Faddeev treatment of long-range correlations and the one-hole spectral function of O16

The Faddeev technique is employed to study the influence of both particle-particle and particle-hole phonons on the one-hole spectral function of O16. Collective excitations are accounted for at a random phase approximation level and subsequently summed to all orders by the Faddeev equations to obtain the nucleon self-energy. An iterative procedure is applied to investigate the effects of the self-consistent inclusion of the fragmentation in the determination of the phonons and the corresponding self-energy. The present results indicate that the characteristics of hole fragmentation are related to the low-lying states of O16.Comment: 10 pages, 6 figures, 3 tables. Submitted to Phys.Rev.

Alice in Euroland

The paper contains a detailed critique of the common currency arrangements of the Economic and Monetary Union, embodied in the laws and emerging procedural arrangements that govern the actions of its key institutions: the European Central Bank and the European System of Central Banks. The main message here is 'Great idea, shame about the execution'. A number of improvements are then proposed. Some of these require amending the Treaty, including an end to the rule that each EMU member's national central bank has a seat on the Governing Council or the removal of the power of the Council of Ministers to give 'general orientations' for exchange rate policy. Others, notably in the areas of accountability, openness and transparency, could be implemented immediately, including publication of voting records, minutes and the inflation forecast. Improved arrangements are also advocated for the co-ordination of monetary and fiscal policy. And the article calls for a European Parliament that can both bark and bite.

Monetary Misconceptions

The paper identifies a number of misconceptions about the monetary policy process and the monetary transmission mechanism in the UK. Among the misconceptions about the process are the alleged lack of regional and sectoral representativeness of the Monetary Policy Committee and the view that operational central bank independence means that monetary and fiscal policy are not properly coordinated. Among the transmission mechanism misconceptions, the "New Paradigm" figures prominently. Among the New Paradigm changes in the British economy that have been given prominence are the following: increasing openness; lower global inflation; lower profit margins, reflecting stronger competitive pressures; buoyant stock markets; a lower natural rate of unemployment; and a higher trend rate of growth of productivity. I argue that the New Paradigm has been over-hyped and misunderstood as regards its implications for monetary policy. Other misconceptions include the 'death of inflation', the 'end of boom and bust', a couple of Neanderthal Keynesian fallacies and the monetary fine tuning fallacy.Monetary policy, inflation targeting, New Paradigm, stabilisation policy

Strongly Regular Graphs with Maximal Energy

The energy of a graph is the sum of the absolute values of the eigenvalues of its adjacency matrix. Koolen and Moulton have proved that the energy of a graph on n vertices is at most n(1 + √n)/2, and that equality holds if and only if the graph is strongly regular with parameters (n, (n+√n)/2, (n+2√n)/4, (n+2√n)/4). Such graphs are equivalent to a certain type of Hadamard matrices. Here we survey constructions of these Hadamard matrices and the related strongly regular graphs.Graph energy;Strongly regular graph;Hadamard matrix.

Pigouvian pricing and stochastic evolutionary implementation

pricing;game theory

Conditions for Singular Incidence Matrices

Suppose one looks for a square integral matrixN, for which NN has a prescribed form.Then the Hasse-Minkowski invariants and the determinant of NN lead to necessary conditions for existence.The Bruck-Ryser-Chowla theorem gives a famous example of such conditions in case N is the incidence matrix of a square block design.This approach fails when N is singular.In this paper it is shown that in some cases conditions can still be obtained if the kernels of N and N are known, or known to be rationally equivalent.This leads for example to non-existence conditions for selfdual generalised polygons, semi-regular square divisible designs and distance-regular graphs.singularities;matrices;graphs

Potential games with continuous player sets

game theory

Fatigue Behavior of Welded Joints and Weldments in HY-80 Steel Subjected to Axial Loadings

Bureau of Ships, U.S. Navy.Contract N0bs 77137Index No. NS-021-20

Negative externalities and evolutionary implementation

game theory;externalities