On 9/6/2012 4:11 PM, Stephen P. King wrote:
On 9/6/2012 1:21 PM, Bruno Marchal wrote:

On 05 Sep 2012, at 18:15, Roger Clough wrote:

Hi Bruno Marchal
Perhaps wrongly, I think of the world of monads as the virtual world.

Virtual means simulated by a computer, in computer science.
It has another meaning in physics, which I have never make complete sense of, as it is unclear if the sense in classical physics and quantum physics can be said equivalent.


Dear Bruno,

This might explain your attitude toward QM. The "virtual" concept in QM is a way of representing the "off mass shell" quantities that do not exist at all in classical physics. There are many measured effects what depend on the reality of the "virtual" aspect to be explained quantitatively. For example http://en.wikipedia.org/wiki/Lamb_shift and http://en.wikipedia.org/wiki/Fine_structure_constant <http://en.wikipedia.org/wiki/Fine_structure_constant>competely depend on this virtual effect.

I was wondering what classical physics use of 'virtual' Bruno referred to. The only one I can think of is 'virtual image' in optics.


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