Landau's Leviathans
Abstract
We present a new method together with a proof-of-concept implementation for determining the Landau singularities of Feynman integrals, read off directly from where the Euler characteristic of the associated integral drops. Working over finite fields makes the requisite elimination tractable for multi-scale integrals at the multi-loop frontier. The algorithm returns the genuine and complete set of singularities, subject to a set of conditions which are practically testable. We apply these methods to classes of Feynman integrals beyond the reach of current methods, including non-planar six-point diagrams at two loops, as well as a fully massive three-loop envelope graph. Several of the newly found singularities, both in d- and 4-dimensional external kinematics, are of unexpected complexity when compared to previously known singularities for these examples.
Related
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BibTeX
@misc{chestnov2026landaus,
title = {{Landau's Leviathans}},
author = {Vsevolod Chestnov and Giulio Crisanti and Mathieu Giroux},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2606.29612},
eprint = {2606.29612},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.29612},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Landau's Leviathans
AU - Vsevolod Chestnov
AU - Giulio Crisanti
AU - Mathieu Giroux
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2606.29612
UR - https://arxiv.org/abs/2606.29612
AB - We present a new method together with a proof-of-concept implementation for determining the Landau singularities of Feynman integrals, read off directly from where the Euler characteristic of the associated integral drops. Working over finite fields makes the requisite elimination tractable for multi-scale integrals at the multi-loop frontier. The algorithm returns the genuine and complete set of singularities, subject to a set of conditions which are practically testable. We apply these methods to classes of Feynman integrals beyond the reach of current methods, including non-planar six-point diagrams at two loops, as well as a fully massive three-loop envelope graph. Several of the newly found singularities, both in d- and 4-dimensional external kinematics, are of unexpected complexity when compared to previously known singularities for these examples.
ER -