"A brane, in string theory and related theories such as supergravity theories, is a physical object that generalizes the notion of a point particle to higher dimensions"
http://en.m.wikipedia.org/wiki/Brane
"In quantum mechanics, the concept of matter waves or de Broglie waves /dəˈbrɔɪ/ reflects the wave–particle duality of matter."
http://en.m.wikipedia.org/wiki/Matter_wave