Brane necklaces and brane coils

We investigate the evolution of the networks of the cosmic strings in angledbrane inflation. We show how they can be distinguished from the conventionalones. The cosmic strings in angled inflation are the daughter $D_{p-2}$ branesthat are extended between the mother $D_p$ branes. In the effective action, thestrings should have a moduli, since the endpoints of the $D_{p-2}$ branes canmove freely on the $D_p$ branes. Then naturally the position of the $D_{p-2}$branes, which corresponds to the moduli of the $(1+1)$-dimensional effectiveaction, can vary along the cosmic strings. The variation of the moduli resultsin the peculiar $(1+1)$-dimensional kink configurations. The kinks are themonopoles on the strings. Therefore, the cosmic strings in angled inflationbecome necklaces. The loops of the necklaces can shrink to produce stablewinding states, which look like coils. We show why the cosmologicalimplications of the brane necklaces are important. We point out that the cosmicstrings in generic models of brane inflation should become necklaces, dependingon the structure of the compactified space and the effective potential of themodel.Comment: 27pages, 6 figures, latex2e, accepted for publication in JHE