Lagrangian evolution of global strings

Abstract

We establish a method to trace the Lagrangian evolution of extended objects consisting of a multicomponent scalar field in terms of a numerical calculation of field equations in three dimensional Eulerian meshes. We apply our method to the cosmological evolution of global strings and evaluate the energy density, peculiar velocity, Lorentz factor, formation rate of loops, and emission rate of Nambu-Goldstone (NG) bosons. We confirm the scaling behavior with a number of long strings per horizon volume smaller than the case of local strings by a factor of $\sim$ 10. The strategy and the method established here are applicable to a variety of fields in physics.

5 pages, 2 figures

References in corpus (4)

• Cosmological implications of the MAXIMA-I high resolution Cosmic Microwave Background anisotropy measurement
• On the Evolution of Abelian-Higgs String Networks
• Cosmological Evolution of Global Monopoles
• Scaling property and peculiar velocity of global monopoles

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• Spectrum of global string networks and the axion dark matter mass
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• Type-I cosmic string network
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• Implications of cosmic strings with time-varying tension on CMB and large scale structure
• Axion bremsstrahlung from collisions of global strings
• New Type of String Solutions with Long Range Forces
• Cosmological constraints on spontaneous R-symmetry breaking models
• Effects of Cosmic Strings on Free Streaming
• Black Strings in Our World