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Sökning: WFRF:(Karabulut G.) > (2015)

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1.
  • Akay, Alpaslan, 1975, et al. (författare)
  • Cooperation and punishment: The effect of religiosity and religious festival
  • 2015
  • Ingår i: Economics Letters. - : Elsevier BV. - 0165-1765. ; 130, s. 43-46
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper examines how a religious festival (Ramadan) and the degree of religiosity affect cooperation and costly punishment in a public goods experiment. We find significantly higher cooperation levels outside the festival among less religious people. This behavior is consistent with a substitution effect between religious and non-religious activities. © 2015 Elsevier B.V.
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2.
  • Cremon, Jonas, et al. (författare)
  • Rotating Bose-Einstein condensates: Closing the gap between exact and mean-field solutions
  • 2015
  • Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 91:3
  • Tidskriftsartikel (refereegranskat)abstract
    • When a Bose-Einstein-condensed cloud of atoms is given some angular momentum, it forms vortices arranged in structures with a discrete rotational symmetry. For these vortex states, the Hilbert space of the exact solution separates into a "primary" space related to the mean-field Gross-Pitaevskii solution and a "complementary" space including the corrections beyond mean field. Considering a weakly interacting Bose-Einstein condensate of harmonically trapped atoms, we demonstrate how this separation can be used to close the conceptual gap between exact solutions for systems with only a few atoms and the thermodynamic limit for which the mean field is the correct leading-order approximation. Although we illustrate this approach for the case of weak interactions, it is expected to be more generally valid.
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