Analytic models for the evolution of semilocal string networks

Nunes, André S.; Avgoustidis, Anastasios; Martins, C. J. A. P.; Urrestilla, Jon

doi:10.1103/physrevd.84.063504

Cited by 14 publications

(32 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The larger number of degrees of freedom (corresponding to additional scalar fields) makes the study of these models numerically trickier since in most cases the factor limiting the size of the boxes that can be simulated is memory rather than time, but otherwise our methods are directly appicable there. Another case of interest is that of semilocal string networks: here some steps towards an accurate model calibration have been taken recently [27], and we shall return to it in a subsequent publication.…”

Section: Discussionmentioning

confidence: 99%

Scaling properties of domain wall networks

Leite

Martins

2011

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

We revisit the cosmological evolution of domain wall networks, taking advantage of recent improvements in computing power. We carry out high-resolution field theory simulations in two, three and four spatial dimensions to study the effects of dimensionality and damping on the evolution of the network. Our results are consistent with the expected scale-invariant evolution of the network, which suggests that previous hints of deviations from this behavior may have been due to the limited dynamical range of those simulations. We also use the results of very large (1024 3 ) simulations in three cosmological epochs to provide a calibration for the velocity-dependent one-scale model for domain walls: we numerically determine the two free model parameters to have the values cw = 0.5 ± 0.2 and kw = 1.1 ± 0.3.

show abstract

Section: Discussionmentioning

confidence: 99%

Scaling properties of domain wall networks

Leite

Martins

2011

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

show abstract

“…[34] a comparison between the linear and non-linear σ-model can be found, showing that they are very close. There is also a model describing the evolution of semilocal strings [67,68].…”

Section: Cmb Spectra From Defectsmentioning

confidence: 99%

Constraining topological defects with temperature and polarization anisotropies

et al. 2014

View full text Add to dashboard Cite

We analyse the possible contribution of topological defects to cosmic microwave anisotropies, both temperature and polarisation. We allow for the presence of both inflationary scalars and tensors, and of polarised dust foregrounds that may contribute to or dominate the B-mode polarisation signal. We confirm and quantify our previous statements that topological defects on their own are a poor fit to the B-mode signal. However, adding topological defects to a models with a tensor component or a dust component improves the fit around ℓ = 200. Fitting simultaneously to both temperature and polarisation data, we find that textures fit almost as well as tensors (∆χ 2 = 2.0), while Abelian Higgs strings are ruled out as the sole source of the B-mode signal at low ℓ. The 95% confidence upper limits on models combining defects and dust are Gµ < 2.7 × 10 −7 (Abelian Higgs strings), Gµ < 9.8 × 10 −7 (semilocal strings) and Gµ < 7.3 × 10 −7 (textures), a small reduction on the Planck bounds. The most economical fit overall is obtained by the standard ΛCDM model with a polarised dust component.

show abstract

“…The equation for the segment lengths was first derived in ref. [15] and the equation for the monopoles in refs. [21,22].…”

Section: Discussionmentioning

confidence: 99%

“…The results presented here are part of ongoing research by the authors, described in [11][12][13][14][15] and we refer the reader to those papers for details. We will treat the semilocal network as a hybrid network made of local strings and global monopoles.…”

Section: Introductionmentioning

confidence: 99%

Cosmological evolution of semilocal string networks

Achúcarro

Avgoustidis

Lopez-Eiguren

et al. 2019

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

Semilocal strings -a particular limit of electroweak strings-are an interesting example of a stable non-topological defect whose properties resemble those of their topological cousins, the Abrikosov-Nielsen-Olesen vortices. There is, however, one important difference: a network of semilocal strings will contain segments. These are 'dumbbells' whose ends behave almost like global monopoles that are strongly attracted to one another. While closed loops of string will eventually shrink and disappear, the segments can either shrink or grow, and a cosmological network of semilocal strings will reach a scaling regime. We discuss attempts to find a "thermodynamic" description of the cosmological evolution and scaling of a network of semilocal strings, by analogy with well-known descriptions for cosmic strings and for monopoles. We propose a model for the time evolution of an overall lengthscale and typical velocity for the network as well as for its segments, and some supporting (preliminary) numerical evidence.

show abstract

Analytic models for the evolution of semilocal string networks

Cited by 14 publications

References 43 publications

Scaling properties of domain wall networks

Scaling properties of domain wall networks

Constraining topological defects with temperature and polarization anisotropies

Cosmological evolution of semilocal string networks

Contact Info

Product

Resources

About