Dynamics of FD networks the role of bound states.pdfVIP

Dynamics of F/D networks: the rˆole of bound states Mairi Sakellariadou1 and Horace Stoica2 8 1 Department of Physics, King’s College London, London WC2R 2LS, U.K. 0 0 E-mail: Mairi.Sakellariadou@kcl.ac.uk 2 2 Blackett Laboratory, Imperial College London, SW7 2AZ U.K. n E-mail: mairi.sakellariadou@kcl.ac.uk, f.stoica@imperial.ac.uk u J 9 Abstract. 1 We study, via numerical experiments, the rˆole of bound states in the evolution of ] cosmic superstring networks, being composed by p F-strings, q D-strings and (p, q ) h bound states. We find robust evidence for scaling of all three components of the t - network, independently of initial conditions. The novelty of our numerical approach p consists of having control over the initial abundance of bound states. This indeed e h allows us to identify the effect of bound states on the evolution of the network. Our [ studies also clearly show the existence of an additional energy loss mechanism, resulting 1 to a lower overall string network energy, and thus scaling of the network. This new v mechanism consists of the formation of bound states with an increasing length. 9 1 2 3 PACS numbers: 11.27.+d, 98.80.Cq . 6 0 8 0 Submitted to: JCAP : v i X 1. Introduction r a Cosmic superstrings can be formed as a result of brane annihilations in the context of brane-world scenario [1, 2, 3]. In the brane-world models, brane inflation takes place [4] while