High energy Definition and 163 Threads

in the balmer series the the higher energy level lines from the spectra are not observable using a spectroscope. is this because: they are outside the visible spectrum and the intensity of the lines at high energy levels are much lower than the lower energy lines? If any of my...

Hello all This thread is a continuation of my previous thread (https://www.physicsforums.com/showthread.php?t=122582) where some of my queries about physics curriculum at the undergraduate level were answered. Basic intro: I am getting into a Bachelors program in Electrical Engineering at...

ok this might be a stupid question, but why are high energy states unstable, like electrons in excited state, does it have some force acting on it that's pushing it down, or pulling it towards the nucleus greater when its at a higher state? Belle

I read a comment posted here last night (I'll search around for it) that said something to the effect of a large part of the physics community is unsatisfied with the way current high energy theory is conducted. I am curious if anyone can expound upon this statement for me. In what general way...

http://arxiv.org/abs/astro-ph/0505267 Lorentz violation at high energy: concepts, phenomena and astrophysical constraints Ted Jacobson, Stefano Liberati, David Mattingly 56 pages, 3 figures, Invited article for Annals of Physics "We consider here the possibility of quantum gravity induced...

Just a quick question, has any research instutute such as CERN managed to produce a new stable particle such as a neutron, or even produced and extra electron or proton as a result of colliding electrons and positrons at high energies? or are the untold ?new? but shortlived particles of such a...

ultra high energy cosmic particles?? I know there have been serveral instances where protons have been detected traveling through our atmosphere with energies in excess of 3*10^{20} eV. This means that they might cause macroscopic effects as the proton would be traveling at speeds close to C. I...

I have a few questions: 1) I read that particle physics uses accelarators and computers to compare results according to Feynman diagrams. According to the precision these diagrams may be 70 or 40000 and eventually millions to trillions all very complex to calcuate. At what point (decimal...

I'm sorry, marcus, but as you well know, strings continue to dominate high energy theory, despite your efforts to fool people into somehow doubting this. In fact, marcus, strings have gone through a number of (relatively) barren periods, the last one ending when D-branes and dualities where...

this is a really good survey of all the cosmic ray and gammaray burst news, and the new detectors planned, with some interesting physical discussion of the processes involved It is 54 pages, but only about 50 of that is text. Floyd Stecker may be the or one of the top experts in this area...

Tun, te tum, please read these thoughts I've written and commment. Consider two hydrogen atoms. As they are electrically neutral they shouldn`t be any electro-magnetic attraction. But! They do do that co-valent boding thing which fills up their electron energy states. So isn`t there an...

I want to pursue for a Ph.D in these area.

Franck Wilczek Inventory and Outlook for High Energy Physics http://arxiv.org/hep-ph/0212128 it's the summary perspective talk at the end of a large conference that took place last year does anyone know a better overview of the field's recent achievements, major challenges, and...