A 4-point Feynman diagram in scalar theory is represented by a graph which is obtained from a connected 4-regular graph by deleting a vertex. The associated Feynman integral gives a quantity called the period of which is invariant under a number of meaningful graph operations – namely, planar duality, the Schnetz twist, and it also does not depend on the choice of vertex which was deleted to form .
In this article we study a graph invariant we call the graph permanent, which was implicitly introduced in a paper by Alon, Linial and Meshulam [1]. The graph permanent applies to any graph for which is a multiple of (so in particular to graphs obtained from a 4-regular graph by removing a vertex). We prove that the graph permanent, like the period, is invariant under planar duality and the Schnetz twist when these are valid operations, and we show that when is obtained from a -regular graph by deleting a vertex, the graph permanent does not depend on the choice of deleted vertex.
Publié le :
DOI : 10.4171/aihpd/35
Mots-clés : Permanent, Feynman graph, Feynman period
@article{AIHPD_2016__3_4_429_0, author = {Crump, Iain and DeVos, Matt and Yeats, Karen}, title = {Period preserving properties of an invariant from the permanent of signed incidence matrices}, journal = {Annales de l{\textquoteright}Institut Henri Poincar\'e D}, pages = {429--454}, volume = {3}, number = {4}, year = {2016}, doi = {10.4171/aihpd/35}, zbl = {1355.05117}, language = {en}, url = {http://archive.numdam.org/articles/10.4171/aihpd/35/} }
TY - JOUR AU - Crump, Iain AU - DeVos, Matt AU - Yeats, Karen TI - Period preserving properties of an invariant from the permanent of signed incidence matrices JO - Annales de l’Institut Henri Poincaré D PY - 2016 SP - 429 EP - 454 VL - 3 IS - 4 UR - http://archive.numdam.org/articles/10.4171/aihpd/35/ DO - 10.4171/aihpd/35 LA - en ID - AIHPD_2016__3_4_429_0 ER -
%0 Journal Article %A Crump, Iain %A DeVos, Matt %A Yeats, Karen %T Period preserving properties of an invariant from the permanent of signed incidence matrices %J Annales de l’Institut Henri Poincaré D %D 2016 %P 429-454 %V 3 %N 4 %U http://archive.numdam.org/articles/10.4171/aihpd/35/ %R 10.4171/aihpd/35 %G en %F AIHPD_2016__3_4_429_0
Crump, Iain; DeVos, Matt; Yeats, Karen. Period preserving properties of an invariant from the permanent of signed incidence matrices. Annales de l’Institut Henri Poincaré D, Tome 3 (2016) no. 4, pp. 429-454. doi : 10.4171/aihpd/35. http://archive.numdam.org/articles/10.4171/aihpd/35/
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