TL;DR
This paper computes the full spectrum of D-branes in Z2 orientifolds, revealing stable non-BPS branes with various charges, and explores a new K-theory framework relevant to orientifold backgrounds.
Contribution
It introduces a new K-theory approach tailored to orientifolds and provides a comprehensive calculation of D-brane spectra in Z2 orientifold models.
Findings
Stable non-BPS D-branes with integral and torsion charges identified
A new K-theory framework relevant to orientifolds proposed
Complete D-brane spectrum in Z2 orientifolds computed
Abstract
The complete D-brane spectrum in orientifolds is computed. Stable non-BPS D-branes with both integral and torsion charges are found. The relation to K-theory is discussed and a new K-theory relevant to orientifolds is suggested.
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