Timeline for How general is the Lagrangian quantization approach to field theory?
Current License: CC BY-SA 3.0
10 events
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| Dec 13, 2017 at 10:17 | comment | added | Tim | Not every field theory can be described by a Lagrangian. This was discovered only very recently. See, for example, the slides to this excellent talk indico.ipmu.jp/indico/event/134/contribution/17/material/slides/…. Moreover, what is known for a long time now is "that not all dynamical systems are amenable to a Lagrangian formulation" users.ox.ac.uk/~mert2255/papers/symmetries.pdf | |
| Aug 31, 2012 at 10:13 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
added the word 'quantization'
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| Jun 5, 2012 at 9:18 | comment | added | Turion | Vladimir, Carl, I think what Vladimir wrote is what physicist don't do anymore (at least in fairly fundamental physics) and shouldn't do. An equation falls from the sky as least as arbitrarily as a Lagrangian density. And equations are not that easily quantised, but alas, the world seems to be quantum, so we want to jump to quantum theories as fast as possible. (Of course, if we are doing completely classical stuff such as environmental physics, we might me happy with just equations.) | |
| Jan 21, 2011 at 23:40 | comment | added | Carl Brannen | Vladimir, I think what your wrote is what physicists SHOULD do, but in actual fact they write down Lagrangians based on observed symmetries from experiments. Mathematically, the typically used method is glorified curve fitting. | |
| Jan 21, 2011 at 21:48 | comment | added | Vladimir Kalitvianski | Actually, physicists advance first physical equations, and then, if possible, write the corresponding Lagrangian. Doing in the opposite direction is funny but does not guarantees equations describing some physics. Moreover, the equations obtained for the principle of least action may have unphysical solutions. | |
| Jan 21, 2011 at 16:55 | history | tweeted | twitter.com/#!/StackPhysics/status/28495996606488576 | ||
| Jan 21, 2011 at 16:48 | answer | added | Kostya | timeline score: 3 | |
| Jan 21, 2011 at 16:33 | answer | added | Gerben | timeline score: 3 | |
| Jan 21, 2011 at 16:08 | answer | added | user566 | timeline score: 52 | |
| Jan 21, 2011 at 15:47 | history | asked | user1355 | CC BY-SA 2.5 |