de Sitter space and Holography
de Sitter space and Holography
de Sitter space and Holography
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Any null geo<strong>de</strong>sic with respect to the conformal metric is alsonull in the conformally rescaled metricd ˜S 2 = cos 2 T l dS2 = −dT 2 + l 2 dΩ 2 d−1Therefore this coordinates system is useful for studying thecausal structure of the dS <strong>space</strong>.12