Results 31 to 40 of about 781,511 (291)
Symbolic computation of variational symmetries in optimal control [PDF]
, 2006 We use a computer algebra system to compute, in an efficient way, optimal control variational symmetries up to a gauge term. The symmetries are then used to obtain families of Noether's first integrals, possibly in the presence of nonconservative ...
André Gomes-dos-Santos +17 more
core +3 more sources
Symbolic Computation of Polynomial Conserved Densities, Generalized Symmetries, and Recursion Operators for Nonlinear Differential-Difference Equations [PDF]
, 2004 Algorithms for the symbolic computation of polynomial conserved densities, fluxes, generalized symmetries, and recursion operators for systems of nonlinear differential-difference equations are presented. In the algorithms we use discrete versions of the
Jan A. S +15 more
core +1 more source
λ-symmetries for discrete equations [PDF]
Journal of Physics A: Mathematical and Theoretical, 2010 10 ...
Levi, D., Rodriguez, M. A.
openaire +1 more source
Discrete symmetries of Dirac’s theory in the de Sitter manifold
European Physical Journal C: Particles and Fields, 2023 The discrete symmetries of Dirac’s free field on the de Sitter manifold are studied, taking into account that this has two portions that can play the role of physical space-times, namely an expanding and a collapsing universe.
Ion I. Cotăescu, Ion Cotăescu
doaj +1 more source
Discrete theta angles, symmetries and anomalies
SciPost Physics, 2021 Gauge theories in various dimensions often admit discrete theta angles, that arise from gauging a global symmetry with an additional symmetry protected topological (SPT) phase.
Po-Shen Hsin, Ho Tat Lam
doaj +1 more source
Green-Schwarz automorphisms and 6D SCFTs
Journal of High Energy Physics, 2018 All known interacting 6D superconformal field theories (SCFTs) have a tensor branch which includes anti-chiral two-forms and a corresponding lattice of string charges.
Fabio Apruzzi +2 more
doaj +1 more source
Artificial molecular machines and motors—Design and control of nanoscale motion
FEBS Letters, EarlyView.Molecules are constantly moving because of thermal fluctuations, but random motion alone cannot be exploited to perform directional tasks. Artificial molecular machines use chemical, electrical, or light energy to bias this motion. Molecular shuttles, rotary motors, and supramolecular pumps illustrate how nanoscale movement can be controlled and ...
Leonardo Andreoni, Alberto Credi
wiley +1 more source
Molecular Oncology, EarlyView.Arginine methylation can be viewed as a persistence‐prone post‐translational modification regulated by a network of PRMTs. Competitive and compensatory interactions among PRMTs can redistribute methylation across substrate pools shaped by sequence, structural, spatial, and environmental layers, reinforcing RNA‐processing, chromatin, and signaling ...
So Hyun Kwon, Ji Min Lee
wiley +1 more source
Discrete symmetries in dynamo reversals [PDF]
Physics of Plasmas, 2017 Quantification of the velocity and magnetic field reversals in dynamo remains an interesting challenge. In this paper, using group-theoretic analysis, we classify the reversing and non-reversing Fourier modes during a dynamo reversal in a Cartesian box.
Riddhi Bandyopadhyay, Mahendra K. Verma
openaire +3 more sources
Metastability of Discrete-Symmetry Flocks
Physical Review Letters, 2023 We study the stability of the ordered phase of flocking models with a scalar order parameter. Using both the active Ising model and a hydrodynamic description, we show that droplets of particles moving in the direction opposite to that of the ordered phase nucleate and grow.
Benvegnen, Brieuc +8 more
openaire +3 more sources