Results 61 to 70 of about 1,461,044 (179)
Phantom energy from graded algebras
, 2006 We construct a model of phantom energy using the graded Lie algebra SU(2/1). The negative kinetic energy of the phantom field emerges naturally from the graded Lie algebra, resulting in an equation of state with ...
Ahluwalia-Khalilova D. V. +6 more
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Injective mappings and solvable vector fields
Anais da Academia Brasileira de Ciências, 2010 We establish a sufficient condition for injectivity in a class of mappings defined on open connected subsets of Rn , for arbitrary n. The result relates solvability of the appropriate vector fields with injectivity of the mapping and extends a result ...
José R. dos Santos Filho +1 more
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Global Observer for Homogegeous Vector Fields
Nonlinear Analysis, 2005 This paper presents an algebraic approach to the problem of nonlinear observer design. We show, that an observer which converges globally and asymptotically can be designed for a class of homogeneous systems of odd degree.
M. A. Hammami
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Lagrangian vector field and Lagrangian formulation of partial differential equations
Condensed Matter Physics, 2005 In this paper we consider the Lagrangian formulation of a system of second order quasilinear partial differential equations. Specifically we construct a Lagrangian vector field such that the flows of the vector field satisfy the original system of ...
M.Chen
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A new mass relation among the hadron vector resonances [PDF]
, 2001 We show that the hadron vector resonances are described by fields transforming according to different inequivalent representations of the Lorentz group: (1/2,1/2) and (1,0)+(0,1). The vector representation (1/2,1/2) is well studied and corresponds to the
Chizhov, M. V.
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Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2015 It is shown that a simple postulate ``The displacement field of the vacuum is a normalized electric field'', is equivalent to three parametric representation of the displacement field of the vacuum: $$ u(x;t) = P(x) \cos k(x)t + Q(x) \sin k(x)t. $$ Here $
Galimzian G Islamov
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Vector Fields on the Space of Functions Univalent Inside the Unit Disk via Faber Polynomials
Symmetry, Integrability and Geometry: Methods and Applications, 2009 We obtain the Kirillov vector fields on the set of functions $f$ univalent inside the unit disk, in terms of the Faber polynomials of $1/f(1/z)$. Our construction relies on the generating function for Faber polynomials.
Helene Airault
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Quadratic Hamiltonian Vector Fields
Journal of Differential Equations, 1994 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Artes, J.C., Llibre, J.
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Parabolic equations relative to vector fields
Electronic Journal of Differential Equations, 2008 We define two notions of viscosity solutions to parabolic equations defined using vector fields, depending on whether the test functions concern only the past or both the past and the future. Using the parabolic maximum principle for vector fields, we
Thomas Bieske
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VECTOR FIELD AND INFLATION [PDF]
International Journal of Modern Physics: Conference Series, 2011 We have investigated if the vector field can give rise to an accelerating phase in the early universe. We consider a timelike vector field with a general quadratic kinetic term in order to preserve an isotropic background spacetime. The vector field potential is required to satisfy the three minimal conditions for successful inflation: i) ρ > 0, ii)
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