López Maroto, AntonioMazumdar, Anupam2023-06-202023-06-201999-03-24[1] L. Kofman, A.D. Linde, and A.A. Starobinsky, Phys. Rev. Lett. 73, 3195 (1994); L. Kofman, A.D. Linde, and A.A. Starobinsky, Phys. Rev. D 56, 3258 (1997). [2] R. Easther and K. Maeda, gr-qc/9711035, 1997. [3] L.P. Grishchuk, Sov. Phys. JETP 40, 409 (1975); Ann. (N.Y.) Acad. Sci. 302, 439 (1977). [4] M. Gasperini, M. Giovannini, and G. Veneziano, Phys. Rev. Lett. 75, 3796 (1995). [5] M. Gasperini and M. Giovannini, Phys. Rev. D 47, 1519 (1993). [6] J. Garriga and E. Verdaguer, Phys. Rev. D 39, 1072 (1989). [7] M.B. Green, J.H. Schwarz, and E. Witten, Superstring Theory (Cambridge University Press, Cambridge, England, 1987). [8] R.R. Metsaev and A.A. Tseytlin, Nucl. Phys. B293, 92 (1987). [9] E.J. Copeland, A. Lahiri, and D. Wands, Phys. Rev. D 51, 1569 (1995); 50, 4868 (1994). [10] A.L. Maroto and I.L. Shapiro, Phys. Lett. B 414, 34 (1997). [11] P. van Nieuwenhuizen, Phys. Rep. 68, 4 (1981). [12] F.W. Hehl, P. Heyde, G.D. Kerlick, and J.M. Nester, Rev. Mod. Phys. 48, 393 (1976). [13] A. Dobado and A.L. Maroto, Phys. Rev. D 54, 5185 (1996). [14] P.B. Greene and L. Kofman, hep-ph/9807339. [15] J. Baacke, K. Heitmann, and C. Patzold, Phys. Rev. D 58, 1 25 013 (1998). [16] A.S. Belyaev and I.L Shapiro, Phys. Lett. B 425, 246 (1998). [17] A. Dobado and A.L. Maroto, hep-th/9712198. [18] A.L. Maroto, Phys. Rev. D 59, 063501 (1999). [19] N.D. Birrell and P.C.W. Davies, Quantum Fields in Curved Space (Cambridge University Press, Cambridge, England, 1982). [20] V.M. Mostepanenko and V.M. Frolov, Sov. J. Nucl. Phys. 19, 451 (1974). [21] A.A. Grib, S.G. Mamayev, and V.M. Mostepanenko, Vacuum Quantum Effects in Strong Fields (Friedmann Laboratory Publishing, St. Petersburg, 1994). [22] A.A. Andrianov and R. Soldati, Phys. Lett. B 435, 449 (1998); A.A. Andrianov, R. Soldati, and L. Sorbo, Phys. Rev. D 59, 025002 (1999).0556-282110.1103/PhysRevD.59.083510https://hdl.handle.net/20.500.14352/59335© 1999 The American Physical Society. A.L.M. acknowledges support from SEUID-Royal Society and (CICYT-AEN96-1634) (Spain). A.M. is supported by INLAKS and ORS. We thank Juan García Bellido, Luis Mendes, and Andrew Liddle for valuable discussions.We consider the resonant production of fermions from an oscillating axial background. The classical evolution of the axial field is given by that of a massive pseudovector field, as suggested by the renormalizability of the theory. We look upon both the massive and the massless fermion production from a perturbative point of view. We obtain the corresponding spectrum and angular distributions for the different spins or helicities in the particular case of a spatial-like axial held. We also extend our study to the nonperturbative regime in the massless case and compare the results with the perturbative ones. [S0556-2821(99)04308-8].engjournal articlehttp://dx.doi.org/10.1103/PhysRevD.59.083510http://journals.aps.org/open access53String cosmologyTorsionTimeInflationFieldFísica (Física)22 Física