Adiabatic regularization for spin-1/2 fields
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Adiabatic regularization for spin-1/2 fields

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Adiabatic regularization for spin-1/2 fields

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Landete Marcos, Aitor; Navarro Salas, José Perfil; Torrentí Salom, Francisco
This document is a artículoDate2013

Este documento está disponible también en : http://dx.doi.org/10.1103/PhysRevD.88.061501

Este documento está disponible también en : http://hdl.handle.net/10550/33121
We 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.

    Landete Marcos, Aitor Navarro Salas, José Torrenti Salom, Francisco 2013 Adiabatic regularization for spin-1/2 fields Physical Review D 88 6 061501(R)
http://dx.doi.org/10.1103/PhysRevD.88.061501

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