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Low-frequency nonphononic modes and plastic rearrangements in glasses arespatially quasilocalized, i.e. feature a disorder-induced short-range core andknown long-range decaying elastic fields. Extracting the unknown short-rangecore properties, potentially accessible in computer glasses, is of primeimportance. Here we consider a class of contour integrals, performed over theknown long-range fields, which are especially designed for extracting the coreproperties. We first show that in computer glasses of typical sizes used incurrent studies, the long-range fields of quasilocalized modes experienceboundary effects related to the simulation box shape and the widely employedperiodic boundary conditions. In particular, image interactions mediated by thebox shape and the periodic boundary conditions induce fields' rotation andorientation-dependent suppression of their long-range decay. We then develop acontinuum theory that quantitatively predicts these finite-size boundaryeffects and support it by extensive computer simulations. The theory accountsfor the finite-size boundary effects and at the same time allows the extractionof the short-range core properties, such as their typical strain ratios andorientation. The theory is extensively validated in both 2D and 3D. Overall,our results offer a useful tool for extracting the intrinsic core properties ofnonphononic modes and plastic rearrangements in computer glasses.

Extracting the properties of quasilocalized modes in computer glasses: Long-range continuum fields, contour integrals and boundary effects