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    Öğe
    Effective Hamiltonian for non-minimally coupled scalar fields
    (Springer/Plenum Publishers, 2009) Mese, Emine; Pirinccioglu, Nurettin; Acikgoz, Irfan; Binbay, Figen
    In the post Newtonian limit, a non-relativistic Hamiltonian is derived for scalar fields with quartic self-interaction and non-minimal coupling to the curvature scalar of the background spacetime. These effects are found to contribute to the non-relativistic Hamiltonian by adding nonlinearities and by modifying the gravitational Darwin term. As we discuss briefly in the text, the impact of these novel structures can be sizable in dense media like neutron star core, and can have observable signatures in phase transitions, for example.
  • [ X ]
    Öğe
    Non-Markovian decoherence: A critique of the two-level approximation
    (Elsevier Science Bv, 2006) Hakioglu, T.; Savran, Kerim; Sevincli, Haldun; Mese, Emine
    The environmental decoherence in multilevelled systems in the context of two-level approximation is examined. It is found that the environmental temperature plays a minor role in the magnitudes of the decoherence rates whereas, the system-environment coupling and the environmental energy spectrum are dominant. Particularly, the latter is important in zero temperature quantum fluctuations and/or the nonequilibrium noise sources due to the large range of energies present in the environmental modes. Decoherence is found to be dominated by the short time nonresonant processes and this observation severely questions the use of the two-levelled models on decoherence. (C) 2005 Elsevier B.V. All rights reserved.