منابع مشابه
Cosmic Strings and the String Dilaton
The existence of a dilaton (or moduli) with gravitational-strength coupling to matter imposes stringent constraints on the allowed energy scale of cosmic strings, η. In particular, superheavy gauge strings with η ∼ 1016 GeV are ruled out unless the dilaton mass mφ ∼ 100TeV, while the currently popular value mφ ∼ 1TeV imposes the bound η ∼ 3×10 11 GeV. Similar constraints are obtained for global...
متن کاملSupermassive screwed cosmic string in dilaton gravity
The early Universe might have undergone phase transitions at energy scales much higher than the one corresponding to the Grand Unified Theories (GUT) scales. Then, at these higher energy scales, the transition at which gravity separated from all other interactions, the Planck era, more massive strings called supermassive cosmic strings, could be produced, with energy of about 10GeV . The dynami...
متن کاملDilaton and axion bremsstrahlung from collisions of cosmic (super)strings
We calculate dilaton and axion radiation generated in the collision of two straight initially unexcited strings and give a rough cosmological estimate of dilaton and axion densities produced via this mechanism in the early universe.
متن کاملCosmic censorship and the dilaton.
We investigate extremal electrically charged black holes in Einstein-Maxwell-dilaton theory with a cosmological constant inspired by string theory. These solutions are not static, and a timelike singularity eventually appears which is not surrounded by an event horizon. This suggests that cosmic censorship may be violated in this theory.
متن کاملCosmic Strings and Cosmic Supertrings
In these lectures, I review the current status of cosmic strings and cosmic superstrings. I first discuss topological defects in the context of Grand Unified Theories, focusing in particular in cosmic strings arising as gauge theory solitons. I discuss the reconciliation between cosmic strings and cosmological inflation, I review cosmic strings dynamics, cosmic string thermodynamics and cosmic ...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1997
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.78.2288