p-branes
A point particle can be viewed as a brane of dimension zero,
while a string can be viewed as a brane of dimension one.
In addition to point particles and strings, it is possible to consider
higher-dimensional branes. A p-dimensional brane is generally called "p-brane".
The term "p-brane" was coined by M. J. Duff et al. in 1988;[1]
"brane" comes from the word "membrane" which refers to a two-dimensional brane.[2]
A p-brane sweeps out a (p+1)-dimensional volume in spacetime called its worldvolume. Physicists often study fields analogous to the electromagnetic field, which live on the worldvolume of a brane.[3]
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