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Topic: Virtual particle

What are virtual particle?? How geometrically we define them?? Can we say the universe fully consists of this virtual particles??

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Re: Virtual particle

You can see following article from Scientific American for simple explanation of 'virtual particle'.

"Are virtual particles really constantly popping in and out of existence? Or are they merely a mathematical bookkeeping device for quantum mechanics?"

Link for the article is -

http://www.scientificamerican.com/article.cfm?id=are-virtual-particles-rea