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Flavor mixing of quantum fields was found to be responsible for the breakdownof the thermal Unruh effect. Recently, this result was revisited in the contextof nonextensive Tsallis thermostatistics, showing that the emergent vacuumcondensate can still be featured as a thermal-like bath, provided that theunderlying statistics is assumed to obey Tsallis prescription. This wasanalyzed explicitly for bosons. Here we extend this study to Dirac fermions andin particular to neutrinos. Working in the relativistic approximation, weprovide an effective description of the modified Unruh spectrum in terms of theq-generalized Tsallis statistics, the q-entropic index being dependent on themixing parameters sin {\theta} and \Delta m. As opposed to bosons, we find q >1, which is indicative of the subadditivity regime of Tsallis entropy. Anintuitive understanding of this result is discussed in relation to thenontrivial entangled structure exhibited by the quantum vacuum for mixedfields, combined with the Pauli exclusion principle.

Nonextensive Tsallis statistics in Unruh effect for Dirac neutrinos