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5 papers · 2 filters
-summed form of the QED effective action
Jose Navarro-Salas, Silvia Pla
We conjecture that the proper-time series expansion of the one-loop effective Lagrangian of quantum electrodynamics can be summed in all terms containing the field-strength invaria…
Radiative corrections in metric-affine bumblebee model
Adrià Delhom, J. R. Nascimento, Gonzalo J. Olmo +2
We consider the metric-affine formulation of bumblebee gravity, derive the field equations, and show that the connection can be written as Levi-Civita of a disformally related metr…
Multicenter solutions in Eddington-inspired Born-Infeld gravity
Gonzalo J. Olmo, Emanuele Orazi, Diego Rubiera-Garcia
We find multicenter (Majumdar-Papapetrou type) solutions of Eddington-inspired Born-Infeld gravity coupled to electromagnetic fields governed by a Born-Infeld-like Lagrangian. We c…
Hairy Black-holes in Shift-symmetric Theories
Paolo Creminelli, Nicolás Loayza, Francesco Serra +2
Scalar hair of black holes in theories with a shift symmetry are constrained by the no-hair theorem of Hui and Nicolis, assuming spherical symmetry, time-independence of the scalar…
Adiabatic regularization for Dirac fields in time-varying electric backgrounds
Pau Beltrán-Palau, Jose Navarro-Salas, Silvia Pla
The adiabatic regularization method was originally proposed by Parker and Fulling to renormalize the energy-momentum tensor of scalar fields in expanding universes. It can be exten…