TL;DR
This paper reviews recent progress in understanding non-BPS states and branes in string theory, focusing on their construction, stability, and spectrum in various configurations and backgrounds.
Contribution
It provides a comprehensive overview of the construction and analysis of non-BPS D-branes and their spectra across different string theory setups.
Findings
Construction of unstable non-BPS D-branes in type IIA/IIB
Stable non-BPS D-branes on orbifolds and orientifolds
Spectrum analysis of non-BPS states in brane systems
Abstract
We review the recent developments in our understanding of non-BPS states and branes in string theory. The topics include 1) construction of unstable non-BPS D-branes in type IIA and type IIB string theories, 2) construction of stable non-BPS D-branes on various orbifolds and orientifolds of type II string theories, 3) description of BPS and non-BPS D-branes as tachyonic soliton solutions on brane-antibrane pair of higher dimension, and 4) study of the spectrum of non-BPS states and branes on a system of coincident D-brane - orientifold plane system. Some other related results are also discussed briefly.
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