Christian Corda 100 years of gravitational waves: the event GW150914 and the future of gravitational theories (284K, PDF) ABSTRACT. Did the event GW150914 ultimately confirm the general theory of relativity (GTR)? Here we show that the correct answer is not yet and we discuss the future of gravitational theories in the framework of gravitational wave (GW) astronomy. In particular, we show that f(R) theories of gravity are ruled out with a confidence level higher than 90% .