Circular (m,n)-strings in Melvin Background
Wung-Hong Huang · arXiv (Cornell University) · 2004
By using the Born-Infeld action we show that the ring-like configurations, which are the circular bound states of m fundamental strings and n D-strings, could be prevented from collapsing by the magnetic force in the Melvin background. However, if the ratio m/n of the circular (m,n)-strings is larger then a critical value the ring will become unstable and collapse to zero radius. We make analyses to find the critical value and ring radius therein. We also show that m circular, fundamental strings and n D2-brane could become a tubular bound state which is prevented from collapsing by the magnetic force in the Melvin background, in contrast to the well known configuration of supertube which is supported by the angular momentum.