Browsing by Author "Ghasemkhani, M."

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    Impossibility of obtaining a CP-violating Euler–Heisenberg effective theory from a viable modification of QED
    (2022) Ghasemkhani, M.; Rahmanpour, V.; Bufalo, R.; Soto Villarroel, Alex
    In this paper, we examine the CP-violating term of the Euler–Heisenberg action. We focus in the aspects related with the generation of such a term from a QED-like model in terms of the effective action approach. In particular, we show that the generation of the CP-violating term is closely related with both of vector and axial fermionic bilinears. Although, these anomalous models are not a viable extension of QED, we argue that the CP-violating term in the photon sector is obtained only from this class of models, and not from any fundamental field theory.
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    Induced Maxwell-Chern-Simons effective action in very special relativity
    (2020) Bufalo, R.; Ghasemkhani, M.; Haghgouyan, Z.; Soto, A.
    In this paper, we study the one-loop induced photon's effective action in the very special relativity electrodynamics in (2+1) spacetime (VSR-QED3). Due to the presence of new nonlocal couplings resulting from the VSR gauge symmetry, we have additional graphs contributing to the AA and AAA amplitudes. From these contributions, we discuss the VSR generalization of the Abelian Maxwell-Chern-Simons Lagrangian, consisting in the dynamical part and the Chern-Simons-like self-couplings, respectively. We use the VSR-Chern-Simons electrodynamics to discuss some non-Ohmic behavior on topological materials, in particular VSR effects on Hall's conductivity. In the dynamical part of the effective action, we observe the presence of a UV/IR mixing, due to the entanglement of the VSR nonlocal effects to the quantum higher-derivative terms. Furthermore, in the self-coupling aspect, we verify the validity of the Furry's theorem in the VSR-QED3 explicitly.