TL;DR
This paper discusses the detailed formulation of Ramond-Ramond boundary states in type II string theories, focusing on the R-R sector's subtleties and their implications for D-brane interactions, exemplified by the D0-D8 system.
Contribution
It provides a careful analysis of R-R boundary states and vertices, clarifying their role in D-brane descriptions and interactions within covariant string theory.
Findings
Proper handling of R-R boundary states is essential for accurate D-brane descriptions.
The D0-D8 system exemplifies the microscopic interaction via R-R potential exchange.
The paper clarifies the coupling of R-R potentials to D-branes in covariant formulation.
Abstract
The description of D-branes as boundary states for type II string theories (in the covariant formulation) requires particular care in the R-R sector. Also the vertices for R-R potentials that can couple to D-branes need a careful handling. As an illustration of this, the example of the D0-D8 system is reviewed, where a ``microscopic'' description of the interaction via exchange of R-R potentials becomes possible.
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