Results 21 to 30 of about 274,225 (273)

On the dualization of Born–Infeld theories

Physics Letters B, 2015
We construct a general Lagrangian, quadratic in the field strengths of n abelian gauge fields, which interpolates between BI actions of n abelian vectors and actions, quadratic in the vector field-strengths, describing Maxwell fields coupled to non ...
Laura Andrianopoli, Riccardo D'Auria, Mario Trigiante   +2 more
doaj   +1 more source

Delayed stability switches in singularly perturbed predator-prey models [PDF]

, 2016
In this paper we provide an elementary proof of the existence of canard solutions for a class of singularly perturbed predator-prey planar systems in which there occurs a transcritical bifurcation of quasi steady states.
Banasiak, J., Tchamga, M. S. Seuneu
core   +2 more sources

Abelian integrals of quadratic hamiltonian vector fields with an invariant straight line [PDF]

, 1995
We prove that the lowest upper bound for the number of isolated zeros of the Abelian integrals associated to quadratic Hamiltonian vector fields having a center and an invariant straight line after quadratic perturbations is ...
Li, Chengzhi, Llibre, Jaume, Zhang, Zhifen   +2 more
core   +2 more sources

Liu-type pretest and shrinkage estimation for the conditional autoregressive model.

PLoS ONE, 2023
Spatial regression models have recently received a lot of attention in a variety of fields to address the spatial autocorrelation effect. One important class of spatial models is the Conditional Autoregressive (CA). Theses models have been widely used to
Marwan Al-Momani
doaj   +1 more source

Higgsed Stueckelberg vector and Higgs quadratic divergence

Physics Letters B, 2015
Here we show that, a hidden vector field whose gauge invariance is ensured by a Stueckelberg scalar and whose mass is spontaneously generated by the Standard Model Higgs field contributes to quadratic divergences in the Higgs boson mass squared, and even
Durmuş Ali Demir, Canan Nurhan Karahan, Beste Korutlu   +2 more
doaj   +1 more source

Form factors and decoupling of matter fields in four-dimensional gravity

Physics Letters B, 2019
We extend previous calculations of the non-local form factors of semiclassical gravity in 4D to include the Einstein–Hilbert term. The quantized fields are massive scalar, fermion and vector fields.
Sebastián A. Franchino-Viñas, Tibério de Paula Netto, Ilya L. Shapiro, Omar Zanusso   +3 more
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Quadratic Killing tensors on symmetric spaces which are not generated by Killing vector fields

Comptes Rendus. Mathématique
Every Killing tensor field on the space of constant curvature and on the complex projective space can be decomposed into the sum of symmetric tensor products of Killing vector fields (equivalently, every polynomial in velocities integral of the geodesic ...
Matveev, Vladimir S., Nikolayevsky, Yuri
doaj   +1 more source

3-dimensional piecewise linear and quadratic vector fields with invariant spheres

Electronic Journal of Qualitative Theory of Differential Equations
We consider the class $\mathcal{X}$ of $3$-dimensional piecewise smooth vector fields that admit a first integral which leaves invariant any sphere centered at the origin.
Claudio Buzzi, Ana Livia Rodero, Joan Torregrosa   +2 more
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First integrals and phase portraits of planar polynomial differential cubic systems with invariant straight lines of total multiplicity eight

Electronic Journal of Qualitative Theory of Differential Equations, 2017
In the article [C. Bujac, J. Llibre, N. Vulpe, Qual. Theory Dyn. Syst. 15(2016), 327–348] for the family of cubic differential systems with the maximum number of invariant straight lines, i.e.
Cristina Bujac, Nicolae Vulpe
doaj   +1 more source

Reducibility of Valence-3 Killing Tensors in Weyl's Class of Stationary and Axially Symmetric Space-Times

, 2015
Stationary and axially symmetric space-times play an important role in astrophysics, particularly in the theory of neutron stars and black holes. The static vacuum sub-class of these space-times is known as Weyl's class, and contains the Schwarzschild ...
Vollmer, Andreas
core   +1 more source