Anisotropic flow measured from multi-particle azimuthal correlations for Pb-Pb collisions at 2.76 TeV by ALICE at the LHC

We report on the measurement of various flow harmonics, $v_n$, with multi-particle cumulants, and present the results from a study of the inter-correlation among different order symmetry planes $\Psi_n$ via multi-particle mixed harmonic correlations. This provides comprehensive experimental information on the fluctuating event-by-event shape of the initial conditions, which is currently among the main sources of large theoretical uncertainties in describing the evolution of the system created in heavy-ion collisions.Comment: 4 pages, 4 figures, Proceedings for Quark Matter 2012, Washington D.C., August 13-18, 201

Recent results on anisotropic flow and related phenomena in ALICE

The exploration of properties of an extreme state of matter, the Quark--Gluon Plasma, has broken new ground with the recent Run 2 operation of the Large Hadron Collider with heavy-ion collisions at the highest energy to date. With the heavy-ion data taken at the end of 2015, the ALICE Collaboration has made the first observation of anisotropic flow of charged particles and related phenomena in lead--lead collisions at the record breaking energy of 5.02 TeV per nucleon pair. The Run 2 results come after the proton-lead collisions, which provided a lot of unexpected results obtained with two- and multi-particle correlation techniques. In these proceedings, a brief overview of these results will be shown. We will discuss how they further enlighten the properties of matter produced in ultrarelativistic nuclear collisions. We indicate the possibility that, to leading order, the striking universality of flow results obtained with correlation techniques in pp, p--A and A--A collisions might have purely mathematical origin, and that physical conclusions therefore could be drawn only from the subleading orders.Comment: 4 pages, 2 figures. Proceedings for Rencontres de Moriond conference, March 19-26, 201

Vacancies, Hirings, and the Duration Function

While the matching function relates hirings (H) to vacancies (V) and unemployment, the duration function relates the average duration of vacancies as measured by V/H to unemployment. Shifts of the duration function are equivalent to shifts of the matching function but easier to interpret. Therefore, this paper focuses on the microfoundations of the duration function. We find, first, that outward shifts of the duration function, or, equivalently, longer recruitment times at given unemployment, have no direct effects on hirings. Second, the effect of longer recruitment times on hirings through higher recruitment costs depends on the relative importance of vacancy costs in total recruitment costs, where vacancy costs include the opportunity cost of unfilled jobs. Third, this paper reports information on unfilled jobs (unmet demand) as distinct from job vacancies (recruitment processes) according to a new business survey in Sweden.Job vacancies; hirings; friction; matching function; Beveridge curve

Market Sharing and Price Leadership

This paper proposes an alternative to the traditional model of supply and demand in markets where consumers take prices as given. Within the framework of “no side payments and partial preplay communication” firms are assumed to decide non-cooperatively on production and marketing while the market price is set by a competitive price leader, i.e. a firm preferring the lowest market price. Predictions include excess supply and a revenuemaximizing market price in markets where production precedes sales. In markets where sales precede production competitive price leadership predicts monopoly pricing but not necessarily monopoly profits if firms are “sufficiently similar”, while the presence of firms with high costs or low capacities will make it possible for the price leader, in some circumstances, to increase its market share and also its profits by reducing its price. And the threat of costly competition for market shares may reduce the market price even for identical firms.Pricing; oligopoly; price leadership; market sharing