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The (in)stability of global monopoles revisited
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The (in)stability of global monopoles revisited
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We analyse the stability of global O(3) monopoles in the infinite cut-off (or scalar mass) limit. We obtain the perturbation equations and prove that the spherically symmetric solution is classically stable (or neutrally stable) to axially symmetric square integrable or power-law decay perturbations. Moreover we show that, in spite of the existence of a conserved topological charge, the energy barrier between the monopole and the vacuum is finite even in the limit where the cut-off is taken to infinity. This feature is specific of global monopoles and independent of the details of the scalar potential.
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Cited by 1 Pith paper
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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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