. The only thing I could find is information from page 1 at the LHC Portal saying that the might "skip" the planned stop during 2012 and perhaps even increase...

Is there any LHC News Well the LHC has been running at 7TeV for 6 months now and everything seems very quite, is it still too early to hear of discoveries? I have searched the LHC site and the web but there nothing out there. I presume that Higgs has not been found?

I posted an LHC question a while back but did not get a reply. I'll ask a somewhat different, simplified and more specific question. I hope I am asking the question correctly. How much inward radial force is needed to keep a proton going in a 27 km circular path at 7 Tev or a Lorentz factor...

Are there any early results from the LHC? If so what have they seen?

Hello, I was reading the quote below in a safety debate and I had a question. It is generally accepted that flux density is not a safety issue, why is that? One would think that the more energy one fits into one place at a certain time, the more energetic the situation is. Like when you use a...

I don't think it's held together with wooden dowlings though... [PLAIN]http://proofmathisbeautiful.tumblr.com/photo/1280/2687892547/1/tumblr_letrbfSKMZ1qavazm http://proofmathisbeautiful.tumblr.com/post/2687892547/centaurismymentaur-if-ikea-made-instructions

I am aware that the LHC accelerates subatomic particles to just under the speed of light then smashes them together. However, at the time of collision, would this mean that the combined speed of the impacting particles is almost two times the speed of light? Or are the particles individually...

So I am making plans to visit my sister in Switzerland this spring (around April or May?) and was excited to discover that we will be actually very close to the Large Hadron Collider! I immediately started wondering if there was some way to take a trip over there. Not sure where best on PF to...

Hello everyone, Ummm... question that I was asked by one of my children which i just cannot answer... With the LHC running with a beam of highly accelerated protons whizzing around... what would be the effect if they were able to impinge on someone (or something). Seeing as they are moving so...

Ok when they say things such as teraelectronvolts i don't know what sort of context that applies to. like are they pumping that much energy into the magnets or what are they doing with all those electron volts its confusing. like what do they mean when they say beam x number of...

Are collisions with the energy levels of LHC happening in our modern day Universe? Like at the core of stars or at the event horizon of black holes where a lot of high energy stuff is going on? Sorry for the naive question, I'm extremely interested in physics but I'm just not proficient...

Can we use energy in LHC collisions?

See http://physicsworld.com/cws/article/news/44305 Bob S

The LHC accelerates protons and lead ions. Are all the electrons stripped from the lead ions? If so, could lead ions with some electrons still be accelerated? Would there be any reason to? Could the LHC accelerate alpha particles or other nuclei? Why lead ions over lighter or heaver...

Ok, so most of us are probably familiar with the micro-black hole fears that were pretty baseless. There is a new angle on the LCH doomsday scenario, involving the production of strangelets, which will allegedly produce a catastrophic "ice-9" reaction, flipping all the quarks on Earth or some...

I am hoping to visit CERN at some point, but the underground areas are closed off at the moment. So just wondering if anyone knows when it's open to the public again Thanks :)

Hi all, I'm writing a sci-fi story for a competition, are there any more realistic ideas of what accident can LHC cause that has massive impact on the whole earth? currently, my idea is the formation of massive black holes from quantum ones which led to the Earth being swallowed. How...

The ATLAS experiment has recently sent two papers for publication. Both look for evidence of quark substructure, in two different ways. http://arxiv.org/abs/1008.2461" , submitted to Physical Review Letters, looks for an excited quark, and does not see any evidence of one. Based on that...

Hello everyone, Quick question: Which particles are colliding at the LHC and why? All I know is that proton-proton collisions are explored as well as heavier nuclei such as gold (Au) and lead (Pb) to research the quark-gluon plasma state. -Hioj

http://cms.web.cern.ch/cms/News/2010/QCD-10-002/ http://motls.blogspot.com/2010/09/lhc-probably-sees-new-shocking-physics.html http://cms.web.cern.ch/cms/News/2010/QCD-10-002/CERN_seminar_QCD-10-002_introduction.pdf pg 14

FYI. You can watch LHC ops in realtime here. Currently ramping. http://op-webtools.web.cern.ch/op-webtools/vistar/vistars.php?usr=LHC1

Technicolor models offer ways to break EWB that do not involve higgs, but do predict new observations at LHC energies. Based on precision WW scattering, unitarity would be violated without the Higgs mechanism. So if the Higgs, or something that plays its role, is not found, unitarity is...

The canceled Superconducting Super Collider had 3x beam energy of 40TEV vs LHC 14TEV. While it has been cancelled, could it be re-started 20-30 years after LHC hits diminishing returns in the future? Is there any new expected physics in SSC range over and above LHC that would make it worth...

