The influence of quarks and gluons jets coming from primordial black   holes on the reionization of the Universe
  The quantum evaporation of primordial black holes may have a relevant effect on the reionization of the Universe at small redshifts ($z \leq 60$): in this paper, I studied the possibility of a reionization induced by the photons emitted during the last stages of the black holes life. I also took into account the quark and gluons jets production, that sensibly modifies the blackbody Hawking emission spectrum. In this way, one obtains a ``late and sudden'' reionization process, characterised by a very well controlled rise of the plasma temperature: the plasma heating is not so high to induce a strong distortion of the CBR spectrum, in agreement with the recent FIRAS upper limit on the comptonization parameter. 
Marina Gibilisco (Queen Mary and Westfield College, London,   Universit\'a degli Studi di Milano and Universit\'a degli Stud...