cppdlr: Imaginary time calculations using the discrete Lehmann representation
CoRR(2024)
摘要
We introduce cppdlr, a C++ library implementing the discrete Lehmann
representation (DLR) of functions in imaginary time and Matsubara frequency,
such as Green's functions and self-energies. The DLR is based on a low-rank
approximation of the analytic continuation kernel, and yields a compact and
explicit basis consisting of exponentials in imaginary time and simple poles in
Matsubara frequency. cppdlr constructs the DLR basis and associated
interpolation grids, and implements standard operations. It provides a flexible
yet high-level interface, facilitating the incorporation of the DLR into both
small-scale applications and existing large-scale software projects.
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