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5 papers · 2 filters
Generalized generating functional for mixed-representation Green's functions: A quantum mechanical approach
Massimo Blasone, Petr Jizba, Luca Smaldone
When one tries to take into account the non-trivial vacuum structure of Quantum Field Theory, the standard functional-integral tools such as generating functionals or transitional…
Towards Complexity for Quantum Field Theory States
Shira Chapman, Michal P. Heller, Hugo Marrochio +1
We investigate notions of complexity of states in continuous quantum-many body systems. We focus on Gaussian states which include ground states of free quantum field theories and t…
Holographic Entanglement Entropy of Local Quenches in AdS/CFT: A Finite-Element Approach
Alexander Jahn, Tadashi Takayanagi
Understanding quantum entanglement in interacting higher-dimensional conformal field theories is a challenging task, as direct analytical calculations are often impossible to perfo…
Relations between positivity, localization and degrees of freedom: the Weinberg-Witten theorem and the van Dam-Veltman-Zakharov discontinuity
Jens Mund, Karl-Henning Rehren, Bert Schroer
The problem of accounting for the quantum degrees of freedom in passing from massive higher-spin potentials to massless ones and its inverse, the "fattening" of massless tensor pot…
Helicity decoupling in the massless limit of massive tensor fields
Jens Mund, Karl-Henning Rehren, Bert Schroer
Massive and massless potentials play an essential role in the perturbative formulation of particle interactions. Many difficulties arise due to the indefinite metric in gauge theor…