Energy Radiation by Cosmic Superstrings in Brane Inflation

Abstract

The dominant method of energy loss by a loop of cosmic D-strings in models of warped brane inflation is studied. It is shown that the energy loss via Ramond-Ramond field radiation can dominate by many orders of magnitude over the energy radiation via gravitational wave emission. The ratio of these two energy loss mechanisms depends on the energy scale of inflation, the mass scale of string theory and whether it is a single-throat or a multi-throat inflationary scenario. This can have important consequences for the detection of cosmic superstrings in the near future. It is argued that the bounds from cosmic microwave background anisotropies and big bang nucleosynthesis are the dominant cosmological sources to constrain the physical parameters of the network of cosmic superstrings, whereas the role of the gravitational wave-based experiments may be secondary.

8 pages, no figure, added references, minor changes

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• Cusps on cosmic superstrings with junctions
• Zipping and Unzipping of Cosmic String Loops in Collision
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• Gravitating (field theoretical) cosmic (p,q)-superstrings
• Detection of cosmic superstrings by geodesic test particle motion
• Cosmic Super-Strings and Kaluza-Klein Modes
• Cosmic superstring trajectories in warped compactifications
• Cosmic Strings Collision in Cosmological Backgrounds
• Stability of superconducting strings coupled to cosmic strings
• On the Number of Cosmic Strings
• Periodic Fast Radio Bursts from Axion Emission by Cosmic Superstrings
• PhD Thesis: String theory in the early universe
• Inflation and cosmic (super)strings: implications of their intimate relation revisited