Physical effects of massless cosmic strings

Abstract

We study massless cosmic strings which are one-dimensional objects moving with the speed of light. Perturbations of velocities of test bodies and anisotropy of cosmic microwave background generated by massless cosmic strings are analysed. These phenomena are analogous to the string wake effect and the Kaiser-Stebbins effect for standard (massive) cosmic strings. There are two regimes depending on the energy $E$ of a massless string per unit length. At low energies, $EG/c^4\ll 1$, massless and massive strings act similarly. At high energies, $EG/c^4\sim 1$, massless string effects are quite different. Our work provides a method to describe different physical phenomena on spacetimes of massless strings which take into account the presence of a parabolic holonomy.

14 pages, 4 figures

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Cited by in corpus (8)

• Explaining low l anomalies in the CMB power spectrum with resonant superstring excitations during inflation
• Massless Cosmic Strings in Expanding Universe
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• Null Cosmic Strings: Scattering by Black Holes, Optics and Spacetime Content
• Electrodynamics under Action of Null Cosmic Strings
• Massless Cosmic Strings in Spacetimes with Global Parabolic Isometries
• Gas of thin tubes of massless scalar field as a possible model of unified dark fluid
• A Note on Stress-Energy Tensor and Variational Principle for Null Strings