1,676 research outputs found
The Plane-Wave/Super Yang-Mills Duality
We present a self-contained review of the Plane-wave/super-Yang-Mills
duality, which states that strings on a plane-wave background are dual to a
particular large R-charge sector of N=4, D=4 superconformal U(N) gauge theory.
This duality is a specification of the usual AdS/CFT correspondence in the
"Penrose limit''. The Penrose limit of AdS_5 S^5 leads to the maximally
supersymmetric ten dimensional plane-wave (henceforth "the'' plane-wave) and
corresponds to restricting to the large R-charge sector, the BMN sector, of the
dual superconformal field theory. After assembling the necessary background
knowledge, we state the duality and review some of its supporting evidence. We
review the suggestion by 't Hooft that Yang-Mills theories with gauge groups of
large rank might be dual to string theories and the realization of this
conjecture in the form of the AdS/CFT duality. We discuss plane-waves as exact
solutions of supergravity and their appearance as Penrose limits of other
backgrounds, then present an overview of string theory on the plane-wave
background, discussing the symmetries and spectrum. We then make precise the
statement of the proposed duality, classify the BMN operators, and mention some
extensions of the proposal. We move on to study the gauge theory side of the
duality, studying both quantum and non-planar corrections to correlation
functions of BMN operators, and their operator product expansion. The important
issue of operator mixing and the resultant need for re-diagonalization is
stressed. Finally, we study strings on the plane-wave via light-cone string
field theory, and demonstrate agreement on the one-loop correction to the
string mass spectrum and the corresponding quantity in the gauge theory. A new
presentation of the relevant superalgebra is given.Comment: RevTeX 4 format; 91 pages; 7 figures. Prepared for Reviews of Modern
Physics. Please send comments to darius, jabbari @ itp.stanford.edu. v3:
Minor typos fixe
Processor Willingness to Adopt a Crawfish Peeling Machine: An Application of Technology Adoption under Uncertainty
Crawfish processors’ ex ante adoption rates of three hypothetical crawfish peeling machines are assessed using a polychotomous-choice elicitation format. Adoption rates would likely range from 23% to 70%, depending upon which machine was offered and whether it was purchased or leased. Processors most likely to adopt are determined using ordered probit analysis. Likely adopters would be larger, more diversified processors with greater resources and longer planning horizons.crawfish, ex ante technology adoption, peeling machine, Agribusiness, Farm Management, Food Consumption/Nutrition/Food Safety, Industrial Organization, D81, Q16,
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IMPACTS OF INCORPORATING LAND EXCHANGES BETWEEN FORESTRY AND AGRICULTURE IN SECTOR MODELS
The forest and agriculture sectors are linked by having a portion of their land bases suitable for use in either sector. A substantial part of the southern land base is suitable for either forestry or agriculture use, with most of forestation on U.S. agriculture land in the South. We examine how land exchanges between forestry and agriculture are influenced by specific federal conservation and farm support policies, including changes in the Conservation Reserve Program. Reallocation of land is a significant part of the sectors' responses to the policies, along with intensification of timber management on existing southern forests.Agriculture, Conservation, Forest sector, Land use, Projections, Land Economics/Use,
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