Report
Type I Abelian Higgs strings: evolution and Cosmic Microwave Background constraints
| العنوان: | Type I Abelian Higgs strings: evolution and Cosmic Microwave Background constraints |
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| المؤلفون: | Hindmarsh, Mark, Lizarraga, Joanes, Urrestilla, Jon, Daverio, David, Kunz, Martin |
| المصدر: | Phys. Rev. D 99, 083522 (2019) |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, High Energy Physics - Theory |
| الوصف: | We present results from the first simulations of networks of Type I Abelian Higgs cosmic strings to include both matter and radiation eras and Cosmic Microwave Background (CMB) constraints. In Type I strings, the string tension is a slowly decreasing function of the ratio of the scalar and gauge mass-squared, $\beta$. We find that the mean string separation shows no dependence on $\beta$, and that the energy-momentum tensor correlators decrease approximately in proportion to the square of the string tension, with additional O(1) correction factors which asymptote to constants below $\beta \lesssim 0.01$. Strings in models with low self-couplings can therefore satisfy current CMB bounds at higher symmetry-breaking scales. This is particularly relevant for models where the gauge symmetry is broken in a supersymmetric flat direction, for which the effective self-coupling can be extremely small. If our results can be extrapolated to $\beta \simeq 10^{-15}$, even strings formed at $10^{16}$ GeV (approximately the grand unification scale in supersymmetric extensions of the Standard Model) can be compatible with CMB constraints. Comment: 11 pages, 9 figures. v2 Discussion of previous Type I cosmic string simulations added (Ref. [36]), main results unchanged. v3 matches published version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.99.083522 |
| URL الوصول: | http://arxiv.org/abs/1812.08649 |
| رقم الانضمام: | edsarx.1812.08649 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.99.083522 |
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