14,746 research outputs found
Multidimensional perfectionism and narcissism: Grandiose or vulnerable?
Multidimensional perfectionism is related to grandiose narcissism, with other-oriented perfectionism showing the strongest, most consistent relationships. The relationships with vulnerable narcissism, however, are unclear. Our study investigated how three forms of perfectionism--self-oriented, other-oriented, and socially prescribed perfectionism (Hewitt & Flett, 1991)--are related to narcissistic grandiosity and vulnerability. A sample of 375 university students completed the Narcissistic Personality Inventory (Raskin & Terry, 1988), Hypersensitive Narcissism Scale (Hendin & Cheek, 1997), and Pathological Narcissism Inventory (Pincus et al., 2009) capturing various facets of narcissistic grandiosity and vulnerability. Multiple regressions were conducted controlling for the overlap between the three forms of perfectionism and gender. Other-oriented perfectionism showed unique positive relationships with key facets of grandiose narcissism. In contrast, socially prescribed perfectionism showed positive relationships with all facets of vulnerable narcissism. Self- and other-oriented perfectionism showed positive relationships with individual facets only. Other-oriented perfectionism appears to represent a form of perfectionism predominantly related to narcissistic grandiosity, whereas socially prescribed perfectionism is predominantly related to narcissistic vulnerability. As the first study to examine perfectionism in relation to narcissistic grandiosity and vulnerability, our research both extends and clarifies the nomological network of the perfectionism construct in important ways
BCS - BEC crossover at T=0: A Dynamical Mean Field Theory Approach
We study the T=0 crossover from the BCS superconductivity to Bose-Einstein
condensation in the attractive Hubbard Model within dynamical mean field
theory(DMFT) in order to examine the validity of Hartree-Fock-Bogoliubov (HFB)
mean field theory, usually used to describe this crossover, and to explore
physics beyond it. Quantum fluctuations are incorporated using iterated
perturbation theory as the DMFT impurity solver. We find that these
fluctuations lead to large quantitative effects in the intermediate coupling
regime leading to a reduction of both the superconducting order parameter and
the energy gap relative to the HFB results. A qualitative change is found in
the single-electron spectral function, which now shows incoherent spectral
weight for energies larger than three times the gap, in addition to the usual
Bogoliubov quasiparticle peaks.Comment: 11 pages,12 figures, Published versio
Magnetic field effects in few-level quantum dots: theory, and application to experiment
We examine several effects of an applied magnetic field on Anderson-type
models for both single- and two-level quantum dots, and make direct comparison
between numerical renormalization group (NRG) calculations and recent
conductance measurements. On the theoretical side the focus is on
magnetization, single-particle dynamics and zero-bias conductance, with
emphasis on the universality arising in strongly correlated regimes; including
a method to obtain the scaling behavior of field-induced Kondo resonance shifts
over a very wide field range. NRG is also used to interpret recent experiments
on spin-1/2 and spin-1 quantum dots in a magnetic field, which we argue do not
wholly probe universal regimes of behavior; and the calculations are shown to
yield good qualitative agreement with essentially all features seen in
experiment. The results capture in particular the observed field-dependence of
the Kondo conductance peak in a spin-1/2 dot, with quantitative deviations from
experiment occurring at fields in excess of 5 T, indicating the eventual
inadequacy of using the equilibrium single-particle spectrum to calculate the
conductance at finite bias.Comment: 15 pages, 12 figures. Version as published in PR
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