Unveiling the dynamic complexity of rebound effects in sustainability transitions:Towards a system's perspective

Rebound effects (RE) are systemic responses to sustainability-oriented actions that have relentlessly offset the anticipated effects, hindering sustainability transitions. Limitations to account for feedback, delays, and non-linearities hinder a deep understanding of RE, leading to divergent magnitude estimates and management recommendations. Therefore, a better understanding of the dynamic complexity surrounding RE occurrence is needed. Dynamic complexity manifests from the feedback relationships between system elements and how they change over time. This work aims to enhance the understanding of RE's causal and dynamic traits, following system dynamics (SD) as the investigation frame. Based on a literature review, 24 RE-specific dynamic complexities were identified and further categorised following the Iceberg model, which deepens into the causes of RE occurrence, providing additional leverage to prevent or mitigate them. The RE-specific dynamic complexities are then explored in case studies investigating RE through SD, which sustains three propositions for moving forward in RE investigations. This work sets the foundation for enabling less deterministic examinations of RE, capable of reaching recommendations that consider the true nature of the phenomenon

Lexical access in Portuguese stress

Categorical approaches to lexical stress typically assume that words have either regular or irregular stress, and imply that only the latter needs to be stored in the lexicon, while the former can be derived by rule. In this paper, we compare these two groups of words in a lexical decision task in Portuguese to examine whether the dichotomy in question affects lexical retrieval latencies in native speakers, which could indirectly reveal different processing patterns. Our results show no statistically credible effect of stress regularity on reaction times, even when lexical frequency, neighborhood density, and phonotactic probability are taken into consideration. The lack of an effect is consistent with a probabilistic approach to stress, not with a categorical (traditional) approach where syllables are either light or heavy and stress is either regular or irregular. We show that the posterior distribution of credible effect sizes of regularity is almost entirely within the region of practical equivalence, which provides strong evidence that no effect of regularity exists in the lexical decision data modelled. Frequency and phonotactic probability, in contrast, showed statistically credible effects given the experimental data modelled, which is consistent with the literature

Phonological variation and prosodic representation : clitics in Portuguese-Veneto contact

In a variety of Brazilian Portuguese in contact with Veneto, variable vowel reduction in clitic position can be partially accounted for by the phonotactic profile of clitic structures. We show that, when phonotactic profile is controlled for, vowel reduction is statistically more frequent in non-pronominal than in pronominal clitics, which indicates that these clitic types are represented in separate prosodic domains. We propose that this difference in frequency of reduction between clitic types is only possible due to contact with Veneto, which, unlike standard BP, does not exhibit vowel reduction in clitic position. Contact thus provides speakers with the possibility of producing clitic vowels without reduction, and the resulting variation is used to signal prosodic distinctions between clitic types. We show that the difference in frequency of reduction is larger for older speakers, who are more proficient in Veneto and use the language regularly

Gradience in prosodic representation: vowel reduction and neoclassical elements in Brazilian Portuguese

In Brazilian Portuguese, neoclassical elements (NCEs) may combine with both independent lexical words (e.g., psico in psicolinguística ‘psycholinguistics') and nonlexical words (e.g., psico in psicologia ‘psychology'). This has led to the proposal that they have distinct prosodic representations depending on the type of structure that they form: NCE+Indep(endent lexical word) prosodizes recursively in the PWd, whereas NCE+Dep(endent form) prosodizes as a simple PWd. However, both NCE+Indep and NCE+Dep are subject to vowel reduction processes that yield similar surface forms: the NCE in NCE+Indep is targeted by word-final raising, and the NCE in NCE+Dep is targeted by raising in pretonic position. This similarity in surface forms poses a problem for the proposal of separate prosodic representations, as different forms of prosodization imply different phonological behavior. We analyze native speakers' judgements and productions with respect to reduction of the NCE-final vowel under the hypothesis that, if these NCE structures are prosodized differently and undergo different processes, the process that is more frequent in the Brazilian Portuguese grammar (word-final raising) should have higher acceptance and production rates. Results confirm our hypothesis. We argue that the gradient application of phonological processes reflects prosodic distinctions that cannot be captured in a framework that only considers the application or non-application of said processes

Does the galaxy correlation length increase with the sample depth?

We have analyzed the behavior of the correlation length, $r_0$, as a function of the sample depth by extracting from the CfA2 redshift survey volume--limited samples out to increasing distances. For a fractal distribution, the value of $r_0$ would increase with the volume occupied by the sample. We find no linear increase for the CfA2 samples of the sort that would be expected if the Universe preserved its small scale fractal character out to the distances considered (60--100\hmpc). The results instead show a roughly constant value for $r_0$ as a function of the size of the sample, with small fluctuations due to local inhomogeneities and luminosity segregation. Thus the fractal picture can safely be discarded.Comment: Accepted for publication in ApJ

Measuring cosmological bulk flows via the kinematic Sunyaev-Zeldovich effect in the upcoming cosmic microwave background maps

We propose a new method to measure the possible large-scale bulk flows in the Universe from the cosmic microwave background (CMB) maps from the upcoming missions, MAP and Planck. This can be done by studying the statistical properties of the CMB temperature field at many X-ray cluster positions. At each cluster position, the CMB temperature fluctuation will be a combination of the Sunyaev-Zeldovich (SZ) kinematic and thermal components, the cosmological fluctuations and the instrument noise term. When averaged over many such clusters the last three will integrate down, whereas the first one will be dominated by a possible bulk flow component. In particular, we propose to use all-sky X-ray cluster catalogs that should (or could) be available soon from X-ray satellites, and then to evaluate the dipole component of the CMB field at the cluster positions. We show that for the MAP and Planck mission parameters the dominant contributions to the dipole will be from the terms due to the SZ kinematic effect produced by the bulk flow (the signal we seek) and the instrument noise (the noise in our signal). Computing then the expected signal-to-noise ratio for such measurement, we get that at the 95 % confidence level the bulk flows on scales >100h^{-1} Mpc can be probed down to the amplitude of $< 200$ km/sec with the MAP data and down to only 30 km/sec with the Planck mission.Comment: Astrophysical Journal Letters, in pres

Analysis of Round Off Errors with Reversibility Test as a Dynamical Indicator

We compare the divergence of orbits and the reversibility error for discrete time dynamical systems. These two quantities are used to explore the behavior of the global error induced by round off in the computation of orbits. The similarity of results found for any system we have analysed suggests the use of the reversibility error, whose computation is straightforward since it does not require the knowledge of the exact orbit, as a dynamical indicator. The statistics of fluctuations induced by round off for an ensemble of initial conditions has been compared with the results obtained in the case of random perturbations. Significant differences are observed in the case of regular orbits due to the correlations of round off error, whereas the results obtained for the chaotic case are nearly the same. Both the reversibility error and the orbit divergence computed for the same number of iterations on the whole phase space provide an insight on the local dynamical properties with a detail comparable with other dynamical indicators based on variational methods such as the finite time maximum Lyapunov characteristic exponent, the mean exponential growth factor of nearby orbits and the smaller alignment index. For 2D symplectic maps the differentiation between regular and chaotic regions is well full-filled. For 4D symplectic maps the structure of the resonance web as well as the nearby weakly chaotic regions are accurately described.Comment: International Journal of Bifurcation and Chaos, 201