Exact String Solutions in 2+1-dimensional De Sitter Spacetime
نویسندگان
چکیده
Exact and explicit string solutions in de Sitter spacetime are found. (Here, the string equations reduce to a sinh-Gordon model). A new feature without flat spacetime analogy appears: starting with a single world-sheet, several (here two) strings emerge. One string is stable and the other (unstable) grows as the universe grows. Their invariant size and energy either grow as the expansion factor or tend to constant. Moreover, strings can expand (contract) for large (small) universe radius with a different rate than the universe.
منابع مشابه
Strings propagating in the (2+1)-dimensional black hole anti-de Sitter spacetime.
We study the string propagation in the 2+1 black hole anti de Sitter background (2+1 BH-ADS). We find the first and second order fluctuations around the string center of mass and obtain the expression for the string mass. The string motion is stable, all fluctuations oscillate with real frequencies and are bounded, even at r = 0. We compare with the string motion in the ordinary black hole anti...
متن کاملSemiclassical quantization of circular strings in de Sitter and anti-de Sitter spacetimes.
We compute the 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 different (oscillating, contracting and expanding) strings. The string equation of state has the perfect fluid form P = (γ − 1)E, with the pressure and energy expressed closely and completely in terms of elliptic functions, th...
متن کاملA pr 1 99 5 Strings and Multi - Strings in Black Hole and Cosmological Spacetimes 1
1 Research report to appear in " New developments in string gravity and physics at the Planck energy scale ". Abstract Recent results on classical and quantum strings in a variety of black hole and cosmological spacetimes, in various dimensions, are presented. The curved backgrounds under consideration include the 2 + 1 black hole anti de Sitter spacetime and its dual, the black string, the ord...
متن کاملLpthe 93-44 Multi-string Solutions by Soliton Methods in De Sitter Spacetime
Exact solutions of the string equations of motion and constraints are systematically constructed in de Sitter spacetime using the dressing method of soliton theory. The string dynamics in de Sitter spacetime is integrable due to the associated linear system. We start from an exact string solution q(0) and the associated solution of the linear system Ψ (0)(λ), and we construct a new solution Ψ(λ...
متن کاملInfinitely Many Strings in De Sitter Spacetime : Expanding and Oscillating Elliptic Function Solutions
The exact general evolution of circular strings in 2 + 1 dimensional de Sitter spacetime is described closely and completely in terms of elliptic functions. The evolution depends on a constant parameter b, related to the string energy, and falls into three classes depending on whether b < 1/4 (oscillatory motion), b = 1/4 (degenerated, hyperbolic motion) or b > 1/4 (unbounded motion). The novel...
متن کامل