Weak vs. strong breaking of integrability in interacting scalar quantum field theories by Bence Fitos, Gábor Takács

“…We find that a naive extension of the scaling of crossover coupling with the volume observed in spin chains does not give satisfactory results for quantum field theory. Instead, we demonstrate that considering the scaling of the crossover coupling with the number of particles yields robust signatures, and is able to distinguish between the strengths of integrability breaking in the $\phi^4$ and $\phi^6$ quantum field theories.…”
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Hydrodynamic Quantum Field Theory: The Onset of Particle Motion and the Form of the Pilot Wave by Durey, Matthew, Bush, John W. M.

“…We consider the hydrodynamic quantum field theory proposed by Dagan and Bush, a model of quantum dynamics inspired by Louis de Broglie and informed by the hydrodynamic pilot-wave system discovered by Couder and Fort. …”
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PRESERVING UNITARITY IN A NOVEL PERTURBATIVE TECHNIQUE FOR SOLVING QUANTUM-FIELD THEORY by Monoyios, M

Preserving unitarity in a novel perturbative technique for solving quantum field theory by Monoyios, M

Viscosity in strongly interacting quantum field theories from black hole physics. by Kovtun, P, Son, D, Starinets, A

“…Using string theory methods, we show that this ratio is equal to a universal value of variant Planck's over 2pi/4pik(B) for a large class of strongly interacting quantum field theories whose dual description involves black holes in anti-de Sitter space. …”

Holographic Projection of Electromagnetic Maxwell Theory by Erica Bertolini, Nicola Maggiore

Subjects: “…quantum field theory…”
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Superluminal Local Operations in Quantum Field Theory: A Ping-Pong Ball Test by Albert Much, Rainer Verch

Subjects: “…quantum field theory…”
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Renormalization scheme dependence of $$\beta $$ β -functions in Lorentz-violating quantum field theory by Sapan Karki, Brett Altschul

“…Abstract Effective quantum field theories that allow for the possibility of Lorentz symmetry violation can sometimes also include redundancies of description in their Lagrangians. …”
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Spin supplementary condition in quantum field theory: covariant SSC and physical state projection by Jung-Wook Kim, Jan Steinhoff

“…It is argued that the equivalent constraints in quantum field theory are the projection conditions on polarisation tensors, which remove timelike/longitudinal polarisations from the physical spectrum. …”
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Purely virtual extension of quantum field theory for gauge invariant fields: quantum gravity by Damiano Anselmi

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Achieving the quantum field theory limit in far-from-equilibrium quantum link models by Jad C. Halimeh, Maarten Van Damme, Torsten V. Zache, Debasish Banerjee, Philipp Hauke

“…In light of the impressive ongoing efforts to achieve such realizations, a fundamental question regarding quantum link model regularizations of lattice gauge theories is how faithfully they capture the quantum field theory limit of gauge theories. Recent work \cite{zache2021achieving} has shown through analytic derivations, exact diagonalization, and infinite matrix product state calculations that the low-energy physics of $1+1$D $\mathrm{U}(1)$ quantum link models approaches the quantum field theory limit already at small link spin length $S$. …”
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Determining all thermodynamic transport coefficients for an interacting large N quantum field theory by Max Weiner, Paul Romatschke

“…Abstract Thermodynamic transport coefficients can be calculated directly from quantum field theory without requiring analytic continuation to real time. …”
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Initial states in integrable quantum field theory quenches from an integral equation hierarchy by D.X. Horváth, S. Sotiriadis, G. Takács

“…We consider the problem of determining the initial state of integrable quantum field theory quenches in terms of the post-quench eigenstates. …”
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The eikonal approximation in quantum field theory: applications to the vertex function and light cone physics. by Eichten, Estia Joseph.

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THE PRINCIPLE OF MINIMAL SENSITIVITY APPLIED TO A NEW PERTURBATIVE SCHEME IN QUANTUM-FIELD THEORY by Jones, H, Monoyios, M

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts by Ellis, R, Kunszt, Z, Melnikov, K, Zanderighi, G

One-loop calculations in quantum field theory: From Feynman diagrams to unitarity cuts by Ellis, R, Kunszt, Z, Melnikov, K, Zanderighi, G

“…Recently, new approaches based on unitarity have been developed for calculating one-loop scattering amplitudes in quantum field theory. These methods are especially suitable for the description of multi-particle processes in QCD and are amenable to numerical implementations. …”

Taking particle physics seriously: A critique of the algebraic approach to quantum field theory by Wallace, D

“…I argue against the currently prevalent view that algebraic quantum field theory (AQFT) is the correct framework for philosophy of quantum field theory and that "conventional" quantum field theory (CQFT), of the sort used in mainstream particle physics, is not suitable for foundational study. …”

Relativistic quantum fields/ by 272315 Bjorken, James D., Drell, Sidney D.

Subjects: “…Quantum field theory…”

Relativistic quantum fields/ by 354675 Nash, Charles

Subjects: “…Quantum field theory…”