47 citations · 149 across the 12 of their papers we have counts for
14 papers
Renormalization of U(1) Gauge Boson Kinetic Mixing
Felix Forner, Felix Tellander
Quantum field theories containing fields with the same quantum numbers allow for mixed kinetic terms in the Lagrangian, leading to off-diagonal elements in the tree-level two-point…
Characterizing Cohen-Macaulay One-Loop Feynman Integrals
Kyrill Michaelsen, Felix Tellander
We study the generalized hypergeometric systems, in the sense of Gel'fand, Kapranov, and Zelevinsky, associated with one-loop Feynman integrals, and determine when their rank is in…
Geometric Singularities of Feynman Integrals
Martin Helmer, Felix Tellander
We provide a new method to calculate the full microlocal description of singularities of Feynman integrals. This is done by associating a unique constructible function to the syste…
Spectral Decomposition of Euler-Mellin Integrals
Martin Helmer, Felix Tellander
We consider the spectral decomposition of singularities of integrals and their integrands. Our results apply to any integral of Euler-Mellin type, and thus especially to every scal…
The two-loop Amplituhedron
Gabriele Dian, Elia Mazzucchelli, Felix Tellander
The loop-Amplituhedron is a semialgebraic set in the product of Grassmannians . Recently, many aspects of this geometry for…
Landau Singularities from Whitney Stratifications
Martin Helmer, Georgios Papathanasiou, Felix Tellander
We demonstrate that the complete and non-redundant set of Landau singularities of Feynman integrals may be explicitly obtained from the Whitney stratification of a certain map. As…
UV-complete Gauged Anomaly-free U(1) Froggatt-Nielsen Model
Johan Rathsman, Felix Tellander
We investigate the possibility of understanding all fermion masses and mixings within a gauged Froggatt-Nielsen framework. Continuing the work from [J. Rathsman and F. Tellander, P…
Tropical Feynman integration in the physical region
Michael Borinsky, Henrik J. Munch, Felix Tellander
The software feyntrop for direct numerical evaluation of Feynman integrals is presented. We focus on the underlying combinatorics and polytopal geometries facilitating these method…
Symbol Alphabets from the Landau Singular Locus
Christoph Dlapa, Martin Helmer, Georgios Papathanasiou +1
We provide evidence through two loops, that rational letters of polylogarithmic Feynman integrals are captured by the Landau equations, when the latter are recast as a polynomial o…
Tropical Feynman integration in the Minkowski regime
Michael Borinsky, Henrik J. Munch, Felix Tellander
We present a new computer program, , which uses the tropical geometric approach to evaluate Feynman integrals numerically. In order to apply this approach in the…
Cohen-Macaulay Property of Feynman Integrals
Felix Tellander, Martin Helmer
The connection between Feynman integrals and GKZ -hypergeometric systems has been a topic of recent interest with advances in mathematical techniques and computational tools ope…
On the Uniqueness Problem for Quadrature Domains
Yacin Ameur, Martin Helmer, Felix Tellander
We study questions of existence and uniqueness of quadrature domains using computational tools from real algebraic geometry. These problems are transformed into questions about the…
Anomaly-free Model Building with Algebraic Geometry
Johan Rathsman, Felix Tellander
We present a method to find anomaly-free gauged Froggatt-Nielsen type models using results from algebraic geometry. These methods should be of general interest for model building b…
Tertiary particle production and target optimization of the H2 beam line in the SPS North Area
Felix Tellander, Nikolaos Charitonidis
In this note, the tertiary particle yield from secondary targets of different materials placed at the 'filter' position of the H2 beam line of SPS North Area are presented. The pro…