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787 papers · 1 filter
Quantum gravity and matter fields in a general background gauge
J. Frenkel, S. Martins-Filho
We analyse the gauge-dependence of the effective action in an interacting quantum theory of gravitational and matter fields. An explicit off-shell result is obtained in a general b…
Celestial Regge theory
Eduardo Casali, Riccardo Giordana Pozzi
Exploiting the analytic properties of scattering amplitudes, we provide an alternative but equivalent definition of the standard Mellin transform used to obtain celestial correlati…
On the physical running of the electric charge in a dimensionless theory of gravity
M. Gomes, A. C. Lehum, A. J. da Silva
We revisit the renormalization of the gauge coupling in massless QED coupled to a scaleless quadratic theory of gravity. We compare two alternative prescriptions for the running of…
Classical scattering matrix for hard and soft Bose-excitations in a non-Abelian plasma within the Hamiltonian formalism
Yu. A. Markov, M. A. Markova, D. M. Gitman +1
Within the framework of the Zakharov-Schulman approach, in close analogy with the methods of quantum field theory, the classical scattering matrix for the simplest process of inter…
Equivalence of first and second order formulations of the Einstein-Hilbert theory
F. T. Brandt, J. Frenkel, S. Martins-Filho +1
We derive a general relation between the background effective actions, which directly proves that the two formulations of the Einstein-Hilbert theory with background fields are equ…
Universal sectors in superconformal defects
Riccardo Giordana Pozzi
We study universal features of defect correlation functions in supersymmetric defect CFTs, focusing on four-point functions of the displacement supermultiplet. By perturbing the le…