D3-brane
= D3-brane
{c}
{title2=$T_3=\frac1{(2\pi)^3g_s\alpha'^2}$}
A <D3-brane> has three spatial dimensions. The low-energy fields of an isolated flat <D3-brane> form an abelian theory with sixteen linearly realized <supersymmetry generators>. Its transverse scalar fields describe its geometric position, and its gauge field can carry the charges of strings ending on it.