Results 31 to 40 of about 2,402 (140)

Toric amplitudes and universal adjoints

Journal of the London Mathematical Society, Volume 113, Issue 2, February 2026.
Abstract A toric amplitude is a rational function associated with a simplicial polyhedral fan. The definition is inspired by scattering amplitudes in particle physics. We prove algebraic properties of such amplitudes and study the geometry of their zero loci. These hypersurfaces play the role of Warren's adjoint via a dual volume interpretation.
Simon Telen
wiley   +1 more source

Semiclassical Spectra and Diagonal Matrix Elements by Harmonic Inversion of Cross-Correlated Periodic Orbit Sums

, 1999
Semiclassical spectra weighted with products of diagonal matrix elements of operators A_{alpha}, i.e., g_{alpha alpha'}(E) = sum_n /(E-E_n) are obtained by harmonic inversion of a cross-correlation signal constructed of classical periodic orbits.
Main, J., Mandelshtam, V. A., Weibert, K., Wunner, G.   +3 more
core   +1 more source

Gaussian-based techniques for quantum propagation from the time-dependent variational principle: Formulation in terms of trajectories of coupled classical and quantum variables [PDF]

, 2008
In this article, two coherent-state based methods of quantum propagation, namely, coupled coherent states (CCS) and Gaussian-based multiconfiguration time-dependent Hartree (G-MCTDH), are put on the same formal footing, using a derivation from a ...
Burghardt, I., Shalashilin, D.V.
core   +1 more source

Physicochemical Characterization of Solid Catalysts: Morphological, Structural, Textural, Reducibility, and Acid‐Base Insights

ChemCatChem, Volume 17, Issue 23, December 8, 2025.
This review provides a practical guide for the characterization of solid catalysts, emphasizing key techniques such as SEM, TEM, XRD, Raman spectroscopy, and gas physisorption. It also covers reducibility and acid‐based analyses through TPR, TPD, and FTIR.
Luis A. Gallego‐Villada, Julieth T. García‐Sánchez, Gabriela Lauer, Päivi Mäki‐Arvela, Julián E. Sánchez‐Velandia, Dmitry Yu. Murzin   +5 more
wiley   +1 more source

Semiclassical time--dependent propagation in three dimensions: How accurate is it for a Coulomb potential?

, 1998
A unified semiclassical time propagator is used to calculate the semiclassical time-correlation function in three cartesian dimensions for a particle moving in an attractive Coulomb potential.
B. W. Spath, F. Großmann, F. Großmann, Gerd van de Sand, H. Kleinert, I. M. Suárez Barnes, I. M. Suárez Barnes, Jan M. Rost, K. G. Kay, K. G. Kay, M. F. Herman, M. R. Wall, R. S. Manning, S. Garashchuk, V. A. Mandelshtam, V. A. Mandelshtam   +15 more
core   +1 more source

Holomorphic field theories and higher algebra

Bulletin of the London Mathematical Society, Volume 57, Issue 10, Page 2903-2974, October 2025.
Abstract Aimed at complex geometers and representation theorists, this survey explores higher dimensional analogs of the rich interplay between Riemann surfaces, Virasoro and Kac‐Moody Lie algebras, and conformal blocks. We introduce a panoply of examples from physics — field theories that are holomorphic in nature, such as holomorphic Chern‐Simons ...
Owen Gwilliam, Brian R. Williams
wiley   +1 more source

The category of time in the poetry of O. Mandelstam

RUDN Journal of Studies in Literature and Journalism, 2014
This article reveals the meaning of the category of time, which is cultural history and philosophical category in poetry of O. Mandelshtam. Ancient cultures exist in culture and the arts always.
A V Khlystova
doaj  

Photoabsorption spectra of the diamagnetic hydrogen atom in the transition regime to chaos: Closed orbit theory with bifurcating orbits

, 2004
With increasing energy the diamagnetic hydrogen atom undergoes a transition from regular to chaotic classical dynamics, and the closed orbits pass through various cascades of bifurcations.
Abramowitz M, Bartsch T, Bartsch T, Bartsch T, Bartsch T, Berry M V, Berry M V, Bogomolny E B, Brack M, Brack M, Connor J N L, Connor J N L, Du M L, Einstein A, Fab?i? T, Gao J, Gao J, Gao J, Gutzwiller M C, Günter Wunner, Hasegawa H, Jörg Main, Kaidel J, Karremans K, Kips A, Kips A, Main J, Main J, Main J, Main J, Main J, Main J, Main J, Main J, Mao J M, Poston T, Sadovskií D A, Schomerus H, Shaw J A, Sieber M, Thomas Bartsch, Tomaž Fabčič, Watanabe S   +42 more
core   +1 more source

Global Lunar Boulder Map From LRO NAC Optical Images Using Deep Learning: Implications for Regolith and Protolith

Journal of Geophysical Research: Planets, Volume 130, Issue 7, July 2025.
Abstract Boulders on the lunar surface indicate relatively recent surface activity, related to mass wasting or bedrock excavation by impact cratering, and degrade over time, producing regolith. Previously, the distribution of boulders was indirectly assessed using the anisothermality effects observed by the Lunar Reconnaissance Orbiter (LRO) Diviner ...
B. Aussel, O. Rüsch, B. Gundlach, V. T. Bickel, S. Kruk, E. Sefton‐Nash   +5 more
wiley   +1 more source

Application of digital technique to the spectral analysis of Mandelshtam-Brjllouin scattered light

Archives of Acoustics, 2015
The experimentally recorded Mandelshtam-Brillouin type light scattering function is in general a convolution of the real scattering function and the overall instrumental function, accounting for all the deformations introduced by the measuring ...
Tomasz HORNOWSKI, Mikołaj ŁABOWSKI
doaj