Orientifold Planes, Type I Wilson Lines and Non-BPS D-branes
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hep-th
keywords
planesorientifoldd-branesnon-bpspuzzlevariousaddressedallowed
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There is a longstanding puzzle concerned with the existence of Op~-planes with p>=6, which are orientifold p-planes of negative charge with stuck Dp-branes. We study the consistency of configurations with various orientifold planes and propose a resolution to this puzzle. It is argued that O6~-planes are possible in massive IIA theory with odd cosmological constant, while O7~-planes and O8~-planes are not allowed. Various relations between orientifold planes and non-BPS D-branes are also addressed.
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