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22 papers · 1 filter
Transonic Elastic Model for Wiggly Goto-Nambu String
Brandon Carter
The hitherto controversial proposition that a ``wiggly" Goto-Nambu cosmic string can be effectively represented by an elastic string model of exactly transonic type (with energy de…
Extragalactic Large-Scale Structures behind the Southern Milky Way. - I. Redshifts Obtained at the SAAO in the Hydra/Antlia Extension
Renee C. Kraan-Korteweg, Tony P. Fairall, Chantal Balkowksi
Spectroscopic observations have been carried out for galaxies in the Milky Way with the 1.9 m telescope of the South African Astronomical Observatory (SAAO). The galaxies were sele…
Long wavelength iteration of Einstein's equations near a spacetime singularity
N. Deruelle, D. Langlois
We clarify the links between a recently developped long wavelength iteration scheme of Einstein's equations, the Belinski Khalatnikov Lifchitz (BKL) general solution near a singula…
Semi-Classical Quantization of Circular Strings in De Sitter and Anti De Sitter Spacetimes
H. J. de Vega, A. L. Larsen, N. Sanchez
We compute the {\it exact} equation of state of circular strings in the (2+1) dimensional de Sitter (dS) and anti de Sitter (AdS) spacetimes, and analyze its properties for the dif…
Mass Spectrum of Strings in Anti de Sitter Spacetime
A. L. Larsen, N. Sanchez
We perform string quantization in anti de Sitter (AdS) spacetime. The string motion is stable, oscillatory in time with real frequencies and the string…
Curvature Corrections to Dynamics of Domain Walls
Brandon Carter, Ruth Gregory
The most usual procedure for deriving curvature corrections to effective actions for topological defects is subjected to a critical reappraisal. A logically unjustified step (leadi…