Finite Volume Effects and Quenched Chiral Logarithms

We have measured the valence pion mass and the valence chiral condensate on lattice configurations generated with and without dynamical fermions. We find that our data and that of others is well represented by a linear relationship between $m_{\pi}^2$ and the valence quark mass, with a non-zero intercept. For our data, we relate the intercept to finite volume effects visible in the valence chiral condensate. We see no evidence for the singular behavior expected from quenched chiral logarithms.Comment: 5 pages, Latex with included macro. 4 encapsulated postscript figures included. Contribution to Lattice '9

Predicting the Aoki Phase using the Chiral Lagrangian

This work is concerned with the phase diagram of Wilson fermions in the mass and coupling constant plane for two-flavor (unquenched) QCD. We show that as the continuum limit is approached, one can study the lattice theory using the continuum chiral Lagrangian, supplemented by additional terms proportional to powers of the lattice spacing. We find two possible phase structures at non-zero lattice spacing: (1) There is an Aoki phase of spontaneously broken flavor and parity, with two massless Goldstone-pions, and a width $\Delta m_0 \sim a^3$; (2) There is no spontaneous symmetry breaking, and all three pions have equal mass of order $a$. Present numerical simulations suggest that the former option is realized.Comment: LATTICE98(spectrum), 3 pages, 2 figures, LaTex, uses espcrc2.st

Is there an Aoki phase in quenched QCD?

We argue that quenched QCD has non-trivial phase structure for negative quark mass, including the possibility of a parity-flavor breaking Aoki phase. This has implications for simulations with domain-wall or overlap fermions.Comment: Parallel talk presented at Lattice2004(spectrum), Fermilab, June 21-26, 200

The Cruel Deception

With new legislation to replace the Cruelty to Animals Act 1876 near at hand, the powerful vested interest groups whose profits and livelihood depend on laboratory animals are stepping up their campaigns to ensure the survival of vivisection. Have the benefits really been so great, and can vivisection achieve major advances in our present state of health? History shows (McKeown 1979) that the real reasons for the dramatic increase in life expectancy since the middle of the last century are improvements in nutrition, living and working conditions, hygiene and sanitation, with medical measures only having a relatively marginal effect. The reduction in Britain\u27s death rate from the 1850s was almost exclusively due to the decline of the infections-mainly 1B, bronchitis, pneumonia, influenza, whooping cough, measles, scarlet fever, diphtheria, smallpox, and the waterand food-borne diseases such as cholera, typhoid, diarrhea, and dysentery. Mortality for nearly all the infections was declining before, and in most cases long before, specific therapies became available

Regional variations among ethnic groups in Ontario a core-periphery model

This thesis performs a spatial analysis of Ontario’s structure of ethnic stratification. It examines several spatial manifestations of the contrasts in socio-economic well-being—income, education, and occupation—between Ontario’s British majority and seven ethnic minority categories. The major data source for this analysis includes published Canadian Census data and special tabulations of the 1971 Census. Regional patterns of spatial distribution shown by the various ethnic categories are described and compared using location quotients and the centrographic statistical technique. Applying a core-periphery model of regional structure and development, a tendency was found for ethnic categories of subordinate socio-economic status to be disproportionately concentrated in Ontario’s geographic periphery of northern Ontario. On the other hand, ethnic minorities with a socio-economic status similar to that of the British majority were shown to be more spatially integrated within the Toronto-centred core of southern Ontario

Habeas Corpus in Canada

Habeas corpus is a subject which has not attracted much attention from legal writers and there has been no thorough examimation of the nature of review which may be exercised on habeas corpus.1 The aim of this article is to provide a critical and comprehensive account of the scope of review which is available on habeas corpus in Canada. The subject is a technical one but may be of crucial importance in those situations where habeas corpus is still a useful remedy. It is not proposed to discuss all aspects of the law of habeas corpus but simply to outline the nature of the powers of review which are available. In dealing with any aspect of the law of habeas corpus we are confronted by the vagaries of the common law and with a somewhat bewildering array of technical rules. The remedy as it exists in Canada is derived from English common law and it is important to read the Canadian authorities in the light of their common law origins. This paper aims to explore the common law background, to expound the rules which determine the scope of review and, hopefully, through a careful analysis of the cases, to demonstrate that the scope of review available on habeas corpus is not as narrow as is sometimes suggested

Injunctions and the Charter

In this short essay, Professor Sharpe outlines the challenge that faces the courts in fashioning suitable remedies in Charter litigation. In particular, he recommends that Canadian courts should look to the American experience and adopt it to the Canadian situation. He maintains that there is a constitutional mandate for the innovative and imaginative use of injunctive relief in Charter cases, especially in suits involving structural and institutional claims

The Constitutional Legacy of Chief Justice Brian Dickson

Chief Justice Brian Dickson played a central role in the elaboration of the fundamental values of the Canadian Constitution. He took a balanced approach to federalism, favouring neither federal nor provincial claims and inviting cooperation through overlapping jurisdiction. Dickson transformed the rule of law from a background value to an operative constitutional principle. His judgments on the rights of minorities reflect a remarkable empathy for the plight of the disadvantaged. Democracy informed all aspects of his constitutional thinking. Dickson rejected the contention that judicial review is anti-democratic, and his constitutional legacy reflects a sustained effort to harmonize all four fundament constitutional values