freyar
Extradimensional Explorer
CarpBrain said:Here's a question about the Casimir force that struck me recently:
If the Casimir force is caused by lower density vacuum fluctuations, and the force causes two parallel plates to move toward one another, then where does the energy come from to do the work on the plates?
If it comes from the vacuum fluctuations, then there needs to be a corresponding decrease in energy elsewhere in the system. I'm seeing this explanation as analogous to Hawking radiation along the event horizon of a black hole, where the production of the radiation causes a mass evaporation effect on the black hole. I've been digging around the archives, but haven't found anything that satisfactorily explains this. Any thoughts from our other resident physicists?
If I remember correctly, the Casimir energy is negative and diverges as the separation vanishes. So the KE of the plates' motion should be compensated by a decrease in the Casimir energy (it gets more negative). I'll try to remember to look this up tomorrow at work.