Results 61 to 70 of about 1,558,839 (324)
Overlap singularity and time evolution in integrable quantum field theory
Journal of High Energy Physics, 2018 We study homogeneous quenches in integrable quantum field theory where the initial state contains zero-momentum particles. We demonstrate that the two-particle pair amplitude necessarily has a singularity at the two-particle threshold.
D. X. Horváth, M. Kormos, G. Takács
doaj +1 more source
Quantum Field Theory from First Principles [PDF]
, 2000 When quantum fields are studied on manifolds with boundary, the corresponding one-loop quantum theory for bosonic gauge fields with linear covariant gauges needs the assignment of suitable boundary conditions for elliptic differential operators of ...
Esposito, Giampiero
core +3 more sources
Scalar Field with Robin Boundary Conditions in the Worldline Formalism [PDF]
, 2007 The worldline formalism has been widely used to compute physical quantities in quantum field theory. However, applications of this formalism to quantum fields in the presence of boundaries have been studied only recently.
Bastianelli, Fiorenzo +2 more
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BRST Invariant Boundary Conditions for Gauge Theories [PDF]
Phys.Rev. D55 (1997) 1072-1078, 1996 A systematic way of generating sets of local boundary conditions on the gauge fields in a path integral is presented. These boundary conditions are suitable for one--loop effective action calculations on manifolds with boundary and for quantum cosmology.
arxiv +1 more source
Casimir energy in terms of boundary quantum field theory: The QED case [PDF]
Physical Review D, 2020 We revisit the path integral computation of the Casimir energy between two infinite parallel plates placed in a QED vacuum. We implement perfectly magnetic conductor boundary conditions (as a prelude to the dual superconductor picture of the QCD vacuum) via constraint fields and show how an effective gauge theory can be constructed for the constraint ...
Pablo Pais +4 more
openaire +6 more sources
Rényi entanglement entropies for the compactified massless boson with open boundary conditions
Journal of High Energy Physics, 2019 We investigate the Rényi entanglement entropies for the one-dimensional massless free boson compactified on a circle, which describes the low energy sector of several interacting many-body 1d systems (Luttinger Liquid).
Alvise Bastianello
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Quantum Entanglement on Boundaries [PDF]
, 2013 Quantum entanglement in 3 spatial dimensions is studied in systems with physical boundaries when an entangling surface intersects the boundary. We show that there are universal logarithmic boundary terms in the entanglement R\'{e}nyi entropy and derive them for different conformal field theories and geometrical configurations.
arxiv +1 more source
Composite operators near the boundary
Journal of High Energy Physics, 2020 We use renormalization group methods to study composite operators existing at a boundary of an interacting conformal field theory. In particular we relate the data on boundary operators to short-distance (near-boundary) divergences of bulk two-point ...
Vladimír Procházka +1 more
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Defect extremal surface as the holographic counterpart of Island formula
Journal of High Energy Physics, 2021 We propose defect extremal surface as the holographic counterpart of boundary quantum extremal surface. The defect extremal surface is defined by minimizing the Ryu-Takayanagi surface corrected by the defect theory.
Feiyu Deng, Jinwei Chu, Yang Zhou
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On the quantum reflection factor for the sinh-Gordon model with general boundary conditions [PDF]
, 2000 The one loop quantum corrections to the classical reflection factor of the sinh-Gordon model are calculated partially for general boundary conditions.
Chenaghlou A., Corrigan E.
core +2 more sources