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We analyze the problem of calculating the solutions and the spectrum of a string with arbitrary density and fixed ends. We build a perturbative scheme which uses a basis of WKB-type functions and obt...
Timelike and Spacelike Ricci Collineation Vectors in String Fluid
Ricci Collineation String String Fluid
2010/4/13
We study the consequences of the existence of timelike and spacelike Ricci collineation vectors (RCVs) for string fluid in the context of general relativity. Necessary and sufficient conditions are de...
Null string in curved backgrounds
null string Lagrange theory Hamilton theory cosmological background
2010/4/14
We consider null string in curved backgrounds. Some exact solutions of the classical equations of motion and of the constraints for the null string in a large class of cosmological backgrounds are fou...
Some String Cosmological Models in Cylindrically Symmetric Inhomogeneous Universe
String Cosmological Models
2010/4/15
The aim of this paper is to investigate the behavior of a string in the cylindrically symmetric inhomogeneous cosmological model. It has been assumed that expansion q in the model is proportional to s...