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Diphoton decay of the higgs from the Epstein–Glaser viewpoint
We revisit a nearly 10-year old controversy on the diphoton decay of the Higgs particle. To a large extent, the controversy turned around the...
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Bogoliubov’s causal perturbative QED and white noise. Interacting fields
AbstractWe present Bogoliubov’s causal perturbative QFT with a single refinement: the creation–annihilation operators at a point, i.e., for a...
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A Comment on the Classical Electron Self-Energy
This paper is devoted to the analysis of the divergence of the electron self-energy in classical electrodynamics. To do so, we appeal to the theory...
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Causal perturbative QED and white noise
AbstractWe present Bogoliubov’s causal perturbative QFT with only one refinement: the creation–annihilation operators at a point, i.e., for a...
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Perturbative expansions and the foundations of quantum field theory
Perturbative expansions have played a peculiarly central role in quantum field theory, not only in extracting empirical predictions but also in...
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Local and Covariant Flow Relations for OPE Coefficients in Lorentzian Spacetimes
For Euclidean quantum field theories, Holland and Hollands have shown operator product expansion (OPE) coefficients satisfy “flow equations”: For...
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Regularizing (Away) Vacuum Energy
In this paper I formulate Minimal Requirements for Candidate Predictions in quantum field theories, inspired by viewing the standard model as an...
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Renormalization in String-Localized Field Theories: A Microlocal Analysis
Using methods of microlocal analysis, we prove that the regularization of divergent amplitudes stays a pure ultraviolet problem in string-localized...
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Crossing beyond scattering amplitudes
We find that different asymptotic measurements in quantum field theory can be related to one another through new versions of crossing symmetry ....
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Null-plane causal perturbation theory
We reconstruct causal perturbation theory in a way compatible with light-front dynamics on the basis of Rohrlich’s invariant null-plane...
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The Master Ward Identity for Scalar QED
It is emphasized that for interactions with derivative couplings, the Ward Identity (WI) securing the preservation of a global symmetry should be...
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Quantum Parity Conservation in Planar Quantum Electrodynamics
Quantum parity conservation is verified at all orders in perturbation theory for a massless parity-even U (1) × U (1) planar quantum electrodynamics...
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What can be measured asymptotically?
We consider asymptotic observables in quantum field theories in which the S-matrix makes sense. We argue that in addition to scattering amplitudes, a...
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On the S-matrix of Ising field theory in two dimensions
We explore the analytic structure of the non-perturbative S-matrix in arguably the simplest family of massive non-integrable quantum field theories:...
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Causal Stepanov–Bogoliubov’s interacting fields for Yukawa’s model
We explore the properties of Stepanov–Bogoliubov’s interacting fields in the perturbative regime in the axiomatic framework of causal perturbation...
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Unitary, Anomalous Master Ward Identity and its Connections to the Wess–Zumino Condition, BV Formalism and \(L_\infty \)-algebras
The C*-algebraic construction of QFT by Buchholz and one of us relies on the causal structure of space-time and a classical Lagrangian. In one of our...
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Null energy constraints on two-dimensional RG flows
We study applications of spectral positivity and the averaged null energy condition (ANEC) to renormalization group (RG) flows in two-dimensional...
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Factorization formulas for tree amplitudes
We present a coordinate space version of the factorization formula for the connected tree part of the chronological products. We consider a general...
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Pions: the original Nambu–Goldstone bosons
In this special issue being brought in the centenary year of the birth of Yoichiro Nambu, we exemplify on his discovery of spontaneous symmetry...
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Weak Adiabatic Limit in Quantum Field Theories with Massless Particles
We construct the Wightman and Green functions in a large class of models of perturbative QFT in the four-dimensional Minkowski space in the...