Signatures of cosmic (super-)string networks with Y-junctions?

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• Daniele Steer, APC, University Paris 7
• Monday 13 February 2012, 13:00-14:00
• CMS, Pav.B, CTC Common Room (B1.19).

If you have a question about this talk, please contact Dr Sebastien Renaux-Petel.

Cosmic superstrings are line-like objects of cosmic size which are predicted to form at the end of brane inflation in a number of string motivated models. As opposed to their field theory counterparts (“standard” cosmic strings), cosmic superstrings are thought to exist in different varieties, with a spectrum of tensions; the different strings types can meet at Y-junctions; and strings interact with each-other and themselves in new ways. These different tensions and interactions depend on the parameters of the underling superstring theory, namely $\mu_F$ and $g_s$, the fundamental string tension and coupling. Observational signatures of cosmic superstrings will therefore depend on $(\mu_F, g_s)$, with different signatures being sensitive to different combinations of these parameters. Therefore the hope is that via (at least two) observations, the parameters $\mu_F$ and $g_s$ could be pinned down. In this talk, after a brief discussion of the evolution of cosmic superstring networks with junctions, I will focus on their GW and CMB signatures (particularly discussing how these differ from those of “standard” cosmic strings). I will show how these signatures depend on the underlying parameters.

This talk is part of the Cosmology Lunch series.

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