= D0-brane
{c}
{title2=$p=0$}
A D0-brane is a point-like <D-brane> in space, with a one-dimensional <worldvolume> consisting only of time. It belongs to <type IIA superstring theory> and couples electrically to its one-form <Ramond–Ramond potential>. “Zero” counts spatial dimensions, rather than asserting zero mass or absence of dynamics.
Its mass scales as $1/(g_s\sqrt{\alpha'})$, so it is heavy at weak string coupling. Unlike an ordinary perturbative string excitation, its open-string endpoints are fixed in every spatial direction for a static brane, while the brane's own position is a dynamical collective coordinate. The low-energy description of several nearby D0-branes is quantum mechanics of their worldvolume fields; it is not a field theory with an additional extended spatial direction.<String Theory by David Tong>[chapter 3, definition of Dp-brane dimension and dynamical transverse positions; §3.1.4, type-II even/odd distinction]{ref}
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