= D8-brane
{c}
{title2=$p=8$}
A D8-brane is a <D-brane> with eight spatial directions and a nine-dimensional <worldvolume>. In ten-dimensional <type IIA superstring theory>, it has one transverse spatial direction, so it acts as a domain wall. Its charge is associated with a nine-form <Ramond–Ramond potential>.
The dual zero-form field strength is the <Romans mass>; its value can jump across a charged D8-brane. Consequently a D8-brane cannot simply be inserted into the elementary massless <M-theory circle duality> dictionary used for lower-dimensional IIA branes. Its gravitational matching and scalar-field profiles must be treated consistently on both sides of the wall.<Non-BPS D8-branes and Dynamic Domain Walls in Massive IIA Supergravities by A. Chamblin and others>[abstract and domain-wall formulation: D8 sources in Romans theory and matching of the two sides]{ref}
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