Brane necklaces and brane coils

We investigate D-term strings in angled inflation and show how they could be distinguished from conventional cosmic strings. In angled inflation, D-term strings are Dp−2 branes that are extended between Dp branes. The Dp−2 brane has a flat direction in compactified space, along which the endpoint of the Dp−2 brane can move freely on the Dp brane. Then naturally the position of the Dp−2 brane could vary along the D-term strings in the effective action, which results in peculiar (1 + 1)-dimensional kink configurations and windings defined on the world volume of the strings. The kinks on the strings are monopoles. The monopole is a Dp−2 brane that has boundaries on Dp branes and Dp−2 branes. Therefore, the D-term strings in angled inflation become necklaces. A loop of the necklace could shrink to produce a heavy winding state, which looks like a coil. Cosmological implications of brane necklaces and brane coils are important. We point out that any strings that are produced by brane creation could become necklaces and coils.