Charged-particle pseudorapidity density and anisotropic flow over a wide pseudorapidity range using ALICE at the LHC

The pseudorapidity density and anisotropic flow of charged-particles provide fundamental information about global variables and correlations in heavy-ion collisions. The pseudorapidity density is related to the energy available for particle production while the anisotropic flow is related to collective effects from interactions between these particles. Extending these measurements to very forward pseudorapidities yields information about the longitudinal expansion of the system. The first measurements performed at the LHC over more than 8 units of pseudorapidity are presented. The longitudinal scaling of the measurements is analyzed and comparison to models is performed.Comment: 4 pages, 5 figures, Proceedings for Hot Quarks 2012 workshop (October 14-20, 2012, Copamarina, Puerto Rico

Method for High Accuracy Multiplicity Correlation Measurements

Multiplicity correlation measurements provide insight into the dynamics of high energy collisions. Models describing these collisions need these correlation measurements to tune the strengths of the underlying QCD processes which influence all observables. Detectors, however, often possess limited coverage or reduced efficiency that influence correlation measurements in obscure ways. In this paper, the effects of non-uniform detection acceptance and efficiency on the measurement of multiplicity correlations between two distinct detector regions (termed forward-backward correlations) are derived. An analysis method with such effects built-in is developed and subsequently verified using different event generators. The resulting method accounts for acceptance and efficiency in a model independent manner with high accuracy thereby shedding light on the relative contributions of the underlying processes to particle production.Comment: 28 pages, 13 figures. Updated for having pseudorapidity dependent efficiency gradient

Finite subschemes of abelian varieties and the Schottky problem

The Castelnuovo-Schottky theorem of Pareschi-Popa characterizes Jacobians, among indecomposable principally polarized abelian varieties of dimension g, by the existence of g+2 points in general position with respect to the principal polarization, but special with respect to twice the polarization, and furthermore states that such collections of points must be contained in an Abel-Jacobi curve. Building on the ideas in the original paper, we give here a self contained, scheme theoretic proof of the theorem, extending it to finite, possibly nonreduced subschemes.Comment: 22 pages. A few expository changes and some references added according to suggestions from the referee. To appear in Annales de l'Institut Fourie

The technical-industrial research institutes in the Norwegian innovation system

This paper analyses the role of technical-industrial research institutes for industrial innovation in Norway. Using statistical data and a survey among firms, the paper shows that there are many different types of interaction between institutes and firms. In addition to R&D and technical services, the institutes are a significant source of skilled manpower for firms. We highlight three central roles for the institutes: they are a learning partner for industry, they help increase absorptive capacity, and they constitute a flexible repository in the innovation system by helping firms in peak periods and by reducing the pressure on universities through assisting in teaching and supervision.

Public sector research and industrial innovation in Norway: a historical perspective

This paper analyses the historical role of public research organisations for industrial growth and innovation in Norway – and the changes in this role over time. Public research organisations include research institutes and higher education institutions, and we go back in time to the 19th century. Like many other countries, Norway has a large number research institutes involved in innovation, and these organisations have an equally long history as higher education institutions. Public sector research has co-evolved with the national industrial structure, and institutes and universities have played central roles in developing high technology sectors and activities as well as in modernisations of traditional industries.