Linear perturbations in spherically symmetric dust cosmologies including a cosmological constant
Linear perturbations in spherically symmetric dust cosmologies including a cosmological constant
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球对称尘埃宇宙学中的线性扰动,包括宇宙学常数
DOI:
10.1088/1475-7516/2017/12/025
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发表时间:
2017
影响因子:
6.4
通讯作者:
Matthias Bartelmann
中科院分区:
文献类型:
--
作者:
Sven Meyer;Matthias Bartelmann
We study the dynamical behaviour of gauge-invariant linear perturbations in spherically symmetric dust cosmologies including a cosmological constant. In contrast to spatially homogeneous FLRW models, the reduced degree of spatial symmetry causes a non-trivial dynamical coupling of gauge-invariant quantities already at first order perturbation theory and the strength and influence of this coupling on the spacetime evolution is investigated here. We present results on the underlying dynamical equations augmented by a cosmological constant and integrate them numerically. We also present a method to derive cosmologically relevant initial variables for this setup. Estimates of angular power spectra for each metric variable are computed and evaluated on the central observer's past null cone. By comparing the full evolution to the freely evolved initial profiles, the coupling strength will be determined for a best fit radially inhomogeneous patch obtained in previous works (see [1]). We find that coupling effects are not noticeable within the cosmic variance limit and can therefore safely be neglected for a relevant cosmological scenario. On the contrary, we find very strong coupling effects in a best fit spherical void model matching the distance redshift relation of SNe which is in accordance with previous findings using parametric void models.
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DOI:
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发表时间:
2012
期刊:
影响因子:
--
作者:
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通讯作者:
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发表时间:
1999
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作者:
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影响因子:
6.4
作者:
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1990
期刊:
Physical Review D, Particles and fields
影响因子:
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2013
期刊:
影响因子:
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作者:
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通讯作者:
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