Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Capatti, Zeno"'
A framework for computing the superfluid gap in an effective field theory (EFT) of fermions interacting via momentum-independent contact forces is developed. The leading universal corrections in the EFT are one-loop in-medium effects at the Fermi sur
Externí odkaz:
http://arxiv.org/abs/2407.20168
Autor:
Capatti, Zeno
I work out in full detail the derivation of the Cross-Free Family (CFF) representation for the box diagram, and highlight the differences with its Time Ordered Perturbation Theory (TOPT) representation. I briefly discuss implications for the threshol
Externí odkaz:
http://arxiv.org/abs/2311.14374
Publikováno v:
PoS Volume 432 - RADCOR2023
Flow Oriented Perturbation Theory (FOPT) is a novel approach to Feynman diagrams based on the coordinate (position) space description of Quantum Field Theories (QFT). FOPT offers interesting features regarding the computation of higher-loop Feynman a
Externí odkaz:
http://arxiv.org/abs/2310.09708
Autor:
Capatti, Zeno
The understanding of the physical laws determining the infrared behaviour of amplitudes is a longstanding and topical problem. In this paper, we show that energy conservation alone implies strong constraints on the threshold singularity structure of
Externí odkaz:
http://arxiv.org/abs/2211.09653
Publikováno v:
Journal of High Energy Physics, 172 (2023)
We introduce a new diagrammatic approach to perturbative quantum field theory, which we call flow-oriented perturbation theory (FOPT). Within it, Feynman graphs are replaced by strongly connected directed graphs (digraphs). FOPT is a coordinate space
Externí odkaz:
http://arxiv.org/abs/2210.05532
The Local Unitarity (LU) representation of differential cross-sections locally realises the cancellations of infrared singularities predicted by the Kinoshita-Lee-Nauenberg theorem. In this work we solve the two remaining challenges to enable practic
Externí odkaz:
http://arxiv.org/abs/2203.11038
Autor:
Capatti, Zeno
Publikováno v:
RADCOR 2021 (15th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology)
Within the Local Unitarity formalism, any physical cross-section is re-written in such a way that cancellations of infrared singularities between real and virtual contributions are realised locally. Consequently, phase-space and loop integrals are re
Externí odkaz:
http://arxiv.org/abs/2110.15662
We propose a novel representation of differential scattering cross-sections that locally realises the direct cancellation of infrared singularities exhibited by its so-called real-emission and virtual degrees of freedom. We take advantage of the Loop
Externí odkaz:
http://arxiv.org/abs/2010.01068
Loop-Tree Duality (LTD) is a framework in which the energy components of all loop momenta of a Feynman integral are integrated out using residue theorem, resulting in a sum over tree-like structures. Originally, the LTD expression exhibits cancellati
Externí odkaz:
http://arxiv.org/abs/2009.05509
We introduce a novel construction of a contour deformation within the framework of Loop-Tree Duality for the numerical computation of loop integrals featuring threshold singularities in momentum space. The functional form of our contour deformation a
Externí odkaz:
http://arxiv.org/abs/1912.09291