5 Besides its own significance, gravitational wave obser- vation is very important since it will open new windows in our understanding of the universe. One can test whole class of alternate theories of gravity which would results into peculiar imprints such as additional polarization states. Higher order theories of gravity, Brans-Dicke the- ory, massive graviton theories and Chern-Simons modi- fied gravity are just some of the alternate theories of grav- ity that we can test (see [58, 59] and references therein). This work should serve as a guide for gravita- tional wave observers who would like to search for im- prints of modified gravity models without dark matter. LIGO/VIRGO are currently doing joint science opera- tions at design sensitivities and searches for gravitational waves with electromagnetic counterparts is a key project [60]. And this test is just another motivation to look for it. I am grateful to Richard Woodard and Shantanu Desai for stimulating discussions. 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