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Cosmological Evolution of Global Monopoles
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Cosmological Evolution of Global Monopoles
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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.
Forward citations
Cited by 3 Pith papers
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Constant Scaling Fails for Global Monopole Networks
Global monopole networks exhibit logarithmic growth in the number-density parameter ξ rather than constant scaling, with fractional response γ ≈ 0.5 for blue-tilted initial spectra.
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Nambu-Goldstone emissions from the cosmological evolution of global monopoles
First quantitative lattice measurement of NG boson emission from global monopoles: the spectrum peaks at the Hubble scale, the number density grows linearly with H, and the resulting pseudo-NG bosons can be dark matter.
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PBHs and GWs from Scaling Monopoles
Scaling monopoles generate PBHs via stochastic overdensities and GWs with correlated spectra, potentially with magnetically charged PBHs as a signature if the scaling ends via gauge boson mass.
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