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Keywords: time, proper time, global time, etc
Forum: Event and Track Management
Re: Question Global system time keeping (Mark)
Date: 22 Mar, 2003
From: Tom Roberts <Tom Roberts>

Gammas are massless and never experience proper time, so 0 is the correct value for them, always.

> I have referred to the online documentation, but I cannot seem to 
> find much on this topic. 

Geant4 is the wrong place to look. Look in a good textbook on Special Relativity. This is a physics issue, not a geant4 issue.

You probably want "laboratory time", and that would be G4Track::GetGlobalTime(). But beware of its origin if you want to compare multiple events (you can set it in your G4VUserPrimaryGeneratorAction)....

Tom Roberts

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