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One void, many voids, Swiss Cheese and no Dark Energy

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If you have a question about this talk, please contact Tasos Avgoustidis .

In cosmology, the evidence for Dark Energy may be striking, but there still is a good number of reasons to consider alternative explanations for the cosmological observations. The first convincing evidence for Dark Energy (DE) came from the observed distances to supernovae. I will point out in what ways one can explain the supernovae without DE, and I will focus on one particular model that does so: the Swiss-Cheese universe, which is filled with voids and intermediate homogeneous matter. I will show how the Swiss-Cheese toy model reveals severe difficulties for the inhomogeneous universe to explain away DE, because of its implications for the observed Cosmic Microwave Background. I will also briefly discuss the closely related class of models, in which we live in one local void in an otherwise homogeneous universe.

This talk is part of the Cosmology Lunch series.

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