Assisted neutrino pair production in combined external fields

Neutrino--antineutrino ($\nu\bar\nu$) pair production is one of the main processes responsible for the energy loss of stars. Apart from the collision of two ($\gamma\gamma\to\nu\bar\nu$) or three ($\gamma\gamma\gamma\to\nu\bar\nu$) real photons, photon decay and photon collisions in the presence of nuclear Coulomb fields or external magnetic fields have been considered previously. Here, we study the low-energy photon decay into a pair of neutrino and antineutrino in the presence of a combined homogeneous magnetic field and the Coulomb field of a nucleus with charge number $Z$.

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