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Various processes that are forbidden in the vacuum due to angular momentumconservation can occur in a medium that is isotropic and does not carry anyangular momentum. We illustrate this by considering explicitly two examples.The first one is the decay of a spin-0 particle into a photon and anotherspin-0 particle, using a model involving the Yukawa interactions of the scalarparticles with a charged fermion field. The second one involves the decay of aneutrino into another neutrino and a graviton, in the standard model ofparticle interactions augmented with the linearized gravitational couplings.

Angular momentum non-conserving decays in isotropic media