7,677 research outputs found
Local Cohomology and non commutative Gorenstein algebras
In this paper we continue the study of non connected graded Gorenstein
algebras initiated in a previous paper, the main result is the proof of a
version of the Local Cohomology formula
Top and bottom tensor couplings from a color octet scalar
We compute the one-loop contributions from a color octet scalar to the tensor
anomalous couplings of top and bottom quarks to gluons, photons and W bosons.
We use known constraints on the parameters of the model to compare the
predicted size of these couplings with existing phenomenological constraints.Comment: References added, matches accepted version for publicatio
Adopt a hypothetical pup: A count data approach to the valuation of wildlife.
The willingness to pay for a coyote conservation program is estimated using a novel payment-vehicle, based on how many coyotes respondents would be willing to sponsor. This hypothetical scenario mimics an increasingly popular type of actual market. Data from a phone survey conducted in Prince Edward Island are analyzed using count data models that consider different processes explaining zero responses and the level of positive responses. This is particularly important in the case of coyotes, often regarded as a bad. Estimates of willingness to pay per coyote around 20 and annual consumer surplus per respondent of about 42 are obtained.coyotes, wildlife, contingent valuation, count data, zero- inflation
An Estimation of Residential Water Demand Using Co-Integration and Error Correction Techniques
In this paper short- and long-run price elasticities of residential water demand are estimated using co-integration and error-correction methods. Unit root tests reveal that water use series and series of other variables affecting use are non-stationary. However, a long-run co-integrating relationship is found in the water demand model, which makes it possible to obtain a partial correction term and to estimate an error correction model. The empirical application uses monthly time-series observations from Seville (Spain). The price-elasticity of demand is estimated as around -0.1 in the short run and -0.5 in the long run. These results are robust to the use of different specifications.seasonal unit roots; residential water demand; price elasticity; time-series; co-integration; Error Correction Model
A Box-Cox double-hurdle model of wildlife valuation: the citizen’s perspective.
A stated-preference approach is used to elicit the attitudes of the general public towards coyotes conservation. The payment vehicle is presented in a way that explicitly prompts individuals to adopt a citizen perspective, rather than a consumer perspective, when responding to the survey. To deal with the large numbers of zero responses, a Box- Cox Double Hurdle specification is used to model separately individuals’ choices about whether to support conservation or not and their choice about the degree of support. The results show that simpler analyses that do not account explicitly for this two different decisions would lead to misleading conclusions in the study of nuisance wildlife. The study uses a survey conducted in Prince Edward Island (Canada).Coyotes; wildlife valuation, citizen versus consumer preferences; paymentvehicle; Box-Cox, double hurdle time-series, co- integration, Error Correction Model.
Skew group algebras, invariants and Weyl Algebras
The aim of this paper is two fold:
First to study finite groups of automorphisms of the homogenized Weyl
algebra , the skew group algebra , the ring of invariants
, and the relations of these algebras with the Weyl algebra ,
with the skew group algebra , and with the ring of invariants
. Of particular interest is the case .
In the on the other hand, we consider the invariant ring \QTR{sl}{C}[X]^{G}
of the polynomial ring in generators, where is a finite subgroup
of Gl(n,\QTR{sl}{C}) such that any element in different from the identity
does not have one as an eigenvalue. We study the relations between the category
of finitely generated modules over \QTR{sl}{C}[X]^{G} and the corresponding
category over the skew group algebra \QTR{sl}{C}% [X]\ast G. We obtain a
generalization of known results for and a finite subgroup of
. In the last part of the paper we extend the results for the
polynomial algebra to the homogenized Weyl algebra
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