Brane facts for kids
In string theory and related theories such as supergravity theories, a brane is a physical object that generalizes the notion of a point particle to higher dimensions. Branes are dynamical objects which can propagate through spacetime according to the rules of quantum mechanics. They have mass and can have other attributes such as charge.
Mathematically, branes can be represented within categories, and are studied in pure mathematics for insight into homological mirror symmetry and noncommutative geometry.
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pbranes
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 higherdimensional branes. A pdimensional brane is generally called "pbrane".
The term "pbrane" was coined by M. J. Duff et al. in 1988; "brane" comes from the word "membrane" which refers to a twodimensional brane.
A pbrane 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.
Dbranes
In string theory, a string may be open (forming a segment with two endpoints) or closed (forming a closed loop). Dbranes are an important class of branes that arise when one considers open strings. As an open string propagates through spacetime, its endpoints are required to lie on a Dbrane. The letter "D" in Dbrane refers to Dirichlet boundary condition, which the Dbrane satisfies.
One crucial point about Dbranes is that the dynamics on the Dbrane worldvolume is described by a gauge theory, a kind of highly symmetric physical theory which is also used to describe the behavior of elementary particles in the standard model of particle physics. This connection has led to important insights into gauge theory and quantum field theory. For example, it led to the discovery of the AdS/CFT correspondence, a theoretical tool that physicists use to translate difficult problems in gauge theory into more mathematically tractable problems in string theory.
Related pages
Images for kids

A cross section of a Calabi–Yau manifold
See also
In Spanish: Brana para niños