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Article
Report number	arXiv:0812.2880 ; CERN-PH-TH-2008-242 ; LMU-ASC 60-08
Title	Orientifolds and D-branes in N=2 gauged linear sigma models
Author(s)	Brunner, Ilka (Munich U., ASC ; Munich, Tech. U.) ; Herbst, Manfred (CERN)
Publication	2010-08
Imprint	16 Dec 2008
Number of pages	88
In:	Adv. Theor. Math. Phys. 14 (2010) 1001-1088
DOI	10.4310/ATMP.2010.v14.n4.a1
Subject category	Particle Physics - Theory
Abstract	We study parity symmetries and boundary conditions in the framework of gauged linear sigma models. This allows us to investigate the Kaehler moduli dependence of the physics of D-branes as well as orientifolds in a Calabi-Yau compactification. We first determine the parity action on D-branes and define the set of orientifold-invariant D-branes in the linear sigma model. Using probe branes on top of orientifold planes, we derive a general formula for the type (SO vs Sp) of orientifold planes. As applications, we show how compactifications with and without vector structure arise naturally at different real slices of the Kaehler moduli space of a Calabi-Yau compactification. We observe that orientifold planes located at certain components of the fixed point locus can change type when navigating through the stringy regime.
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