Forumi Horizont (http://www.forumihorizont.com/index.php3)
- Fizikë dhe Astronomi (http://www.forumihorizont.com/forumdisplay.php3?forumid=10)
-- the world of physics and astronomy (http://www.forumihorizont.com/showthread.php3?threadid=10080)

as far as i know(and told me) photons do not interact with each other since they have no mass...i mean pachage of energy can not interact with each other.however i cant give any proven data on this "still remaining hypothesis for me"...so adding photons inside this empty vaccum space wont make any difference in terms of entropy(the system is isolated and no energy exchange with the outer space isn't it?),as the space is empty!!!
correct me if i'm wrong here!