68 citations · 122 across the 12 of their papers we have counts for
12 papers
Leveraging data-driven weather models for improving numerical weather prediction skill through large-scale spectral nudging
Syed Zahid Husain, Leo Separovic, Jean-François Caron +9
Operational meteorological forecasting has long relied on physics-based numerical weather prediction (NWP) models. Recently, this landscape has faced disruption by the advent of da…
Addendum: Hidden symmetries, trivial conservation laws and Casimir invariants in geophysical fluid dynamics (2018 J. Phys. Commun. 2 115018)
Martin Charron, Ayrton Zadra
An extension is proposed to the internal symmetry transformations associated with mass, entropy and other Clebsch-related conservation in geophysical fluid dynamics. Those symmetry…
On the dissociation between potential vorticity conservation and symmetries
Martin Charron, Ayrton Zadra
Using a four-dimensional manifestly covariant formalism suitable for classical fluid dynamics, it is shown that the conservation of potential vorticity is not associated with any s…
Non-trivial and trivial conservation laws in covariant formulations of geophysical fluid dynamics
Martin Charron, Ayrton Zadra
Using a manifestly invariant Lagrangian density based on Clebsch fields and suitable for geophysical fluid dynamics, the conservation of mass, entropy, momentum and energy, and the…
Algebra of non-local charges in the O(N) WZNW model at and beyond criticality
L. E. Saltini, A. Zadra
We derive the classical algebra of the non-local conserved charges in the O(N) WZNW model and analyze its dependence on the coupling constant of the Wess-Zumino term. As in the non…
Classical and quantum N=1 super -algebras
L. O. Buffon, D. Dalmazi, A. Zadra
We construct higher-spin N=1 super algebras as extensions of the super Virasoro algebra containing generators for all spins . We find two distinct classical (Poisson) alg…
Higher spin constraints and the super algebra in the super eigenvalue model
L. O. Buffon, D. Dalmazi, A. Zadra
We show that the partition function of the super eigenvalue model satisfies an infinite set of constraints with even spins . These constraints are associated w…
Screening in Two-dimensional QCD
E. Abdalla, R. Mohayaee, A. Zadra
We discuss the issue of screening and confinement of external colour charges in bosonised two-dimensional quantum chromodynamics. Our computation relies on the static solutions of…
Algebra of Non-Local Charges in Supersymmetric Non-Linear Sigma Models
L. E. Saltini, A. Zadra
We propose a graphic method to derive the classical algebra (Dirac brackets) of non-local conserved charges in the two dimensional supersymmetric non-linear sigma model. As…
Non-critical superstrings: a comparison between continuum and discrete approaches
A. Zadra, E. Abdalla
We review the relation between the matrix model and Liouville approaches to two-dimensional gravity as elaborated by Moore, Seiberg and Staudacher. Then, based on the supersymmetri…
The Algebra of Non-Local Charges in Non-Linear Sigma Models
E. Abdalla, M. C. B. Abdalla, J. C. Brunelli +1
We obtain the exact Dirac algebra obeyed by the conserved non-local charges in bosonic non-linear sigma models. Part of the computation is specialized for a symmetry group .…
Superloop Equations and Two Dimensional Supergravity
L. Alvarez-Gaume, H. Itoyama, J. L. Manes +1
We propose a discrete model whose continuum limit reproduces the string susceptibility and the scaling dimensions of -minimal superconformal models coupled to -supergra…