| Gravitational Lensing by Clusters |
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| • | Previous
derivation assumes Euclidean |
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| geometry
(which WMAP says is OK!). |
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| Still
OK if the distances are angular |
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| diameter
distances (chapter 5). |
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| • | Expressing
the result in physical terms: |
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| • | So,
what is the typical size for clusters? |
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