منابع مشابه
Collisions of Cosmic F- and D-strings
Recent work suggests that fundamental and Dirichlet strings, and their (p, q) bound states, may be observed as cosmic strings. The evolution of cosmic string networks, and therefore their observational signals, depends on what happens when two strings collide. We study this in string perturbation theory for collisions between all possible pairs of strings; different cases involve sphere, disk, ...
متن کاملCosmic F- and D-strings
Macroscopic fundamental and Dirichlet strings have several potential instabilities: breakage, tachyon decays, and confinement by axion domain walls. We investigate the conditions under which metastable strings can exist, and we find that such strings are present in many models. There are various possibilities, the most notable being a network of (p, q) strings. Cosmic strings give a potentially...
متن کاملIntroduction to Cosmic F-and D-strings
In these lectures I discuss the possibility that superstrings of cosmic length might exist and be observable. I first review the original idea of cosmic strings arising as gauge theory solitons, and discuss in particular their network properties and the observational bounds that rule out cosmic strings as the principal origin of structure in our universe. I then consider cosmic superstrings, in...
متن کاملCosmic D-strings as Axionic D-term Strings
In this work we derive non-singular BPS string solutions from an action that captures the essential features of aD−brane-anti-D−brane system compactified to four dimensions. The model we consider is a supersymmetric abelian Higgs model with a D−term potential coupled to an axion-dilaton multiplet. The strings in question are axionic D−term strings which we identify with the D−strings of type II...
متن کاملFormation and Evolution of Cosmic D-strings
We study the formation of D and F -cosmic strings in D-brane annihilation after brane inflation. We show that D-string formation by quantum de Sitter fluctuations is severely suppressed, due to suppression of RR field fluctuations in compact dimensions. We discuss the resonant mechanism of production of D and F -strings, which are formed as magnetic and electric flux tubes of the two orthogonal...
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ژورنال
عنوان ژورنال: Comptes Rendus Physique
سال: 2004
ISSN: 1631-0705
DOI: 10.1016/j.crhy.2004.10.002