Effective lagrangian for a mass dimension one fermionic field in curved spacetime

In this work we use momentum-space techniques to evaluate the propagator G(xx') for a spin 1/2 mass dimension one spinor field on a curved Friedmann-Robertson-Walker spacetime. As a consequence, we built the one-loop correction to the effective lagrangian in the coincidence limit. Going further we compute the effective lagrangian in the finite temperature regime. We arrive at interesting cosmological consequences, as time-dependent cosmological 'constant', fully explaining the functional form of previous cosmological models.CAPESCNPq - Conselho Nacional de Desenvolvimento Cientificoe Tecnologico, Brazilian research agencyCNPqUniv Estadual Paulista, UNESP, Fac Engn, Dept Fis & Quim, BR-12516410 Guaratingueta, SP, BrazilUniv Fed Sao Paulo, UNIFESP, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, BrazilUniv Fed Sao Paulo, UNIFESP, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, BrazilCNPq: 304297/2015-1, 400924/2016-1CNPq: 304629/2015-4, 445385/2014-6Web of Scienc