منابع مشابه
Nonequilibrium Quantum Fields and the Classical Field Theory Limit
We calculate the far-from-equilibrium dynamics and thermalization both for the quantum and the classical O(N)–model. The early and late-time behavior can be described from the 2PI–loop expansion for weak couplings or the nonperturbative 2PI–1/N expansion of the effective action beyond leading order. A comparison with exact simulations in 1+1 dimensions in the classical limit shows that the 2PI–...
متن کاملClassical Limit of Quantum Mechanics
para o valor esperado de uma dada observável fı́sica A = A(p, q, t) representada pelo operador Â. As equações (1) e (2) são válidas desde que o potencial externo V varie vagarosamente dentro de um pacote de onda bem localizadoψPE (Pacote de Ehrenfest). Assim, de acordo com os livros-texto [1], as equações de Newton são obtidas como limite clássico da equação de Schrödinger. No entanto, Ballentin...
متن کاملQuantum-classical limit of quantum correlation functions.
A quantum-classical limit of the canonical equilibrium time correlation function for a quantum system is derived. The quantum-classical limit for the dynamics is obtained for quantum systems comprising a subsystem of light particles in a bath of heavy quantum particles. In this limit the time evolution of operators is determined by a quantum-classical Liouville operator, but the full equilibriu...
متن کاملThe Classical Limit of Quantum Partition Functions
We extend Lieb's limit theorem [which asserts that SO(3) quantum spins approach S classical spins as L-> oo] to general compact Lie groups. We also discuss the classical limit for various continuum systems. To control the compact group case, we discuss coherent states built up from a maximal weight vector in an irreducible representation and we prove that every bounded operator is an integral o...
متن کاملThe classical - statistical limit of quantum mechanics
The classical-statistical limit of quantum mechanics is studied. It is proved that the limit ~ → 0 is the good limit for the operators algebra but it si not so for the state compact set. In the last case decoherence must be invoked to obtain the classical-statistical limit.
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ژورنال
عنوان ژورنال: Synthese
سال: 1982
ISSN: 0039-7857,1573-0964
DOI: 10.1007/bf00416901