DF-strings from D3$\bar{\mathbf{D}}$3 as Cosmic Strings

Abstract

We study Dirac-Born-Infeld type effective field theory of a complex tachyon and U(1)$\times$U(1) gauge fields describing a D3$\bar{\mathrm{D}}$3 system. Classical solutions of straight global and local DF-strings with quantized vorticity are found and are classified into two types by the asymptotic behavior of the tachyon amplitude. For sufficiently large radial distances, one has linearly-growing tachyon amplitude and the other logarithmically-growing tachyon amplitude. A constant radial electric flux density denoting the fundamental-string background makes the obtained DF-strings thick. The other electric flux density parallel to the strings is localized, which represents localization of fundamental strings in the D1-F1 bound states. Since these DF-strings are formed in the coincidence limit of the D3$\bar{\mathrm{D}}$3, these cosmic DF-strings are safe from inflation induced by the approach of the separated D3 and $\bar{\mathrm{D}}3$.

23 pages, 5 eps figures

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• Cosmic strings and their induced non-Gaussianities in the cosmic microwave background
• Non-Abelian (p,q) Strings in the Warped Deformed Conifold
• Electrified Fuzzy Spheres and Funnels in Curved Backgrounds
• Evolution of Tachyon Kink with Electric Field
• Cosmic D- and DF-strings from D3Dbar3: Black Strings and BPS Limit
• Relativistic Dynamics of Multi-BPS D-vortices and Straight BPS D-strings
• BPS Limit of Multi- D- and DF-strings in Boundary String Field Theory