arXiv:1108.0079 [pdf, ps, other] Gravitational wave generation in loop quantum cosmology Paulo M. Sá, Alfredo B. Henriques Comments: 7 pages, 8 figures, revtex4 Subjects: General Relativity and Quantum Cosmology (gr-qc) We calculate the full spectrum, as observed today, of the cosmological gravitational waves generated within a model based on loop quantum cosmology. It is assumed that the universe, after the transition to the classical regime, undergoes a period of inflation driven by a scalar field with a chaotic-type potential. Our analysis shows that, for certain conditions, loop quantum effects leave a clear signature on the spectrum, namely, an over-production of low-frequency gravitational waves. One of the aims of our work is to show that loop quantum cosmology models can be tested and that, more generally, pre-inflationary physical processes, contrary to what is usually assumed, leave their imprint in those spectra and can also be tested. All we have to do now is get a gravity wave detector that works.