Nonlinear approximation for perturbations in ΛCDM
We describe inhomogeneities in a ΛCDM universe with a gradient series expansion and show that it describes the gravitational evolution far into the nonlinear regime and beyond the capacity of standard perturbation theory at any order. We compare the gradient expansion with exact inhomogeneous ΛLTB s...
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| Main Authors: | , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
2012
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| In: |
Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2012, Volume: 86, Issue: 4 |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.86.043523 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.86.043523 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.86.043523 
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| Author Notes: | Gerasimos Rigopoulos and Wessel Valkenburg |
MARC
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| 520 | |a We describe inhomogeneities in a ΛCDM universe with a gradient series expansion and show that it describes the gravitational evolution far into the nonlinear regime and beyond the capacity of standard perturbation theory at any order. We compare the gradient expansion with exact inhomogeneous ΛLTB solutions (Lemaître-Tolman-Bondi metric with the inclusion of a cosmological constant) describing growing structure in a ΛCDM universe and find that the expansion approximates the exact solution well, following the collapse of an over-density all the way into a singularity. | ||
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