Baryon Acoustic Oscillations (BAO) have recently been observed in the
distribution of distant galaxies. The height and location of the BAO peak
are strong discriminators of cosmological parameters. Here we consider the
ways in which weak gravitational lensing distorts the BAO signal. We find
two effects that can affect the height of the BAO peak in the correlation
function at the percent level but that do not significantly impact the
position of the peak and the measurement of the sound horizon. BAO turn out
to be robust cosmological standard rulers.
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