Results 71 to 80 of about 261,560 (199)
Inhomogeneous Neutrino Degeneracy and Big Bang Nucleosynthesis [PDF]
, 1999 We examine Big Bang nucleosynthesis (BBN) in the case of inhomogenous neutrino degeneracy, in the limit where the fluctuations are sufficiently small on large length scales that the present-day element abundances are homogeneous.
A. Casas +20 more
core +2 more sources
Integrability of natural Hamiltonian systems with homogeneous potentials of degree zero
, 2009 We derive necessary conditions for integrability in the Liouville sense of natural Hamiltonian systems with homogeneous potential of degree zero. We derive these conditions through an analysis of the differential Galois group of variational equations ...
Andrzej J. Maciejewski +21 more
core +3 more sources
Straight Line Orbits in Hamiltonian Flows
, 2009 We investigate periodic straight-line orbits (SLO) in Hamiltonian force fields using both direct and inverse methods. A general theorem is proven for natural Hamiltonians quadratic in the momenta in arbitrary dimension and specialized to two and three ...
A. Chenciner +16 more
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HOMOGENIZATION OF THE SCHRÖDINGER EQUATION WITH LARGE, RANDOM POTENTIAL
Stochastics and Dynamics, 2013 We study the behavior of solutions to a Schrödinger equation with large, rapidly oscillating, mean zero, random potential with Gaussian distribution. We show that in high dimension d > 𝔪, where 𝔪 is the order of the spatial pseudo-differential operator in the Schrödinger equation (with 𝔪 = 2 for the standard Laplace operator), the solution ...
Zhang, Ningyao, Bal, Guillaume
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Homogeneous Cooling with Repulsive and Attractive Long-Range Potentials [PDF]
Mathematical Modelling of Natural Phenomena, 2011 Summary: The interplay between dissipation and long-range repulsive/attractive forces in homogeneous, dilute, mono-disperse particle systems is studied. The \textit{pseudo-Liouville} operator formalism, originally introduced for hard-sphere interactions, is modified such that it provides very good predictions for systems with weak long-range forces at ...
Müller, M.K, Luding, S.
openaire +3 more sources
Transfer Printed Nanomembranes for Heterogeneously Integrated Membrane Photonics
Photonics, 2015 Heterogeneous crystalline semiconductor nanomembrane (NM) integration is investigated for single-layer and double-layer Silicon (Si) NM photonics, III-V/Si NM lasers, and graphene/Si NM total absorption devices.
Hongjun Yang +6 more
doaj +1 more source
Physical Review Research, 2019 We address the interplay of electron-electron (e-e) and electron-phonon (e-ph) interactions in the Hubbard-Holstein model, using a two-component density functional theory.
E. Viñas Boström +3 more
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Karpatsʹkì Matematičnì Publìkacìï, 2019 In weighted Hölder spaces it is studied the smoothness of integrals, which have the structure and properties of derivatives of volume potentials which generated by fundamental solutions of the Cauchy problem for one ultraparabolic arbitrary order ...
V.S. Dron' +2 more
doaj +1 more source
Exponential convergence to equilibrium for the homogeneous Landau equation with hard potentials
, 2014 This paper deals with the long time behaviour of solutions to the spatially homogeneous Landau equation with hard potentials . We prove an exponential in time convergence towards the equilibrium with the optimal rate given by the spectral gap of the ...
Carrapatoso, Kleber
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Planar N-body central configurations with a homogeneous potential [PDF]
Celestial Mechanics and Dynamical Astronomy, 2019 Central configurations give rise to self-similar solutions to the Newtonian $N$-body problem, and play important roles in understanding its complicated dynamics. Even the simple question of whether or not there are finitely many planar central configurations for $N$ positive masses remains unsolved in most cases.
openaire +2 more sources