Timeline for Why is the bandwidth of a 'monochromatic' laser beam not zero?
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| Nov 17, 2018 at 22:25 | comment | added | Philip Oakley | While the argument is good in 1+1d (amplitude vs time), it is not as good in 3+1d. In the 4d case there are difference of opinion about how space time is organised (block universes and all that). The photon can only be left or right polarised, and is quaternionic, as per Maxwell, Einstein, etc. There is spare space for the 'constant frequency', fixed energy, compactly supported desires of physics... The time we observe is an ensemble of myriad events, not the 't' in the equations of the entity under investigation. | |
| Jun 26, 2017 at 18:17 | history | answered | sangstar | CC BY-SA 3.0 |