Baryon Acoustic Peak and the Squeezed Limit Bispectrum
  In the non-relativistic regime, pertinent to the large scale structure of the
Universe, the leading effect of a long-wavelength perturbation
$\delta(\lambda_L)$ on short distance physics is a uniform acceleration
$\propto \lambda_L \delta(\lambda_L)$. Typically, this has no effect on
statistical averages at equal time since a uniform acceleration results in a
uniform translation -- a reasoning that has been formalized as a "consistency
condition" on the cosmological correlation functions. This naive expectation
fails in the presence of the baryon acoustic feature provided $\lambda_L <
\ell_{\rm BAO}$. We derive the squeezed limit of correlation functions in this
regime.
