Flavoured Soft Leptogenesis

We study the impact of flavour in ``soft leptogenesis'' (leptogenesis induced by soft supersymmetry breaking terms). We address the question of how flavour effects can affect the region of parameters in which successful soft leptogenesis induced by CP violation in the right-handed sneutrino mixing is possible. We find that for decays which occur in the intermediate to strong washout regimes for all flavours, the produced total $B-L$ asymmetry can be up to a factor ${\cal O}(30)$ larger than the one predicted with flavour effects being neglected. This enhancement, permits slightly larger values of the required lepton violating soft bilinear term.Comment: 20 pages, 5 figures. Version accepted in JHEP. Results unchange

What’s the Monetary Value of Distributive Justice?

This paper proposes a model that can be implemented to estimate the willingness to pay for distributive justice. A formula is derived that allows one to recover the willingness to pay for distributive justice from the estimated coefficients of a probit regression and fiscal data. Using this formula and data from a 1998 Gallup Social Audit, we find that the monetary value of justice in the United States is about one fifth of GDP. We find no evidence that the value of justice varies across types of people.distributive justice, governmental redistribution, fairness

What´s the monetary value of distributive justice

This paper proposes a model that can be implemented to estimate the willingness to pay for distributive justice, defined as distribution according to desert. We derive a formula that allows one to recover the willingness to pay for distributive justice from fiscal data and the estimated coefficients of a probit regression. Using this formula and data from a 1998 Gallup Social Audit, we find that on average the monetary value of justice for US households amounts to about one fifth of their disposable income. Moreover, we find evidence of markedly heterogeneous preferences for justice along the lines of race and education. --Distributive Justice,Governmental Redistribution,Fairness

What Determines Giving to Hurricane Katrina Victims? Experimental Evidence on Income, Race, and Fairness

We investigate determinants of private and public generosity to Katrina victims using an artifactual field experiment. In this experiment, respondents from the general population viewed a short audiovisual presentation that manipulated respondents' perceptions of the income, race, and deservingness of Katrina victims in one of two small cities. Respondents then decided how to split $100 between themselves and a charity helping Katrina victims in this small city. We also collected survey data on subjective support for government spending to help the Katrina victims in the cities. We find, first, that our income manipulation had a significant effect on giving; respondents gave more when they perceived the victims to be poorer. Second, the race and deservingness manipulations had virtually no effect on average giving. Third, the averages mask substantial racial bias among sub-groups of our sample. For instance, the subgroup of whites who identify with their ethnic or racial group strongly biased their giving against blacks. Finally, subjective support for government spending to help Katrina victims was significantly influenced by both our race and deservingness manipulations, but not by the income manipulation. White respondents supported significantly less public spending for black victims and significantly more for victims who were described in more flattering terms, such as being helpful and law-abiding.

Do Race and Fairness Matter in Generosity? Evidence from a Nationally Representative Charity Experiment

We present a dictator game experiment where the recipients are local charities that serve the poor. Donors consist of approximately 1000 participants from a nationally representative respondent panel that is maintained by a private survey research firm, Knowledge Networks. We randomly manipulate the perceived race and worthiness of the charity recipients by showing respondents an audiovisual presentation about the recipients. The experiment yields three main findings. First, we find significant racial bias in perceptions of worthiness: respondents rate recipients of their own racial group as more worthy. Second, respondents give significantly more when the recipients are described as more worthy. These findings may lead one to expect that respondents would also give more generously when shown pictures of recipients belonging to their own racial group. However, our third result shows that this is not the case; despite our successfully manipulating perceptions of race, giving does not respond significantly to recipient race. Thus, while our respondents do seem to rate ingroup members as more worthy, they appear to overcome this bias when it comes to giving.

Magnetic Collective Mode Dispersion in High Temperature Superconductors

Recent neutron scattering experiments in the superconducting state of YBCO have been interpreted in terms of a magnetic collective mode whose dispersion relative to the commensurate wavevector has a curvature opposite in sign to a conventional magnon dispersion. The purpose of this article is to demonstrate that simple linear response calculations are in support of a collective mode interpretation, and to explain why the dispersion has the curvature it does.Comment: 3 pages, revtex, 4 encapsulated postscript figure

Environmental Pollution and Chronic Disease Management – A Prognostics Approach

No abstract available

Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet

We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For $D<D_c$ the system is in a moment-free phase and for $D>D_c$ the system develops antiferromagnetic long-range order. The quantum critical point is found to be $D_c \simeq 0.1J$ using exact diagonalizations and finite-size scaling. This suggests that the kagome compound ZnCu$_3(OH)$_6$Cl$_3$ may be in a quantum critical region controlled by this fixed point.Comment: 5 pages, 4 figures; v2: add. data included, show that D=0.1J is at a quantum critical poin

Information, Trading and Stock Returns: Lessons from Dually-Listed Securities

This paper compares the intra-day patterns on the NYSE and AMEX of volatility, trading volume and bid-ask spreads for European dually- listed stocks, Japanese dually-listed stocks also listed in London, and Japanese dually-listed stocks not listed in London with American stocks of comparable average trading volume and volatility. It is shown that the intra-day patterns for these stocks are remarkably similar even though the public information flows differ markedly across these stocks during the trading day. In the morning, Japanese stocks have the greatest volatility and volume, followed by European stocks and American stocks. These rankings are reversed in the afternoon. We argue that these patterns are consistent with markets reacting to the overnight accumulation of public information which is greatest for Japanese stock and smallest for American stocks and inconsistent with the view that early morning volatility can be attributed to monopolistic specialist behavior.