Massive Photons: An Infrared Regularization Scheme for Lattice
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PhysRevLett.117.072002.pdf
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518.23 KB
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Author(s)
Shindler, Andrea
Tiburzi, Brian C.
Walker-Loud, André
Endres, Michael G
Date Issued
August 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Endres, Michael G.; Shindler, Andrea; Tiburzi, Brian C. and Walker-Loud, André. "Massive Photons: An Infrared Regularization Scheme for Lattice." Physical Review Letters 117, 072002 (August 2016): 1-6 © 2016 American Physical Society
Version
Final published version
Abstract
Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by extrapolation requires costly computations at multiple volumes. We introduce a photon mass to alternatively regulate the infrared, and rely on effective field theory to remove its unphysical effects. Electromagnetic modifications to the hadron spectrum are reliably estimated with a precision and cost comparable to conventional approaches that utilize multiple larger volumes. A significant overall cost advantage emerges when accounting for ensemble generation. The proposed method may benefit lattice calculations involving multiple charged hadrons, as well as quantum many-body computations with long-range Coulomb interactions.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.117.072002
