Timeline for CMB absorption by interstellar medium and contamination with galactic microwave photons
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Feb 20, 2015 at 14:12 | comment | added | Jeroen | In QED it is indeed possible for photons to interact due to interactions with 'virtual' electrons, this however is quite a negligible effect. Especially when compared to the vast number of CMB photons that have an almost perfect black body spectrum there is no reason to believe that this peak at a specific wavelength arose from such $\gamma\gamma$ scattering. Furthermore, there is other independent evidence, like the distribution of elements in the early universe that points to the same conclusion of the Universe being very hot in an earlier stage, predicting the correct CMB wavelength. | |
| Jan 24, 2015 at 13:45 | comment | added | SRS | @ Georg- In J. D. Jackson's classical electrodynamics, he argued that in QED $\gamma(p_1)+\gamma(p_2)\rightarrow \gamma(k_1)+\gamma(k_2)$ is possible. The corresponding Feynman diagram is also given. Therefore why not CMB photon can interact with ordinary photons? Is this because these processes appear at higher order in perturbation and therefore the probability of interaction is highly suppressed? | |
| Jan 23, 2015 at 15:44 | comment | added | Georg | "" without any interaction with other photons coming from stars etc.?"" What makes You think that photons do interact with other photons? | |
| Jan 23, 2015 at 15:37 | comment | added | SRS | @JgL- But how is it possible to separate the photons CMB radiation from other microwave radiations? How is it possible that this CMB exists without any interaction with other photons coming from stars etc.? I find it very difficult to digest that the CMB is stable (i.e., never interact with other photons) except the CMB photons are being stretched in wavelength with the expansion of the universe? | |
| Jan 23, 2015 at 14:28 | history | edited | Jeroen | CC BY-SA 3.0 |
added 283 characters in body
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| Jan 23, 2015 at 14:20 | history | answered | Jeroen | CC BY-SA 3.0 |