EN
The Riemann zeta-function ζ(s) extends to an outer function in ergodic Hardy spaces on $𝕋^{ω}$, the infinite-dimensional torus indexed by primes p. This enables us to investigate collectively certain properties of Dirichlet series of the form $𝔷({a_{p}},s) = ∏_{p} (1-a_{p}p^{-s})^{-1}$ for ${a_{p}}$ in $𝕋^{ω}$. Among other things, using the Haar measure on $𝕋^{ω}$ for measuring the asymptotic behavior of ζ(s) in the critical strip, we shall prove, in a weak sense, the mean-value theorem for ζ(s), equivalent to the Lindelöf hypothesis.