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If ALPs exist, the refractive index of light will be modified when lighttraverses a region where an ALP field is present. We propose to measure therefractive index of light and its angular dependence as the Earth rotates withrespect to the direction of the ALP wind. The LIGO Interferometers aresensitive to differences in the refractive index of the light circulating inthe two arms, and such differences were recorded during the S5 run, February2006 to July 2007. They are due in part to the horizontal tidal gradients whenthey are aligned with one of the arms. In addition a very strong modulation wasobserved at twice the Earth's orbital frequency as can be seen in Fig.1. Thiscan be understood if the difference in the refractive index between the twoarms depends on the angle between the light propagation vector and thedirection of the ALP wind. We present the data as a function of the Earth'smotion, and discuss the magnitude of the observed refractive index, n-1 ~10e-20.

Proposed Search for a wind of Axion-like-particles using the Gravitational Wave Interferometers