Results 21 to 30 of about 2,737 (182)
Eigenvalues and eigenvectors of finite, low rank perturbation of large random matrices [PDF]
, 2009 In this paper, we consider the eigenvalues and eigenvectors of finite, low rank perturbations of random matrices. Specifically, we prove almost sure convergence of the extreme eigenvalues and appropriate projections of the corresponding eigenvectors ...
Nadakuditi, Raj Rao +1 more
core
A partial envelope approach for modelling multivariate spatial‐temporal data
Canadian Journal of Statistics, EarlyView.Abstract In the new era of big data, modelling multivariate spatial‐temporal data is a challenging task due to both the high dimensionality of the features and complex associations among the responses across different locations and time points.
Reisa Widjaja +3 more
wiley +1 more source
Journal of Applied Econometrics, EarlyView.ABSTRACT We present four novel tests of equal predictive accuracy and encompassing á Pitarakis (2023, 2025) for factor‐augmented regressions. Factors are estimated using cross‐section averages (CAs) of grouped series and our theoretical findings are empirically relevant: asymptotic normality, robustness to an overspecification of the number of factors,
Alessandro Morico, Ovidijus Stauskas
wiley +1 more source
An explicit formula for singular values of the Sylvester–Kac matrix
, 2007 The object of our interest is a certain tridiagonal matrix that appears in a variety of problems in statistical mechanics and quantum physics, such as the Brownian motion, random walk on a hypercube, the Ehrenfest urn model, and the Stark effect of the ...
Boros, Tibor, Rózsa, Pál
core +1 more source
NTECARS: A Nonthermal Equilibrium CARS Spectra Fitting Code
Journal of Raman Spectroscopy, EarlyView.We present NTECARS, an open‐source code written in Julia for the calculation and fitting of CARS spectra under nonequilibrium conditions. Rovibrational distributions can be flexibly modeled and fitted for different use cases. The code currently implements CO2$$ \mathrm{C}{\mathrm{O}}_2 $$ and N2$$ {\mathrm{N}}_2 $$ molecules and is validated under ...
Christian A. Busch, Uwe Czarnetzki
wiley +1 more source
Resonant States Reveal Strong Light–Matter Coupling in Nanophotonic Cavities
Laser &Photonics Reviews, EarlyView.Photonic resonant states reveal characteristics of coupled light–matter systems that would otherwise be hidden by damping. Their trajectories (when tuning the optical resonance) undergo a qualitative change at the onset of strong coupling: They start swapping positions.
Jan David Fischbach +5 more
wiley +1 more source
Diagnosing non-Hermitian many-body localization and quantum chaos via singular value decomposition [PDF]
peer reviewedStrong local disorder in interacting quantum spin chains can turn delocalized eigenmodes into localized eigenstates, giving rise to many-body localized phases.
CHENU, Aurélia +3 more
core +2 more sources
Investigation and development of DSP algorithms/hardware for real time power spectral density estimation [PDF]
, 1993 This research is concerned with the Power Spectrum Density Estimation with em- phasIze on the bigh-resolution algorithms and their real-time implementations. Tl-ie classical PSD estimation methods are fast and robust.
Sung-Yuan, Ko
core
Revealing the Resonant Physics of Open Photonic Time Crystals
Laser &Photonics Reviews, EarlyView.ABSTRACT Photonic time crystals (PTCs) are media whose permittivity is modulated periodically in time, enabling momentum bandgaps and parametric amplification of light. Their realization at the nanoscale can revolutionize the study of light‐matter interactions.
Adrià Canós Valero +5 more
wiley +1 more source
An overview of parallel algorithms for the singular value and symmetric eigenvalue problems
, 1989 Solving dense symmetric eigenvalue problems and computing singular value decompositions continue to be two of the most dominating tasks in numerous scientific applications.
Sameh, Ahmed, Berry, Michael
core +1 more source