We investigate the generation of gravitational waves in power-law
inflationary models. The energy spectrum of the gravitational waves is
calculated using the method of continuous Bogoliubov coefficients. We show
that, by looking at the interval of frequencies between 10^(-5) and 10^5 Hz and
also at the GHz range, important information can be obtained, both about the
inflationary period itself and about the thermalization regime between the end
of inflation and the beginning of the radiation-dominated era. We thus deem the
development of gravitational wave detectors, covering the MHz/GHz range of
frequencies, to be an important task for the future.Comment: 8 pages, 6 figures, added 3 references, text improve