Cosmological Evolution of Global Monopoles

Details Cosmological Evolution of Global Monopoles Cosmological Evolution of Global Monopoles

2001-03-13

arxiv.org/abs/hep-ph/0103130v2

Phys.Rev. D64 (2001) 081301

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, to appear in Phys. Rev. D (R)

Scientific paper

10.1103/PhysRevD.64.081301

We investigate the cosmological evolution of global monopoles in the radiation dominated (RD) and matter dominated (MD) universes by numerically solving field equations of scalar fields. It is shown that the global monopole network relaxes into the scaling regime, unlike the gauge monopole network. The number density of global monopoles is given by $n(t) \simeq (0.43\pm0.07) / t^{3}$ during the RD era and $n(t) \simeq (0.25\pm0.05) / t^{3}$ during the MD era. Thus, we have confirmed that density fluctuations produced by global monopoles become scale invariant and are given by $\delta \rho \sim 7.2(5.0) \sigma^{2} / t^{2} $ during the RD (MD) era, where $\sigma$ is the breaking scale of the symmetry.

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