3 papers
quant-ph2026
Revisiting the Page curve and its moments. A combinatorial approach
Gero von Gersdorff
We revisit the calculation of the von Neumann (or "entanglement") entropy of a subsystem of a pure quantum state, under the assumption that the latter is drawn at random from a uni…
hep-th2024
The Heat Kernel in Riemann Normal Coordinates and Multiloop Feynman Graphs in Curved Spacetime
Igor Carneiro, Gero von Gersdorff
We present a formalism for computing arbitrary multi-loop Feynman graphs in curved spacetime using the heat kernel approach. To this end, we compute the off-diagonal components of…
hep-ph2023
Factorization of covariant Feynman graphs for the effective action
Gero von Gersdorff
We prove a neat factorization property of Feynman graphs in covariant perturbation theory. The contribution of the graph to the effective action is written as a product of a massle…