Abstract
Emission of gravitational waves (GW) in the early universe by light primordial black holes(PBH) is considered. It is supposed that PBHs dominated in the cosmological energy density at some early stage of the cosmological history. At this stage previously existed relics (including GWs from ination) could be diluted and the new radiation dominated era emerged after the PBH evaporation. GWs produced by the PBH interactions and evaporation would have very high energy, 1-100 keV, which is far outside the sensitivity range of the traditional GW detectors.. A possibility of observation of such energetic GWs through graviton-to-photon transition in external magnetic eld is discussed.
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