Robustness of slow contraction to cosmic initial conditions
| Autor: | Elliot Y. Davies, Frans Pretorius, William G. Cook, Anna Ijjas, Paul J. Steinhardt |
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| Rok vydání: | 2020 |
| Předmět: |
High Energy Physics - Theory
Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) COSMIC cancer database Dynamical systems theory 010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) Curvature 01 natural sciences General Relativity and Quantum Cosmology Numerical relativity Hypersurface High Energy Physics - Theory (hep-th) 0103 physical sciences Attractor Statistical physics Scaling Astrophysics - Cosmology and Nongalactic Astrophysics Physical quantity |
| Zdroj: | Journal of Cosmology and Astroparticle Physics |
| Popis: | We present numerical relativity simulations of cosmological scenarios in which the universe is smoothed and flattened by undergoing a phase of slow contraction and test their sensitivity to a wide range of initial conditions. Our numerical scheme enables the variation of all freely specifiable physical quantities that characterize the initial spatial hypersurface, such as the initial shear and spatial curvature contributions as well as the initial field and velocity distributions of the scalar that drives the cosmological evolution. In particular, we include initial conditions that are far outside the perturbative regime of the well-known attractor scaling solution. We complement our numerical results by analytically performing a complete dynamical systems analysis and show that the two approaches yield consistent results. Comment: 41 pages, 18 figures; accepted for publication in JCAP |
| Databáze: | OpenAIRE |
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