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  • 1
    Electronic Resource
    Electronic Resource
    The quantum structure of spacetime at the Planck scale and quantum fields (1995)
    Springer
    Communications in mathematical physics 172 (1995), S. 187-220 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We propose uncertainty relations for the different coordinates of spacetime events, motivated by Heisenberg's principle and by Einstein's theory of classical gravity. A model of Quantum Spacetime is then discussed where the commutation relations exactly implement our uncertainty relations. We outline the definition of free fields and interactions over QST and take the first steps to adapting the usual perturbation theory. The quantum nature of the underlying spacetime replaces a local interaction by a specific nonlocal effective interaction in the ordinary Minkowski space. A detailed study of interacting QFT and of the smoothing of ultraviolet divergences is deferred to a subsequent paper. In the classical limit where the Planck length goes to zero, our Quantum Spacetime reduces to the ordinary Minkowski space times a two component space whose components are homeomorphic to the tangent bundleTS 2 of the 2-sphere. The relations with Conne's theory of the standard model will be studied elsewhere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104515
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Labile Self-Esteem, Life Stress, and Depressive Symptoms: Prospective Data Testing A Model of Vulnerability (1997)
    Springer
    Cognitive therapy and research 21 (1997), S. 569-589 
    Details
    ISSN: 1573-2819
    Keywords: self-esteem ; life stress ; depression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract Recent theory and research suggests that labile self-esteem (SE) is an important dimension of vulnerability to depression (Butler, Hokanson, & Flynn, 1994; Roberts & Monroe, 1992, 1994, in press). In the present study, participants completed seven daily ratings of SE from which we derived a measure of lability. The interaction between labile SE and life stress predicted increases in depressive symptoms across a two-month prospective interval, particularly in participants who were initially low in depression and who had more severe worst lifetime episodes of depressive symptomatology. Interactions between life stress and labile SE were stronger for life stress measures that were based on the subjective appraisal of stress than for those that were based on raw life event counts. In contrast to predictions, depletions in self-esteem failed to mediate the synergistic effects of labile SE and life stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021861503072
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Neuroticism and Ruminative Response Style as Predictors of Change in Depressive Symptomatology (1998)
    Springer
    Cognitive therapy and research 22 (1998), S. 445-455 
    Details
    ISSN: 1573-2819
    Keywords: RUMINATION ; NEUROTICISM ; DEPRESSION ; RESPONSE STYLES ; DEPRESSIVE SYMPTOMS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract Several investigations have demonstrated thatneuroticism and ruminative response style are associatedwith increased risk for depression. The current studyexamined the effects of neuroticism and ruminative response style on changes in depressivesymptoms over an 8- to 10-week interval. Analysesindicated that the effects of neuroticism and ruminativeresponse style were moderated by initial level ofdepressive symptomatology. Specifically, neuroticism andruminative response style predicted changes indepressive symptoms more strongly in individuals whowere initially higher in levels of depression than they did in those with lower initial levels ofdepressive symptoms. These data were consistent with apath model in which ruminative response style mediatedthe effect of neuroticism on depression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018769531641
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ruminative Response Style and Vulnerability to Episodes of Dysphoria: Gender, Neuroticism, and Episode Duration (1998)
    Springer
    Cognitive therapy and research 22 (1998), S. 401-423 
    Details
    ISSN: 1573-2819
    Keywords: DYSPHORIA ; RUMINATIVE RESPONSE STYLE ; NEUROTICISM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract A number of recent laboratory and prospectivefield studies suggest that the tendency to ruminateabout dysphoric moods is associated with more severe andpersistent negative emotional experiences (e.g., Morrow & Nolen-Hoeksema, 1990;Nolen-Hoeksema & Morrow, 1991). The current paperreports two studies that tested the hypotheses that (a)ruminative response styles act as a trait vulnerabilityto dysphoria, particularly to relativelypersistent episodes of dysphoria; (b) aspects ofrumination that are not likely to be contaminated withthe presence and severity of previous symptomatology(introspection/self-isolation, self-blame) demonstrate vulnerability effects;and (c) rumination mediates the effects of gender andneuroticism on vulnerability to dysphoria. Consistentsupport was found for each of these hypotheses. Overall, our data suggest that rumination mightreflect an important cognitive manifestation ofneuroticism that increases vulnerability to episodes ofpersistent dysphoria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018713313894
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Differentiating Symptoms of Anxiety and Depression in Older Adults: Distinct Cognitive and Affective Profiles? (1999)
    Springer
    Cognitive therapy and research 23 (1999), S. 53-74 
    Details
    ISSN: 1573-2819
    Keywords: ANXIETY ; OLDER ADULTS ; COGNITION ; DEPRESSION ; AFFECT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract Cognitive and affective dimensions of symptomsof anxiety and depression were examined in a sample of283 community-dwelling older adults (ranging in age from65 to 93 years). A principal-axis factor analysis with varimax rotation conducted on theCognition Checklist (CCL) revealed a factor structuredifferent than that found in younger adults. Threefactors emerged (Anxious, Social Loss, and NegativeSelf-Evaluation/Worthlessness Cognitions) and, in general, these cognitionswere not specifically related to anxious and depressivesymptoms. Instead, worthlessness cognitions wererobustly associated with both anxious and depressive symptoms, including variance that was unique toeach. In terms of affective dimensions, factor analysesrevealed that only anxiety-related items loaded on thenegative affectivity subscale. Consequently, negative affectivity was strongly related tovariance that was unique to anxious symptoms, but wasonly weakly related to variance that was unique todepressive symptoms. On the other hand, positiveaffectivity was only weakly associated with both forms ofsymptomatology. Findings are discussed in terms of thecognitive and affective distinctions between older andyounger adulthood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018710707960
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    Paper (German National Licenses)
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