Results 11 to 20 of about 238,932 (290)
Cosmological Perturbations and the Weinberg Theorem
Journal of Cosmology and Astroparticle Physics, 2015 The celebrated Weinberg theorem in cosmological perturbation theory states that there always exist two adiabatic scalar modes in which the comoving curvature perturbation is conserved on super-horizon scales.
Akhshik, Mohammad +2 more
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Gordon type theorem for measure perturbation
Electronic Journal of Differential Equations, 2011 Generalizing the concept of Gordon potentials to measures we prove a version of Gordon's theorem for measures as potentials and show absence of eigenvalues for these one-dimensional Schrodinger operators.
Christian Seifert
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A new minimax theorem and a perturbed James's theorem [PDF]
Bulletin of the Australian Mathematical Society, 2002 The main result of this paper is a sufficient condition for the minimax relation to hold for the canonical bilinear form on X × Y, where X is a nonempty convex subset of a real locally convex space and Y is a nonempty convex subset of its dual. Using the known “converse minimax theorem”, this result leads easily to a nonlinear generalisation of James's
Ruiz Galán, M., Simons, S.
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The Theorems Of Perturbative QCD [PDF]
Annual Review of Nuclear and Particle Science, 1987 A review of perturbative QCD results, particularly factorization theorems, from the literature ''for which there is a statement of the result at all orders of perturbation theory and a reasonable approximation to a proof'' is presented. (AIP)
J C Collins, D E Soper
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Perturbations and Weyl’s theorem [PDF]
Proceedings of the American Mathematical Society, 2007 A Banach space operator T T is completely hereditarily normaloid,
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An Interpolation Theorem with Perturbed Continuity
Journal of Functional Analysis, 2002 Let \((A_0,A_1)\) and \((B_0,B_1)\) be two interpolation couples and let \(T: (A_0, A_1)\to (B_0, B_1)\) be a \(K\)-quasilinear operator. The boundedness of the operator from \(A_0\) to \(B_0\) implies \(K(t, Ta;B_0,B_1)\leq M_0\|a\|_{A_0}\) and the boundedness of the operator from \(A_1\) to \(B_1\) implies \(K(t,Ta; B_1,B_0)\leq M_1\|a\|_{A_1}\), \(a\
Sagher, Y., Shvartsman, P.
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Majorization, 4G Theorem and Schrödinger perturbations [PDF]
Journal of Evolution Equations, 2015 Schrödinger perturbations of transition densities by singular potentials may fail to be comparable with the original transition density. For instance this is so for the transition density of a subordinator perturbed by any time-independent unbounded potential.
Bogdan, Krzysztof +2 more
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Existence of Generalized Homoclinic Solutions of Lotka-Volterra System under a Small Perturbation
Journal of Function Spaces, 2016 This paper investigates Lotka-Volterra system under a small perturbation vxx=-μ(1-a2u-v)v+ϵf(ϵ,v,vx,u,ux), uxx=-(1-u-a1v)u+ϵg(ϵ,v,vx,u,ux). By the Fourier series expansion technique method, the fixed point theorem, the perturbation theorem, and the ...
Yuzhen Mi
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Markovian perturbation, response and fluctuation dissipation theorem [PDF]
, 2010 We consider the Fluctuation Dissipation Theorem (FDT) of statistical physics from a mathematical perspective. We formalize the concept of "linear response function" in the general framework of Markov processes.
Dembo, Amir, Deuschel, Jean-Dominique
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A Kam Theorem for Space-Multidimensional Hamiltonian PDE [PDF]
, 2016 We present an abstract KAM theorem, adapted to space-multidimensional hamiltonian PDEs with smoothing non-linearities. The main novelties of this theorem are that: $\bullet$ the integrable part of the hamiltonian may contain a hyperbolic part and as a ...
Eliasson, L Hakan +2 more
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