Kamis, 21 Januari 2010

GLS 200 '94



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Selasa, 01 Desember 2009

What is a guage?
I looked at the wiki article, and it's not clicking.
If someone could describe it through an illustration that would
be best.

Reply With Quote
In electrodynamics, the underlying properties of the electric and magnetic fields are described by the scalar and vector potentials. While the fields are unique for a given problem, the potentials are not. There is a degree of freedom when choosing our potentials. This causes us to define additional constraints that allow us to find unique solutions to the potentials despite their invariance on the physical solution. This allows consistency in the results and can ease calculations. The shifting of the potentials within the degrees of freedom that still give rise to the same physical fields is a gauge transformation.

One set of constraints is called the Lorenz condition. The Lorenz condition does not fully constrain the potentials but it does give rise to a reduction in the mathematics. This is because it allows us to express the scalar and vector potentials as decoupled inhomogeneous wave equations. By decoupling the potentials, it allows us to use simpler mathematical methods to derive their solutions, like using a dyadic Green's function to relate the sources to the potentials.

confused on Gravity


I'm confused! Gravity is the weakest force...right. How is it possible to hypothesize that a black hole scenario of gravitation being stong enough that nothing else can escape?
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have been published in peer-reviewed journals. Anyone can post here, subject to the guidelines listed below:

1. Papers must be from respected peer-reviewed journals. This includes Nature, Science, Physical Review Letters, The Physical Review Journals, European Physical Review, Europhysics Letters, Physics Letters, Applied Physics Letters, and Journal of Applied Physics.

2. Provide the full reference to the paper. If the paper also can be found on the web without requiring subscription (such as on the e-print ArXiv), please provide the url. In any case, the full reference to the paper in the journal must be provided. The format for the reference should be as follows:

First Author's Name et al., Journal Name, Volume number, Page/Article number, (Year).

3. Provide the full abstract to the paper. This is not necessary if the paper is also available for free on the web.

4. [Optional] Please write a brief description why you are highlighting this paper, and why it is noteworthy.

5. [Optional] If this paper is also highlighted by other services, such as AIP's Physics News Update or ScienceDaily, please provide the link to those highlights. This can be added later as they are found.

6. This thread is only meant for highlighting the paper, not as a discussion thread. Please create a different thread if you think the paper deserves some discussion or comments.

Zz.

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