The Adiabatic b-Calculus and the Global Anomaly Formula on Manifolds with Boundary
Abstract
We study the determinant line bundle for a family of elliptic operators on compact manifolds with boundary with the associated Quillen metric and Bismut-Freed connection, and we prove the global anomaly formula in this context. This extends Witten's holonomy theorem to manifolds with boundary. Witten studied the limiting behavior of the eta invariant of a Dirac operator on the total space of a fibration over π1 when the metric in the base π1 is blown up in a certain manner, a process known as taking the adiabatic limit. In this paper, we construct the calculus of adiabatic b-pseudodifferential operators, which naturally synthesizes the b-calculus and the adiabatic calculus of pseudodifferential operators. Using this calculus, and assuming the fiber operators to be invertible, we compute the adiabatic limit of the natural eta invariant in this setting and relate it to the integral of the Bismut-Freed connection and new correction terms coming from the boundary of the fibers.
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BibTeX
@misc{nelson2026adiabatic,
title = {{The Adiabatic b-Calculus and the Global Anomaly Formula on Manifolds with Boundary}},
author = {Chad Nelson},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.16938},
eprint = {2610.16938},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.16938},
}
RIS
TY - UNPB
TI - The Adiabatic b-Calculus and the Global Anomaly Formula on Manifolds with Boundary
AU - Chad Nelson
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.16938
UR - https://arxiv.org/abs/2610.16938
AB - We study the determinant line bundle for a family of elliptic operators on compact manifolds with boundary with the associated Quillen metric and Bismut-Freed connection, and we prove the global anomaly formula in this context. This extends Witten's holonomy theorem to manifolds with boundary. Witten studied the limiting behavior of the eta invariant of a Dirac operator on the total space of a fibration over π^1 when the metric in the base π^1 is blown up in a certain manner, a process known as taking the adiabatic limit. In this paper, we construct the calculus of adiabatic b-pseudodifferential operators, which naturally synthesizes the b-calculus and the adiabatic calculus of pseudodifferential operators. Using this calculus, and assuming the fiber operators to be invertible, we compute the adiabatic limit of the natural eta invariant in this setting and relate it to the integral of the Bismut-Freed connection and new correction terms coming from the boundary of the fibers.
ER -