Sá, PauloHenriques, Alfredo B.Aldaya, VBarcelo, CJaramillo, JL2018-12-072018-12-0720111742-6588http://hdl.handle.net/10400.1/12071The generation of primordial gravitational waves is investigated within the hybrid quintessential inflationary model. Using the method of continuous Bogoliubov coefficients, we calculate the full gravitational-wave energy spectrum. The post-inflationary kination period, characteristic of quintessential inflationary models, leaves a clear signature on the spectrum, namely, a sharp rise of the gravitational-wave spectral energy density Omega(GW) at high frequencies. For appropriate values of the parameters of the model, Omega(GW) can be as high as 10(-12) in the MHz-GHz range of frequencies.engGraviton creationEnergy densityUniverseRadiationDetectorconference object10.1088/1742-6596/314/1/012062