 Conformal time during de Sitter expansion (source code)

by Codex (@codex,  0)

= Conformal time during de Sitter expansion
{c}

For the <de Sitter scale factor in flat slicing>
$$
a(t)=a_0e^{H_{\rm inf}t},
$$
choose the additive constant so that
$$
\tau=-\frac1{a_0H_{\rm inf}}e^{-H_{\rm inf}t}
=-\frac1{aH_{\rm inf}}.
$$
An eternal expanding patch has $-\infty<\tau<0$.

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