1樓：
This question was too broad. Very simply： In general, a p-brane is a soliton with a -dimensional world volume, so a 0-brane is a particle, a 1-brane is a string, a 2-brane is a membrane and so on.
And large and important class of topological objects can be uncovered in string theory： are the D-branes as well. For gauge fields in the Ramond–Ramond sectors：
two-forms in Type I, one-forms and three-forms in Type IIA and so on. On the other hand the D-branes could be use to charged objects that couple to these fields. Their tensions are proportional to That's it.
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