نوع فایل :PDF تعداد صفحات :10 سال انتشار :1394 چکیده In this paper gravitational waves in high-frequency limits were briefly reviewed. A general formalism was derived for approximating gravitational wave solutions to the vacuum Einstein equations of general relativity in situations where the gravitational fields are quite strong. To accomplish this by assuming that the wave has a high-frequency limit and expands the vacuum field equations in powers of the ...