LHC thus far has ruled out some of the SUSY parameter space over and above Tev, esp gluinos above a certain mass. So LHC has offered some useful research into SUSY. Were SUSY gluinos detected it would be a huge boost to strings/Supergravity Beyond the Standard Model...

Is charge conserved in the remains of the collision?

hi, i like a practical approach to everything (as you can see very clearly in this thread, https://www.physicsforums.com/showthread.php?t=411875) so i will ask this question: when the lhc is running and colliding particles, if you stood in it, would you see the reaction occurring?, if so...

Considering they will eventually be colliding gold or lead ions, will they measure or be able to measure the gravitational impact of the collisions? Just curious since the velocity will be so extreme. I would think Tevatron would already have something to say about this, but I'm unsure of...

I went to see the LHC (my version of a pilgrimage to Mecca). I bought a tshirt with a formula on it, but I can't find any information on what the formula describes. http://www.facebook.com/photo.php?pid=4005975&l=cc76e7a9d7&id=529304037 hopefully, that link works, if not I can tell you...

Thought some might enjoy this, I thought it was a cool video including the synthesizer's voice... Reminds me vaguely of Stephen Hawking's... Even if you are not familiar with all phases of the cycle, watching this video gives you a rough idea of the time intervals to inject (with retries...

Hi! What are the most exciting potentials for current and future experiments done at the LHC? Really, I'd like to know what type of impact we can expect to see at a practical level. Any new technologies that may arise from these studies? How will studies at LHC affect our every-day world...

First, the assembly, time lapsed of course... http://www.youtube.com/watch?v=kVrUR_SOykk&feature=related" This is a blow up of the Transition Radiation, Semi-conductor and Pixel Detectors, innermost Atlas detectors. Description of layers of detectors and what each one is...

Moved from locked thread. Stany asked: 1: That was about creating mini black holes, not worm holes. 2: Although the maths was not provably impossible, it is not yet clear whether mini-black holes can be created in practice except by evaporation from not-so-mini BHs which is a SLOOOOOW...

Is there a "black box recorder" at the LHC? To explain the question further: are there real-time records of exactly what's going on and/or voice recorders, analogous to what there are in commercial jets? If there were to be a major catastrophe at the LHC, they would need to know precisely what...

Hello, I'm new here, and I guess I should give a brief intro.I'm in high school, and I have some interest in physics.A lot of it, in fact.I signed up because the fear mongering over the LHC led me to seek some answers, and I guess this is as good a place as any. Well, here goes: 1) What is...

I was checking the news this morning when I happened upon this shocking story: http://ste5ens.files.wordpress.com/2009/04/april-fool-illus.jpg

This is a historical moment – CERN and Switzerland did not turn into a Black Hole! :biggrin: Here are some pictures and video from the event: The two beams getting aligned for collision...

Can anyone explain a bit how does the LHC uses magnetic filed to accelerate protons? And why does it use protons for the collision? Couldn't they have used electrons?

By what factor would the radius parallel to the direction of travel contract for a 7 TeV proton, relative to an antiparallel 7 TeV proton, in the Large Hadron Collider?

Ok, apologies if my understanding is limited or even wrong but I know I'll learn something from your replies even if my question turns out to be idiotic! Relativity gives us length contraction as we approach the speed of light but quantum mechanics gives us uncertainty as to a particles...

I watched some interesting videos on the Large Hadron Collider (LHC) and it raised a whole ton of questions. If my questions do not make any sense, perhaps the video itself, though clever and catchy, is not credible. ( http://technology.todaysbigthing.com/2008/09/11 +...

http://www.youtube.com/watch?v=qQNpucos9wc&feature=rec-HM-r2

A few days ago the Large Hadron Collider (LHC) was finished. Pretty rare no one started this topic. What you guys say about the LHC?? I hope they find the Higgs Boson and find a lot of the mysteries of the Big Bang and the universe. Here is the...

So they didn't seem to collide any particles yet? I'm not too knowledgeable about this topic, but it must be something "landmark" as Google altered their logo to inform people about this. Anyways, there's a link to the article here...

http://www.lhcountdown.com/?p=13#comments The countdown is close to the end! Anyone know when we should expect results of new (or lack of) finds? I mean public announcement. A day? A week? 72 years!?

I would like to hear what your thoughts are about the Large Hadron Collider they are going to fire up in August? Think were making a doom's day product?

Hello All This is a question from a complete physics ingnoramus, and a quick search on google brought this forum up as a good place to start! Also, apologies if I'm in the wrong bit of the forum. Right, the question. I've been reading about the Large Hadron Collider in Cern, and it keeps...

Hi, I have no academic grounding in advanced physics, but I have read a lot of the popular books on physics, and am generally interested in it. (In a couple of years that's probably what I'll learn in college). Anyway, there are people who are afraid that when the LHC goes on this summer we...