On the detectability of non-trivial topologies

Details On the detectability of non-trivial topologies On the detectability of non-trivial topologies

2007-04-23

arxiv.org/abs/0704.3076v1

Phys.Rev.D77:023525,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 9 figures

Scientific paper

10.1103/PhysRevD.77.023525

We explore the main physical processes which potentially affect the topological signal in the Cosmic Microwave Background (CMB) for a range of toroidal universes. We consider specifically reionisation, the integrated Sachs-Wolfe (ISW) effect, the size of the causal horizon, topological defects and primordial gravitational waves. We use three estimators: the information content, the S/N statistic and the Bayesian evidence. While reionisation has nearly no effect on the estimators, we show that taking into account the ISW strongly decreases our ability to detect the topological signal. We also study the impact of varying the relevant cosmological parameters within the 2 sigma ranges allowed by present data. We find that only Omega_Lambda, which influences both ISW and the size of the causal horizon, significantly alters the detection for all three estimators considered here.

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