Zobrazeno 1 - 10
of 274
pro vyhledávání: '"Barnett, Alex"'
We present nifty-ls, a software package for fast and accurate evaluation of the Lomb-Scargle periodogram. nifty-ls leverages the fact that Lomb-Scargle can be computed using a non-uniform FFT (NUFFT), which we evaluate with the Flatiron Institute NUF
Externí odkaz:
http://arxiv.org/abs/2409.08090
The method of fundamental solutions (MFS) is known to be effective for solving 3D Laplace and Stokes Dirichlet boundary value problems in the exterior of a large collection of simple smooth objects. Here we present new scalable MFS formulations for t
Externí odkaz:
http://arxiv.org/abs/2409.04215
We present an automatic, high-order accurate, and adaptive Brillouin zone integration algorithm for the calculation of the optical conductivity with a non-zero but small broadening factor $\eta$, focusing on the case in which a Hamiltonian in a downf
Externí odkaz:
http://arxiv.org/abs/2406.15466
Stokes flows with near-touching rigid particles induce near-singular lubrication forces under relative motion, making their accurate numerical treatment challenging. With the aim of controlling the accuracy with a computationally cheap method, we pre
Externí odkaz:
http://arxiv.org/abs/2407.03343
A direct solver is introduced for solving overdetermined linear systems involving nonuniform discrete Fourier transform matrices. Such a matrices can be transformed into a Cauchy-like form that has hierarchical low rank structure. The rank structure
Externí odkaz:
http://arxiv.org/abs/2404.13223
Autor:
Agocs, Fruzsina J., Barnett, Alex H.
We present a high-order boundary integral equation (BIE) method for the frequency-domain acoustic scattering of a point source by a singly-periodic, infinite, corrugated boundary. We apply it to the accurate numerical study of acoustic radiation in t
Externí odkaz:
http://arxiv.org/abs/2310.12486
Autor:
Malhotra, Dhairya, Barnett, Alex
The interaction of fibers in a viscous (Stokes) fluid plays a crucial role in industrial and biological processes, such as sedimentation, rheology, transport, cell division, and locomotion. Numerical simulations generally rely on slender body theory
Externí odkaz:
http://arxiv.org/abs/2310.00889
The high efficiency of a recently proposed method for computing with Gaussian processes relies on expanding a (translationally invariant) covariance kernel into complex exponentials, with frequencies lying on a Cartesian equispaced grid. Here we prov
Externí odkaz:
http://arxiv.org/abs/2305.11065
An adaptive spectral method for oscillatory second-order linear ODEs with frequency-independent cost
Autor:
Agocs, Fruzsina J., Barnett, Alex H.
We introduce an efficient numerical method for second order linear ODEs whose solution may vary between highly oscillatory and slowly changing over the solution interval. In oscillatory regions the solution is generated via a nonoscillatory phase fun
Externí odkaz:
http://arxiv.org/abs/2212.06924
Autor:
Tang, Wai Shing, Silva-Sánchez, David, Giraldo-Barreto, Julian, Carpenter, Bob, Hanson, Sonya, Barnett, Alex H., Thiede, Erik H., Cossio, Pilar
Cryo-electron microscopy (cryo-EM) has recently become a premier method for obtaining high-resolution structures of biological macromolecules. However, it is limited to biomolecular samples with low conformational heterogeneity, where all the conform
Externí odkaz:
http://arxiv.org/abs/2212.05320