Inflationary Correlation Functions without Infrared Divergences
  Inflationary correlation functions are potentially affected by infrared
divergences. For example, the two-point correlator of curvature perturbation at
momentum k receives corrections ~ln(kL), where L is the size of the region in
which the measurement is performed. We define infrared-safe correlation
functions which have no sensitivity to the size L of the box used for the
observation. The conventional correlators with their familiar log-enhanced
corrections (both from scalar and tensor long-wavelength modes) are easily
recovered from our IR-safe correlation functions. Among other examples, we
illustrate this by calculating the corrections to the non-Gaussianity parameter
f_NL coming from long-wavelength tensor modes. In our approach, the IR
corrections automatically emerge in a resummed, all-orders form. For the scalar
corrections, the resulting all-orders expression can be evaluated explicitly.
