Results 21 to 30 of about 441,203 (334)
Saddle point inflation from f(R) theory
Physics Letters B, 2015 We analyse several saddle point inflationary scenarios based on power-law f(R) models. We investigate inflation resulting from f(R)=R+αnM2(1−n)Rn+αn+1M−2nRn+1 and f(R)=∑nlαnM2(1−n)Rn as well as l→∞ limit of the latter. In all cases we have found relation
Michał Artymowski +2 more
doaj +1 more source
Numerical Resolution of Fluid Dynamic Problems Using a Saddle Point Variational Formulation
Chemical Engineering Transactions, 2019 Variational methods are useful for finding numerical solutions of differential equations, which are the corresponding Euler-Lagrange equations to the stationary condition of the functional. Usually the functional is a maximum or a minimum with respect to
Reginaldo Guirardello
doaj +1 more source
Saddle point inflation in string-inspired theory [PDF]
, 2015 The observed value of the Higgs mass indicates the possibility that there is no supersymmetry below the Planck scale and that the Higgs can play the role of the inflaton.
Hamada, Yuta +2 more
core +2 more sources
Three effective preconditioners for double saddle point problem
AIMS Mathematics, 2021 In this paper, we mainly propose three preconditioners for solving double saddle point problems, which arise from some practical problems. Firstly, the solvability of this kind of problem is investigated under suitable assumption. Next, we prove that all
Yuwen He, Jun Li, Lingsheng Meng
doaj +1 more source
A Theoretical Framework for Lagrangian Descriptors [PDF]
, 2017 This paper provides a theoretical background for Lagrangian Descriptors (LDs). The goal of achieving rigourous proofs that justify the ability of LDs to detect invariant manifolds is simplified by introducing an alternative definition for LDs.
Balibrea-Iniesta, Francisco +4 more
core +3 more sources
Mathematical analysis for classical Chua's circuit with two nonlinear resistors [PDF]
Songklanakarin Journal of Science and Technology (SJST), 2020 We formulate a mathematical model for the classical Chua’s circuit with two nonlinear resistors in terms of a system of nonlinear ordinary differential equations.
Natchaphon Limphodaen +1 more
doaj +1 more source
The construction of one unstable manifold for the dissipative Henon mapping [PDF]
, 1984 The unstable manifold of a saddle point of the Henon mapping is constructed analytically via a contraction mapping, for a range of parameter values where the second fixed point is a stable node.
Valkering, Theo
core +3 more sources
A parameterized shift-splitting preconditioner for saddle point problems
Mathematical Biosciences and Engineering, 2019 Recently, Chen and Ma [A generalized shift-splitting preconditioner for saddle point problems, Applied Mathematics Letters, 43 (2015) 49-55] introduced a generalized shift-splitting preconditioner for saddle point problems with symmetric positive ...
Li-Tao Zhang , Chao-Qian Li, Yao-Tang Li
doaj +1 more source
On semidifferentiable interval-valued programming problems
Journal of Inequalities and Applications, 2021 In this paper, we consider the semidifferentiable case of an interval-valued minimization problem and establish sufficient optimality conditions and Wolfe type as well as Mond–Weir type duality theorems under semilocal E-preinvex functions.
Kin Keung Lai +2 more
doaj +1 more source
Mathematical Modelling and Analysis, 2022 A new variational approach for a boundary value problem in mathematical physics is proposed. By considering two-field Lagrange multipliers, we deliver a variational formulation consisting of a mixed variational problem which is equivalent with a saddle ...
Mariana Chivu Cojocaru, Andaluzia Matei
doaj +1 more source