Effect of reconnection probability on cosmic (super)string network density

Avgoustidis, Anastasios; Shellard, E.P.S.

doi:10.1103/PhysRevD.73.041301

Effect of reconnection probability on cosmic (super)string network density

Dec, 2005

6 pages

Published in:

Phys.Rev.D 73 (2006) 041301

e-Print:

astro-ph/0512582 [astro-ph]

DOI:

10.1103/PhysRevD.73.041301

Report number:

DAMTP-2005-133

View in:

ADS Abstract Service

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Abstract: (arXiv)

We perform numerical simulations of cosmic string evolution with intercommuting probability

P

in the range

5\times 10^{-3}\le P\le 1

, both in the matter and radiation eras, using a modified version of the Allen-Shellard code. We find that the dependence of the scaling density on

P

is significantly different than the suggested

\rho\propto P^{-1}

form. In particular, for probabilities greater than

P\simeq 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^{+0.15}_{-0.12}

. 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 incorporating the key physical mechanisms, which satisfactorily fits our results over the whole range of

P

covered by the simulations.

Note:

6 pages, 4 figures

98.80.Cq
11.25.Wx
cosmic strings
cosmic superstrings
intercommuting probability
scaling
cosmic string
string: network
scaling: density
energy: density

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