Physics – Quantum Physics
Scientific paper
2009-05-08
Europhys.Lett.87:31002,2009
Physics
Quantum Physics
4 pages; more explanation of background in response to EPL referee; mathematics unchanged
Scientific paper
10.1209/0295-5075/87/31002
The difference between a Klein-Gordon random field and the complex Klein-Gordon quantum field is characterized, explicitly comparing the roles played by negative frequency modes of test functions in creation and annihilation operator presentations of the two theories. The random field and the complex quantum field can both be constructed from the same creation and annihilation operator algebra, making them equivalent in that sense.
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