Results 31 to 40 of about 13,323,592 (307)
Quantum gravity in three dimensions, Witten spinors and the quantisation of length
Nuclear Physics B, 2018 In this paper, I investigate the quantisation of length in euclidean quantum gravity in three dimensions. The starting point is the classical hamiltonian formalism in a cylinder of finite radius. At this finite boundary, a counter term is introduced that
Wolfgang Wieland
doaj +1 more source
A Lorentzian inversion formula for defect CFT
Journal of High Energy Physics, 2020 We present a Lorentzian inversion formula valid for any defect CFT that extracts the bulk channel CFT data as an analytic function of the spin variable.
Pedro Liendo +2 more
doaj +1 more source
Topics in quantum gravity and quantum field theory [PDF]
, 2022 In this thesis, we analyse three different quantum systems via operator and path integral techniques: 'two-dimensional Causal-Dynamical-Triangulations (CDT) coupled to hard-dimers', 'scalar solitons' and `Quantum Random Walks (QRW) on the Cayley tree ...
Xavier, Praveen
core +1 more source
Quantum field theories with boundaries and novel instabilities [PDF]
Physical Review D, 2014 Quantum physics on manifolds with boundary brings novel aspects due to boundary conditions. One important feature is the appearance of localised negative eigenmodes for the Laplacian on the boundary. These can potentially lead to instabilities. We consider quantum field theories on such manifolds and interpret these as leading to the onset of phase ...
Govindarajan, T. R., Nair, V. P.
openaire +2 more sources
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
On the Non-local Boundary Condition in Quantum Field Theory [PDF]
Progress of Theoretical Physics, 1960 The non-local boundary condition introduced by Bogolyubov et al. is useful for eliminating the difficulty of negative probability concerning the indefinite metric in Hilbert space. Their theory is developed in the S-matrix formalism and does not give a causal description of the physical state.
openaire +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 ...
Dudal, David, Pais, Pablo, Rosa, Luigi
openaire +4 more sources
Advances in Quantum Field Theory [PDF]
, 2012 Quantum Field Theory is now well recognized as a powerful tool not only in Particle Physics but also in Nuclear Physics, Condensed Matter Physics, Solid State Physics and even in Mathematics. In this book some current applications of Quantum Field Theory
core +1 more source
The Quantum Field Theory Boundaries Applicability and Black Holes Thermodynamics [PDF]
International Journal of Theoretical Physics, 2021 21 pages ...
openaire +4 more sources
Topological Quantum Field Theory and the Geometric Langlands Correspondence [PDF]
, 2013 In the pioneering work of A. Kapustin and E. Witten, the geometric Langlands program of number theory was shown to be intimately related to duality of GL-twisted N=4 super Yang-Mills theory compactified on a Riemann surface. In this thesis, we generalize
Setter, Kevin Luke
core +1 more source