The phase structure of a chirally invariant lattice Higgs-Yukawa model - numerical simulations

The phase diagram of a chirally invariant lattice Higgs-Yukawa model is explored by means of numerical simulations. The results revealing a rich phase structure are compared to analytical large Nf calculations which we performed earlier. The analytical and numerical results are in excellent agreement at large values of Nf. In the opposite case the large Nf computation still gives a good qualitative description of the phase diagram. In particular we find numerical evidence for the predicted ferrimagnetic phase at intermediate values of the Yukawa coupling constant and for the symmetric phase at strong Yukawa couplings. Emphasis is put on the finite size effects which can hide the existence of the latter symmetric phase.Comment: 14 pages, 11 figure

MORAL LEADERSHIP: EXPLORING THE FOUNDATIONS OF GOOD GOVERNANCE

His Majesty King Bhumibol Adulyadej, is not only a formidable leader who has taken the well-being of his country to this heart but that he is also a moral leader of extraordinary stature. As he exemplifies the most characteristic qualities of moral leadership, he continues to provide moral guidance and vision for all his subjects, most importantly for those in positions of power in government, the judiciary, the military, and administration, extending all the way to leaders in business, education, and society at large. This paper will take inspiration from His Majesty to meditate on the meaning of moral leadership in general

Christian Moral Resources for Economic Justice and Sustainability

As the recent global economic crisis has shown, we cannot leave the search for solutions exclusively to politicians and the so-called experts in finance and economics. It has become apparent that the usual economic focus on continued growth and short-term profitability is not sustainable and needs to be readjusted. This paper proposes that the moral resources of religions are a precious heritage of humanity in its search for meaning and the good life. This wisdom should not be restricted to the faithful but be made available to secular society as well. For the Christian churches, this seems to require firstly taking stock of their social and moral teachings and secondly translating them into a language that is comprehensible to believers and non-believers alike and that can inspire the moral discourse in pluralist society

Reason, Faith, and Secularization: Jürgen Habermas Meets Joseph Cardinal Ratzinger

The debate between the two leading representatives of critical theory and Catholic theology on the moral and (presumably) religious foundations of the secular state that can neither be vindicated nor ignored by secular reason has drawn great attention far across the borders that tend to separate theologians from liberal philosophers. The paper seeks to explore the historical context of the debate and to identify major areas of agreement between the two discussants before it examines some of the more important remaining differences. With the subsequent election of Cardinal Ratzinger as Pope and the programmatic implications of his Papal name the debate has taken on a new significance by highlighting the continuous need for dialogue and deeper understanding between the Church and all people of good will regardless of intellectual background or ideological affiliations

Do we Know Art When we see It? Philosophical Explorations in Aesthetics

Never in history was art more present everywhere and never was it more valuable. Yet, in the wake of Duchamp and Warhol, the understanding of what art is and how it is recognized is more problematic today than any time in history. This paper examines the various approaches to how one recognizes a work of art as a work of art. It examines the history of aesthetic theory and the variousways artwas defined. In the end it considers the value of the more hermeneutic and holistic interpretations of art put forward by Heidegger, Gadamer, Danto and Beuys

Lattice chirality and the decoupling of mirror fermions

We show, using exact lattice chirality, that partition functions of lattice gauge theories with vectorlike fermion representations can be split into "light" and "mirror" parts, such that the "light" and "mirror" representations are chiral. The splitting of the full partition function into "light" and "mirror" is well defined only if the two sectors are separately anomaly free. We show that only then is the generating functional, and hence the spectrum, of the mirror theory a smooth function of the gauge field background. This explains how ideas to use additional non-gauge, high-scale mirror-sector dynamics to decouple the mirror fermions without breaking the gauge symmetry--for example, in symmetric phases at strong mirror Yukawa coupling--are forced to respect the anomaly-free condition when combined with the exact lattice chiral symmetry. Our results also explain a paradox posed by a recent numerical study of the mirror-fermion spectrum in a toy would-be-anomalous two-dimensional theory. In passing, we prove some general properties of the partition functions of arbitrary chiral theories on the lattice that should be of interest for further studies in this field.Comment: 29 pages, 2 figures; published version, new addendu

Extreme self-organization in networks constructed from gene expression data

We study networks constructed from gene expression data obtained from many types of cancers. The networks are constructed by connecting vertices that belong to each others' list of K-nearest-neighbors, with K being an a priori selected non-negative integer. We introduce an order parameter for characterizing the homogeneity of the networks. On minimizing the order parameter with respect to K, degree distribution of the networks shows power-law behavior in the tails with an exponent of unity. Analysis of the eigenvalue spectrum of the networks confirms the presence of the power-law and small-world behavior. We discuss the significance of these findings in the context of evolutionary biological processes.Comment: 4 pages including 3 eps figures, revtex. Revisions as in published versio

Short-wavelength photoluminescence and electroluminescence in Ga(Al)P/GaP staggered type II quantum wells

Photoluminescence spectra of tailored Ga(A1)P/GaP quantum well heterostructures exhibit strong short-wavelength peaks at 363, 560, and 600−700 nm. The peak at 560 nm seems to originate from a no-phonon transition. All the transitions are observed up to 200 K. Light emitting diodes made with the same heterostructure predominently emit 560 nm light (green) with a background of 700 nm (red) at room temperature under cw operation. © 1997 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/69925/2/APPLAB-71-22-3260-1.pd

Non-Fermi-liquid effect in magnetic susceptibility

Taking into account the anomalous self-energy for quarks due to the dynamic screening effect for the transverse gluon propagator, we study the temperature dependence of the magnetic susceptibility in detail. It is shown that there does not exist the $T\ln T$ term in the susceptibility, different from the specific heat, but an anomalous $T^2\ln T$ term arises instead as a novel non-Fermi-liquid effect.Comment: 10 pages, 1 figur

How to make Dupire's local volatility work with jumps

There are several (mathematical) reasons why Dupire's formula fails in the non-diffusion setting. And yet, in practice, ad-hoc preconditioning of the option data works reasonably well. In this note we attempt to explain why. In particular, we propose a regularization procedure of the option data so that Dupire's local vol diffusion process recreates the correct option prices, even in manifest presence of jumps