Tamburini, FabrizioFabrizioTamburiniDe Laurentis, MariafeliciaMariafeliciaDe LaurentisAMATI, LORENZOLORENZOAMATIThidé, BoBoThidé2020-09-072020-09-0720172470-0010http://hdl.handle.net/20.500.12386/27173We propose a new energy extraction mechanism from the rotational energy of a Kerr-Newman black hole by a gravitating massive photon field generated by electromagnetic and gravitational field coupling effects. Numerical studies show that this mechanism that depends on the black hole rotation parameter, a , shows a clear dependence on the black hole mass, M , and charge, Q , and can extract energies up to 1 0<SUP>54</SUP> erg for a black hole of the solar mass size. With this mechanism we can set a lower bound on the coupling ξ ∼10<SUP>-38</SUP> between electromagnetic and gravitational fields that might be used to explain the hypothetical extremely high energy release, >10<SUP>53</SUP> erg, suggested by the observations of some gamma-ray bursts in the controversial "energy crisis" problem if and when gamma-ray bursts seem not to show evidence for collimated emission.STAMPAenArticle10.1103/PhysRevD.96.1040032-s2.0-85037134827000414421400005https://journals.aps.org/prd/abstract/10.1103/PhysRevD.96.1040032017PhRvD..96j4003TFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering