The Orbifolds of Permutation-Type as Physical String Systems at Multiples of c=26 IV. Orientation Orbifolds Include Orientifolds

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dc.creatorHalpern, M. B.
dc.date2007-04-27
dc.date2007-12-31
dc.date.accessioned2026-07-07T10:59:48Z
dc.date.available2026-07-07T10:59:48Z
dc.descriptionIn this fourth paper of the series, I clarify the somewhat mysterious relation between the large class of {\it orientation orbifolds} (with twisted open-string CFT's at $\hat c=52$) and {\it orientifolds} (with untwisted open strings at $c=26$), both of which have been associated to division by world-sheet orientation-reversing automorphisms. In particular -- following a spectral clue in the previous paper -- I show that, even as an {\it interacting string system}, a certain half-integer-moded orientation orbifold-string system is in fact equivalent to the archetypal orientifold. The subtitle of this paper, that orientation orbifolds include and generalize standard orientifolds, then follows because there are many other orientation orbifold-string systems -- with higher fractional modeing -- which are not equivalent to untwisted string systems.
dc.description22 pages, typos corrected
dc.identifierhttps://arxiv.org/abs/0704.3667
dc.identifierhttp://arxiv.org/abs/0704.3667
dc.identifierPhys.Rev.D76:026004,2007
dc.identifierdoi:10.1103/PhysRevD.76.026004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187527
dc.subjectHigh Energy Physics - Theory
dc.subjectMathematical Physics
dc.titleThe Orbifolds of Permutation-Type as Physical String Systems at Multiples of c=26 IV. Orientation Orbifolds Include Orientifolds
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