Effect of reconnection probability on cosmic (super)string network density
- Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)
We perform numerical simulations of cosmic string evolution with intercommuting probability P in the range 5x10{sup -3}{<=}P{<=}1, both in the matter and radiation eras. We find that the dependence of the scaling density on P is significantly different than the suggested {rho}{proportional_to}P{sup -1} form. In particular, for probabilities greater than P{approx_equal}0.1, {rho}(1/P) is approximately flat, but for P less than this value it is well-fitted by a power-law with exponent 0.6{sub -0.12}{sup +0.15}. This shows that the enhancement of string densities due to a small intercommuting probability is much less prominent than initially anticipated. We interpret the flat part of {rho}(1/P) in terms of multiple opportunities for string reconnections during one crossing time, due to small-scale wiggles. We also propose a two-scale model, which satisfactorily fits our results over the whole range of P covered by the simulations.
- OSTI ID:
- 20776706
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 4; Other Information: DOI: 10.1103/PhysRevD.73.041301; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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