Synchrotron and Synchrotron Self-Compton Spectral Signatures and Blazar Emission Models

We find that energy losses due to synchrotron self-Compton (SSC) emission in blazar jets can produce distinctive signatures in the time-averaged synchrotron and SSC spectra of these objects. For a fairly broad range of particle injection distributions, SSC-loss dominated synchrotron emission exhibits a spectral dependence $F_\nu \sim \nu^{-3/2}$. The presence or absence of this dependence in the optical and ultraviolet spectra of flat spectrum radio quasars such as 3C~279 and in the soft X-ray spectra of high frequency BL Lac objects such as Mrk 501 gives a robust measure of the importance of SSC losses. Furthermore, for partially cooled particle distributions, spectral breaks of varying sizes can appear in the synchrotron and SSC spectra and will be related to the spectral indices of the emission below the break. These spectral signatures place constraints on the size scale and the non-thermal particle content of the emitting plasma as well as the observer orientation relative to the jet axis.Comment: 4 pages, 1 figure, LaTeX2e, emulateapj5.sty, accepted for publication in Ap

When Envy Breeds Desire: Consequences of Uncontrolled Comparisons with Better-Off Others

Envy is an unpleasant emotion that results from a negative social comparison, such as when people become aware of someone possessing a superior good. A central component of envy seems to be the desire for this superior fortune. Despite its important implications, empirical evidence on the psychological underpinnings of envious desire is lacking. Assuming that people are motivated to control their spontaneous envious reactions, I predict that envy and envious desire are strongest when resources to exert self-control are taxed. To evoke envy, participants were invited to a taste test. Some of them completed this taste test in the presence of other persons who were asked to taste a more attractive food. In Experiment 1, participants, who were in the presence of a more fortunate person assigned to taste chocolate, were more dissatisfied, angrier, and more envious the more intoxicated they were. This did not happen when they were asked to taste their less attractive chewy candy alone. In Experiment 2, participants envied their experimental partner, who was assigned to taste an attractive ice cream instead of the inferior biscuit assigned to them, most intensely under high cognitive load. Furthermore, they reported a higher willingness to pay for the ice cream than participants in any other condition. In Experiment 3, participants in an envy evoking experimental condition were most likely to spontaneously purchase the better product under high cognitive load. In Experiment 4, automatic approach behavior towards the more attractive food of the neighboring participant was increased under high cognitive load. The findings shed light on the determinants and the consequences of envy on economic judgments and decisions

American marketing methods in Argentina

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Ensuring confidence in radionuclide-based sediment chronologies and bioturbation rates

Author Posting. © The Author(s), 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Estuarine, Coastal and Shelf Science 71 (2007): 537-544, doi:10.1016/j.ecss.2006.09.006.Sedimentary records of naturally occurring and fallout-derived radionuclides are widely used as tools for estimating both the ages of recent sediments and rates of sedimentation and bioturbation. Developing these records to the point of data interpretation requires careful sample collection, processing, analysis and data modeling. In this work, we document a number of potential pitfalls that can impact sediment core records and their interpretation. This paper is not intended as an exhaustive treatment of these potential problems. Rather, the emphasis is on potential problems that are not well documented in the literature, as follows: 1) The mere sampling of sediment cores at a resolution that is too coarse can result in an apparent diffusive mixing of the sedimentary record at rates comparable to diffusive bioturbation rates observed in many locations; 2) 210Pb profiles in slowly accumulating sediments can easily be misinterpreted to be driven by sedimentation, when in fact bioturbation is the dominant control. Multiple isotopes of different half lives and/or origin may help to distinguish between these two possible interpretations; 3) Apparent mixing can occur due simply to numerical artifacts inherent in the finite difference approximations of the advection diffusion equation used to model sedimentation and bioturbation. Model users need to be aware of this potential problem. Solutions to each of these potential pitfalls are offered to ensure the best possible sediment age estimates and/or sedimentation and bioturbation rates can be obtained.Thanks to the U.S. Geological Survey Coastal and Marine Geology Program, the Andrew F. Mellon Foundation, the Earth Institute Postdoctoral Fellowship Program at Columbia University, and the National Science Foundation for funding

Angular, spectral, and time distributions of highest energy protons and associated secondary gamma-rays and neutrinos propagating through extragalactic magnetic and radiation fields

The angular, spectral and temporal features of the highest energy protons and accompanying them secondary neutrinos and synchrotron gamma-rays propagating through the intergalactic magnetic and radiation fields are studied using the analytical solutions of the Boltzmann transport equation obtained in the limit of the small-angle and continuous-energy-loss approximation.Comment: 21 pages, 13 figure

How Inheritances Affect Retirement Plannings

This study uses the German SAVE panel study in order to estimate the effect of intergenerational transfers on the expected retirement entry age of individuals. The literature in this field typically estimates the transfer effect on the actual retirement probability. We suggest to base the analysis on the expected retirement age instead. This entails two methodological advantages: First, it is possible to exploit the within individual variation for the entire sample (even of those who do not retire) and thereby permits to analyze the life-cycle considerations of younger age groups. Second, the effect size can easily be expressed in terms of time and thereby monetary opportunity costs. We find that heirs expect to retire earlier, even when receipts are expected to some degree. Specifically, heirs plan to retire four to five months earlier and thereby accept costs in the form of foregone income and pension entitlements corresponding to 20-30% of the inheritance