2 research outputs found
The circular loop equation of a cosmic string with time-varying tension
The equation of circular loops of cosmic string with time-dependent tension
is studied in the Minkowski spacetime and Robertson-Walker universe. We find
that, in the case where the tension depends on some power of the cosmic time,
cosmic string loops with time-varying tension should not collapse to form a
black hole if the power is lower than a critical value.Comment: 8 pages, 3 figures. accepted by Modern Physics Letters
The evolution of cosmic string loops in Kerr-de Sitter spacetimes
The equation of cosmic string loops in Kerr-de Sitter spacetimes is derived.
Having solved the equation numerically, we find that the loops can expand and
exist except for too small ones.Comment: 8 page