Branes and Strings

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In addition to strings, string theories contain objects called "p-branes" that are essentially p-dimensional membranes on which strings can be confined. Strings can be closed loops that move around in the various dimensions, or they can break open and end on a p-brane. These open strings give rise to particles that only exist on the p-brane. It is possible that the world we live in is a 3-brane embedded in a higher dimensional space, and that the particles and forces we know are the product of open strings. (Unit: 4)