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Adiabatic regularization for spin-1/2 fields

AutorLandete Marcos, Aitor; Navarro-Salas, José ; Torrentí Salom, Francisco
Palabras claveEnergy-momentum tensor
Particle creation
Fecha de publicación3-sep-2013
EditorAmerican Physical Society
CitaciónPhysical Review - Section D - Particles and Fields 88 (6): 061501 - 5 (2013)
ResumenWe extend the adiabatic regularization method to spin-1/2 fields. The ansatz for the adiabatic expansion for fermionic modes differs significantly from the WKB-type template that works for scalar modes. We give explicit expressions for the first adiabatic orders and analyze particle creation in de Sitter spacetime. As for scalar fields, the adiabatic method can be distinguished by its capability to overcome the UV divergences of the particle number operator. We also test the consistency of the extended method by working out the conformal and axial anomalies for a Dirac field in a Friedmann-Lemaitre-Robertson-Walker spacetime, in exact agreement with those obtained from other renormalization prescriptions. We finally show its power by computing the renormalized stress-energy tensor for Dirac fermions in de Sitter space.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.88.061501
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