|Message: Re: Faster Than Light Photons?||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
After extensive debugging, I have determined that my discrepant velocity is a result of an erroneous velocity being set by the Fresnel Refraction implementation in G4OpBoundaryProcess.
This is a result of non-physical group velocity values being calculated in G4MaterialPropertiesTable, which seems to be a result of my use of inputting indices of refraction for aluminum that are less than 1 (though still greater than zero).
My understanding was that the group velocity *could* be greater than the speed of light, and I am reasonably confident in my source for the refractive indices of Aluminum. However, I am also aware that individual photons should *not* be traveling faster than the speed of light - but the group velocity is used to set the velocity of the individual photons.
Does "group velocity" mean something different in Geant4 than I think it does? Should I simply force my refractive indices to 1 if they are actually less than 1?
Thanks everyone for your help, Joel
|Inline Depth:||Outline Depth:||Add message:|