3,388 research outputs found
Deflected Anomaly Mediation and Neutralino Dark Matter
We study the phenomenology of the neutralino dark matter in the so called
deflected anomaly mediation scenario. This scheme is obtained from the minimal
anomaly mediated scenario by introducing a gauge mediated sector with
messenger fields. Unlike the former scheme the latter has no tachyons. We find
that the neutralino is still the LSP in a wide region of the parameter space:
it is essentially a pure bino in the scenario with while it can also be
a pure higgsino for . This is very different from the naive anomaly
mediated scenario which predicts a wino like neutralino. Moreover we do not
find any tachyonic scalars in this scheme. After computing the relic density
(considering all the possible coannihilations) we find that there are regions
in the parameter space with values compatible with the latest WMAP results with
no need to consider moduli fields that decay in the early universe.Comment: 23 pages, 6 figures, submitted to Phys. Rev.
Confidence Interval Estimation Tasks and the Economics of Overconfidence
Experiments in psychology, where subjects estimate confidence intervals to a series of factual questions, have shown that individuals report far too narrow intervals. This has been interpreted as evidence of overconfidence in the preciseness of knowledge, a potentially serious violation of the rationality assumption in economics. Following these results a growing literature in economics has incorporated overconfidence in models of, for instance, financial markets. In this paper we investigate the robustness of results from confidence interval estimation tasks with respect to a number of manipulations: frequency assessments, peer frequency assessments, iteration, and monetary incentives. Our results suggest that a large share of the overconfidence in interval estimation tasks is an artifact of the response format. Using frequencies and monetary incentives reduces the measured overconfidence in the confidence interval method by about 65%. The results are consistent with the notion that subjects have a deep aversion to setting broad confidence intervals, a reluctance that we attribute to a socially rational trade-off between informativeness and accuracy.overconfidence; uncertainty; monetary incentives; experiments
Safe Concurrency Introduction through Slicing
Traditional refactoring is about modifying the structure of existing code without changing its behaviour, but with the aim of making code easier to understand, modify, or reuse. In this paper, we introduce three novel refactorings for retrofitting concurrency to Erlang applications, and demonstrate how the use of program slicing makes the automation of these refactorings possible
Recommended from our members
Semantic and inferencing abilities in children with communication disorders
Background: Semantic and inferencing abilities have not been fully examined in children with communication difficulties.
Aims: To investigate the inferential and semantic abilities of children with communication difficulties using newly designed tasks.
Methods & Procedures: Children with different types of communication disorder were compared with each other and with three groups of typically developing children: those of the same chronological age and two groups of younger children. In total, 25 children aged 11 years with specific language impairment and 22 children, also 11 years of age, with primary pragmatic difficulties were recruited. Typically developing groups aged 11 (n = 35; age‐match), and those aged 9 (n = 40) and 7 (n = 37; language similar) also participated as comparisons.
Outcomes & Results: For Semantic Choices, children with specific language impairment performed significantly more poorly than 9‐ and 11‐year‐olds, whilst the pragmatic difficulties group scored significantly lower than all the typically developing groups. Borderline differences between specific language impairment and pragmatic difficulties groups were found. For inferencing, children with communication impairments performed significantly below the 11‐year‐old peers, but not poorer than 9‐ and 7‐year‐olds, suggesting that this skill is in line with language ability. Six children in the pragmatic difficulties group who met diagnosis for autism performed more poorly than the other two clinical groups on both tasks, but not statistically significantly so.
Conclusions: Both tasks were more difficult for those with communication impairments compared with peers. Semantic but not inferencing abilities showed a non‐significant trend for differences between the two clinical groups and children with pragmatic difficulties performed more poorly than all typically developing groups. The tasks may relate to each other in varying ways according to type of communication difficulty
Dark Matter Searche with GLAST
The Gamma-Ray Large Area Space Telescope (GLAST), scheduled to be launched in
fall 2007, is the next generation satellite for high-energy gamma-ray
astronomy. The Large Area Telescope (LAT),
GLAST main instrument, with a wide field of view (> 2 sr), a large effective
area (> 8000 cm^2 at 1 GeV) and 20 MeV - 300 GeV energy range, will provide
excellent high energy gamma-ray observations for Dark Matter searches. In this
paper we examine the potential of the LAT to detect gamma-rays coming from
WIMPS annihilation in the context of supersymmetry. As an example, two search
regions are investigated: the galactic center and the galactic satellites.Comment: Comment: 6 pages, 3 figures, 36th COSPAR proceeding accepted for
publication in "Advances in Space Research
e-EVN monitoring of M87
M87 is a privileged laboratory for a detailed study of the properties of jets, owing to its proximity (D=16.7 Mpc, 1 mas = 0.080 pc), its massive black hole (~6.0 x 10^9M) and its conspicuous emission at radio wavelengths and above. We started on November 2009 a monitoring program with the e-EVN at 5 GHz, in correspondence of the season of Very High Energy (VHE) observations. Indeed, two episodes of VHE activity have been reported in February and April 2010. We present here the main results of these multi-epoch observations: the inner jet and HST-1 are both detected and resolved in our datasets. We study the apparent velocity of HST-1, which seems to be increasing since 2005, and the flux density variability in the inner jet. All in all, the radio counterpart to this year’s VHE event seems to be different from the ones in 2005 and 2008, opening new scenario for the radio-high energy connection
Billiards and Brains: Cognitive Ability and Behavior in a p-Beauty Contest
"Beauty contests" are well-studied, dominance-solvable games that generate two interesting results. First, most behavior does not conform to the unique Nash equilibrium. Second, there is considerable unexplained heterogeneity in behavior. In this work, we evaluate the relationship between beauty contest behavior and cognitive ability. We find that subjects with high cognitive ability exhibit behavior that is closer to the Nash equlibrium. We examine this finding through the prism of economic and biological theory.beauty contest; rationality; cognitive ability; Nash equlibrium
Settelments, economy and mobility in the Ecrins massif during the Middle Ages: first results of a doctoral research
International audienceThis poster deals with the doctoral research of Roxanne Cesarini (PhD student, Aix Marseille Univ, CNRS, LA3M, Aix-en-Provence, France). This research is about the occupation of mountains and more precisely on settlements, mobility and economic activities in the French Southern Alps. Its aim is to shed light on the socio-economic mechanims of medieval populations in mountains and to offer a synthesis on the evolution of the medieval landscape based mainly on the archaeological and historical data which are collected
- …