80 research outputs found
The circular loop equation of a cosmic string with time-varying tension in de Sitter spacetimes
In this work the equation of circular loops of cosmic string possessing
time-dependent tension is studied in the de Sitter spacetime. We find that the
cosmic string loops with initial radius , L de Sitter radius,
should not collapse to form a black holes. It is also found that in the case of
a loop of cosmic string whose tension depends on some power
of cosmic time can not become a black hole if the power is lower than a
critical value which is associated with the initial size of the loop.Comment: 6 page
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