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The origin of magnetic fields in astrophysical objects is a challengingproblem in astrophysics. Throughout the years, many scientists have suggestedthat non-minimal gravitational-electromagnetic coupling (NMGEC) could be theorigin of the ubiquitous astrophysical magnetic fields. We investigate thepossible origin of intense magnetic fields $\sim 10^{15}-10^{16}$ by NMGEC nearrotating neutron stars and black holes, connected with magnetars, quasars, andgamma-ray bursts. Whereas these intense magnetic fields are difficult toexplain astrophysically, we find that they are easily explained by NMGEC.

Origin of Intense Magnetic Fields Near Black Holes Due to Non-Minimal Gravitational-Electromagnetic Coupling