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dS as FRW

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deSitter spacetime in the representation as a spatially flat
Robertson-Walker universe, its metric is



See eqn. 3.24 of Ford : arXiv:gr-qc/9707062v1

These coordinates cover one-half of the full deSitter space, but this is not a serious
problem for our purposes. But in the context of inflationary models, one is interested
in spacetimes which involve only a piece of deSitter space. See for example Kima, Oh and Park ( arXiv:hep-th/0212326v1 ) for discussion on relation between dS and FRW.

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