Additions:
The description of an infinite sea of particles is problematic, practically as well as philosophically. It would have an infinite electric charge and it is not mathematically possible to stop particles interacting with the sea, creating unobserved effects. There are further problems because the concept of a sea depends on the property that each energy state can only be occupied by one particle. This cannot work for antiparticles of vector bosons which are now known to exist. I will describe an alternative interpretation, proposed independently by [[http://en.wikipedia.org/wiki/Ernst_Stueckelberg Stückelberg]] and by [[http://en.wikipedia.org/wiki/Richard_Feynman Feynman]].
Deletions:
The description of an infinite sea of particles is problematic, practically as well as philosophically. It would have an infinite electric charge and it is not mathematically possible to stop particles interacting with the sea, creating unobserved effects. There are further problems because the concept of a sea depends on the property that each energy state can only be occupied by one particle. This cannot work for antiparticles of vector bosons which are now known to exist. I will describe an alternative interpretaion, proposed independently by [[http://en.wikipedia.org/wiki/Ernst_Stueckelberg Stückelberg]] and by [[http://en.wikipedia.org/wiki/Richard_Feynman Feynman]].
Additions:
