alpha2cen Posted February 1, 2011 Share Posted February 1, 2011 Can we make this kind of space, i.e., even electromagnetic waves can not travel? Is it impossible to make primeeval vacuum(electromagnetic waves can not travel) by using modern technology? Link to comment Share on other sites More sharing options...
John Cuthber Posted February 1, 2011 Share Posted February 1, 2011 A vacuum is nothing. What could be more primeval than that? Why do you believe this "primeeval vacuum" exists? Link to comment Share on other sites More sharing options...
ajb Posted February 1, 2011 Share Posted February 1, 2011 Can we make this kind of space, i.e., even electromagnetic waves can not travel? Is it impossible to make primeval vacuum(electromagnetic waves can not travel) by using modern technology? Classically, you think of the electromagnetic field permeating all of space. Far away from any sources the electric field has value zero. Same goes for the magnetic field, we are not near any moving charges. By definition this is the classical vacuum. Quantum mechanically, we have small fluctuations in these fields. So the vacuum is not really empty but populated by virtual particles. A "primeval vacuum" would require some forcing of the electric and magnetic field to be exactly zero whatever. This surely would not be consistent with quantum field theory? Link to comment Share on other sites More sharing options...
alpha2cen Posted February 5, 2011 Author Share Posted February 5, 2011 (edited) A vacuum is nothing. What could be more primeval than that? Why do you believe this "primeeval vacuum" exists? Let us think about this experiment. We have very closed two plates in the perfect vacuum. Between two plates strong Casimir force is affected. We pass through very narrow light beam between two plates. What kind of things happen at this experiments? I have heard Casimir force experiment was done before at Harvard Lab. But this kind of experiments have not done before. Edited February 5, 2011 by alpha2cen Link to comment Share on other sites More sharing options...
lemur Posted February 5, 2011 Share Posted February 5, 2011 What is the point of trying to create an artificial vacuum that somehow exceeds the vacuum of outer space? Doesn't it make more sense to identify where the greatest vacuum would occur in nature, e.g. near the event-horizon of a black hole, and then study the light that penetrates that space? Still, this seems like a fruitless endeavor since whatever photons do make it through outer space to Earth must necessarily travel through whatever medium they are traveling through. If light can't travel through an absolute vacuum, then we will not be able to observe any stars or galaxies that are eclipsed by such a vacuum. So what possible comparison could you ever have been an ultimate vacuum (not penetrable by photons) and a vacuum that is? The best you could do, imo, would be to theorize reasons why photons would be diverted from making it to Earth and then come up with ways to recognize the effects of those reasons in other ways. Link to comment Share on other sites More sharing options...
swansont Posted February 5, 2011 Share Posted February 5, 2011 Let us think about this experiment. We have very closed two plates in the perfect vacuum. Between two plates strong Casimir force is affected. We pass through very narrow light beam between two plates. What kind of things happen at this experiments? I have heard Casimir force experiment was done before at Harvard Lab. But this kind of experiments have not done before. Yes, the Casimir force has been demonstrated. What do you hope to demonstrate by passing a laser between the plates? Link to comment Share on other sites More sharing options...
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