Cosmic D-Strings and Vortons in Supergravity
arXiv:hep-th/0606036 · doi:10.1016/j.physletb.2006.07.034
Abstract
Recent developments in string inspired models of inflation suggest that D-strings are formed at the end of inflation. Within the supergravity model of D-strings there are 2(n-1) chiral fermion zero modes for a D-string of winding n. Using the bounds on the relic vorton density, we show that D-strings with winding number n>1 are more strongly constrained than cosmic strings arising in cosmological phase transitions. The D-string tension of such vortons, if they survive until the present, has to satisfy 8πG_N μ\lesssim p 10^{-26} where p is the intercommutation probability. Similarly, D-strings coupled with spectator fermions carry currents and also need to respect the above bound. D-strings with n=1 do not carry currents and evade the bound. We discuss the coupling of D-strings to supersymmetry breaking. When a single U(1) gauge group is present, we show that there is an incompatibility between spontaneous supersymmetry breaking and cosmic D-strings. We propose an alternative mechanism for supersymmetry breaking, which includes an additional U(1), and might alleviate the problem. We conjecture what effect this would have on the fermion zero modes.
11 pages
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- Nongaussianity from Tachyonic Preheating in Hybrid Inflation
- Velocity-Dependent Models for Non-Abelian/Entangled String Networks
- Moduli Corrections to D-term Inflation
- Dirac Born Infeld (DBI) Cosmic Strings
- An Inflationary Scenario in Intersecting Brane Models
- Stability of superconducting strings coupled to cosmic strings