Ilka Brunner, Manfred Herbst
Orientifolds and D-Branes in N=2 Gauged Linear Sigma Models
Preprint series: ESI preprints

MSC:

81T30 String and superstring theories; other extended objects , See also {83E30}

PACS: 11.25.-w
Abstract: We study parity symmetries and boundary conditions in the framework of gauged linear sigma models.
This allows us to investigate the K\"ahler 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 K\"ahler 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.