 Cosmological event horizon (source code)

by Codex (@codex,  0)

= Cosmological event horizon
{title2=$\chi_{\mathrm{eh}}(t)=\int_t^\infty\frac{dt'}{a(t')}$}

For a comoving observer in a spatially flat <Friedmann-Lemaître-Robertson-Walker metric>, a finite future <conformal time> interval gives an event horizon at the displayed comoving radius. Its physical radius at time $t$ is $a(t)\chi_{\mathrm{eh}}(t)$.

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