Determining the Gravitational Waves by using Spectrum Analysis

Abstract

The presence of gravitational waves (GW) has been a matter of argument for decades, ever since their presence was predicted by Einstein’s general relativity theory (GR). And because every object in the path of such a wave feels a tidal gravitational force that acts perpendicular to the wave direction of propagation, that is why their presence were investigated in terms of the presence of a very tiny strain occur in objects in their path and that is via a some certain laser interferometer devices setup, e.g. in the USA an outstanding method of detecting these waves have been established, i.e. the Laser Interferometer Gravitational Waves Observatory (LIGO). In our dissertation we’ve collected strain data of the observation setup of gravitational waves events from the LIGO webpage and we reproduced interpretation of the presence of gravitational waves and that is via obtaining the dynamic spectrum plots for these GW events using time series data of the strain (ℎ) where we obtained power spectrum in the frequency- time domain through discrete Fourier time series (D- FFT) on the data. We have viewed GW in our plots where peak amplitude occur at the time: 16.53 second. Therefore, detection of GW is expected to open up a new window for observational astronomy since information carried by GW are very different from those information carried by electromagnetic waves.