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In theoretical physics, an M2-brane, is a spatially extended mathematical object that appears in string theory and in related theories (e.g. M-theory, F-theory). In particular, it is a solution of eleven-dimensional supergravity which possesses a three-dimensional world volume.


The M2-brane solution can be found[1] by requiring (Poincare)_{3}\times SO(8) symmetry of the solution and solving the supergravity equations of motion with the p-brane ansatz. The solution is given by a metric and three-form gauge field which, in isotropic coordinates, can be written as

 \begin{align} ds^{2}_{M2} &= \left(1+\frac{q}{r^{6}}\right)^{-\frac{2}{3}}dx^{\mu} dx^{\nu}\eta_{\mu\nu} + \left(1+\frac{q}{r^{6}}\right)^{\frac{1}{3}}dx^{i}dx^{j}\delta_{ij} \\
F_{i\mu_{1}\mu_{2}\mu_{3}} &= \epsilon_{\mu_{1}\mu_{2}\mu_{3}} \partial_{i}\left(1+\frac{q}{r^6}\right)^{-1}, \quad \mu=1,\ldots ,3 \quad i=4,\ldots , 11,\end{align}

where \eta is the flat-space metric and the distinction has been made between world volume x^\mu and transverse x^i coordinates. The constant q is proportional to the charge of the brane which is given by the integral of F over the boundary of the transverse space of the brane.[2]

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