Results 21 to 30 of about 129,686 (122)
Ostrogradski approach for the Regge-Teitelboim type cosmology [PDF]
, 2009 We present an alternative geometric inspired derivation of the quantum cosmology arising from a brane universe in the context of {\it geodetic gravity}.
Alberto Molgado +8 more
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Ray and heteroclinic solutions of Hamiltonian systems with 2 degrees of freedom
Discrete & Continuous Dynamical Systems - A, 2013 In this paper, we study a class of Hamiltonian system with 2 degrees of freedom. We show that at any energy level above a certain critical value of each system, there are ray and heteroclinic solutions between any two periodic neighboring minimal solutions with any prescribed non-trivial homotopy class.
openaire +1 more source
Arnold diffusion for an a priori unstable Hamiltonian system with 3 + 1/2 degrees of freedom
Chaos: An Interdisciplinary Journal of Nonlinear ScienceIn the present paper, we apply the geometrical mechanism of diffusion in an a priori unstable Hamiltonian system [L. Chierchia and G. Gallavotti, Ann. l’I.H.P. Phys. théor. 60, 1–144 (1994)] with 3 + 1/2 degrees of freedom. This mechanism consists of combining iterations of the inner and outer dynamics associated with a Normally Hyperbolic Invariant ...
A. Delshams, A. Granados, R. G. Schaefer
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Relaxation to a Perpetually Pulsating Equilibrium
, 2004 Paper in honour of Freeman Dyson on the occasion of his 80th birthday. Normal N-body systems relax to equilibrium distributions in which classical kinetic energy components are 1/2 kT, but, when inter-particle forces are an inverse cubic repulsion ...
Lynden-Bell, D., Lynden-Bell, R. M.
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Unconstrained Hamiltonian formulation of low energy QCD
EPJ Web of Conferences, 2014 Using a generalized polar decomposition of the gauge fields into gaugerotation and gauge-invariant parts, which Abelianises the Non-Abelian Gauss-law constraints to be implemented, a Hamiltonian formulation of QCD in terms of gauge invariant dynamical ...
Pavel Hans-Peter
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Numerical Study of Quantum Resonances in Chaotic Scattering
, 2001 This paper presents numerical evidence that for quantum systems with chaotic classical dynamics, the number of scattering resonances near an energy $E$ scales like $\hbar^{-\frac{D(K_E)+1}{2}}$ as $\hbar\to{0}$.
Aguilar +35 more
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Analytic estimation of Lyapunov exponent in a mean-field model undergoing a phase transition
, 1998 The parametric instability contribution to the largest Lyapunov exponent (LLE) is derived for a mean-field Hamiltonian model, with attractive long-range interactions.
Firpo, M. C.
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Hierarchical mean-field approach to the $J_1$-$J_2$ Heisenberg model on a square lattice [PDF]
, 2009 We study the quantum phase diagram and excitation spectrum of the frustrated $J_1$-$J_2$ spin-1/2 Heisenberg Hamiltonian. A hierarchical mean-field approach, at the heart of which lies the idea of identifying {\it relevant} degrees of freedom, is ...
A. Auerbach +8 more
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(Vanishing) Twist in the Saddle-Centre and Period-Doubling Bifurcation [PDF]
, 2003 The lowest order resonant bifurcations of a periodic orbit of a Hamiltonian system with two degrees of freedom have frequency ratio 1:1 (saddle-centre) and 1:2 (period-doubling).
Dullin, Holger R., Ivanov, Alexey V.
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AdS N-body problem at large spin
Journal of High Energy PhysicsMotivated by the problem of multi-twist operators in general CFTs, we study the leading-twist states of the N-body problem in AdS at large spin J. We find that for the majority of states the effective quantum-mechanical problem becomes semiclassical with
Petr Kravchuk, Jeremy A. Mann
doaj +1 more source