Radiative back reaction on global strings
نویسندگان
چکیده
منابع مشابه
Back reaction of strings in self-consistent string cosmology.
We compute the string energy-momentum tensor and derive the string equation of state from exact string dynamics in cosmological spacetimes. 1+1, 2+1 and D-dimensional universes are treated for any expansion factor R. Strings obey the perfect fluid relation p = (γ − 1)ρ with three different behaviours: (i) Unstable for R → ∞ with growing energy density ρ ∼ R2−D, negative pressure, and γ = (D − 2...
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Global topological defects produce nonzero stress-energy throughout spacetime, and as a result can have observable gravitational influence on surrounding matter. Gravitational effects of global strings are used to place bounds on their cosmic abundance. The minimum separation between global strings is estimated by considering the defects’ contribution to the cosmological energy density. More ri...
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In this note we present global string solutions which are a generalization of the usual field theory global vortices when the kinetic term is DBI. Such vortices can result from the spontaneous symmetry breaking in the potential felt by a D3-brane. In a previous paper (hep-th/0706.0485), the DBI instanton solution was constructed which develops a ”wrinkle” for stringy heights of the potential. A...
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We examine the possibility that time dependence might remove the singular nature of global string spacetimes. We first show that this time dependence takes a specific form – a de-Sitter like expansion along the length of the string and give an argument for the existence of such a solution, estimating the rate of expansion. We compare our solution to the singular Cohen-Kaplan spacetime. PACS num...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1996
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.53.1811