Open string pair production between two rotating D-strings occurs only for rational frequency ratios and, after the tachyon is quenched, toroidal compactification enhances the rate.
The Geometry of Fractional Branes
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By looking at fractional Dp-branes of type IIA on T_4/Z_2 as wrapped branes and by using boundary state techniques we construct the effective low-energy action for the fields generated by fractional branes, build their world-volume action and find the corresponding classical geometry. The explicit form of the classical background is consistent only outside an enhancon sphere of radius r_e, which encloses a naked singularity of repulson-type. The perturbative running of the gauge coupling constant, dictated by the NS-NS twisted field that keeps its one-loop expression at any distance, also fails at r_e.
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Dressed D-strings with Instability and Transverse Rotation: The Open String Pair Production
Open string pair production between two rotating D-strings occurs only for rational frequency ratios and, after the tachyon is quenched, toroidal compactification enhances the rate.