Can a flavour-conserving treatment improve things ?

In this work I would like to present some ideas on how to improve on the gauge sector in our lattice simulations at finite baryon density. The long standing problem, that we obtain an onset in thermodynamic quantities at a much smaller chemical potential than expected, could be related to an unphysical proliferation of flavours due to hard gluons close to the Brillouin edges. These hard gluons produce flavour non-conserving vertices to the fermion sector. They also produce excessive number of small instantons due to lattice dislocations. Both unphysical effects could increase the propagation in (di)-quarks to give the early onset in $\mu$. Thus we will present here a modified action that avoids large fields close to the lattice cutoff. Some of these ideas have been tested for SU(2) and are being implemented for SU(3).Comment: Talk presented at the Intl. Workshop on QCD at Finite Baryon Density in Bielefeld, April 98. 5 pp in Latex, uses espcrc1.st

Real time correlations at finite Temperature for the Ising model

After having developed a method that measures real time evolution of quantum systems at a finite temperature, we present here the simplest field theory where this scheme can be applied to, namely the 1+1 Ising model. We will compute the probability that if a given spin is up, some other spin will be up after a time $t$, the whole system being at temperature $T$. We can thus study spatial correlations and relaxation times at finite $T$. The fixed points that enable the continuum real time limit can be easily found for this model. The ultimate aim is to get to understand real time evolution in more complicated field theories, with quantum effects such as tunneling at finite temperature.Comment: 3 pp in Latex, 2 ps Figs., presented at the Latt98 Conf. in Boulder C

Finite Density Results for Wilson Fermions Using the Volume Method

Nonzero chemical potential studies with Wilson fermions should avoid the proliferation of flavor-equivalent nucleon states encountered with staggered formulation of fermions. However, conventional wisdom has been that finite baryon density calculations with Wilson fermions will be prohibitively expensive. We demonstrate that the volume method applied to Wilson fermions gives surprisingly stable results on a small number of configurations. It is pointed out that this method may be applied to any local or nonlocal gauge invariant quantity. Some illustrative results for $$and$$ at various values of $\mu$ in a quenched lattice simulation are given.Comment: 3pp, Dec. 94

A Simple proof of Johnson-Lindenstrauss extension theorem

Johnson and Lindenstrauss proved that any Lipschitz mapping from an $n$-point subset of a metric space into Hilbert space can be extended to the whole space, while increasing the Lipschitz constant by a factor of $O(\sqrt{\log n})$. We present a simplification of their argument that avoids dimension reduction and the Kirszbraun theorem.Comment: 3 pages. Incorporation of reviewers' suggestion

No Place for Kids: The Case for Reducing Juvenile Incarceration

Reviews research on states' reliance on incarcerating juveniles in dangerous, ineffective, unnecessary, obsolete, wasteful, and inadequate facilities. Recommends ways to redesign corrections systems, including investing in non-residential alternatives

Time evolution for quantum systems at finite temperature

This paper investigates a new formalism to describe real time evolution of quantum systems at finite temperature. A time correlation function among subsystems will be derived which allows for a probabilistic interpretation. Our derivation is non-perturbative and fully quantized. Various numerical methods used to compute the needed path integrals in complex time were tested and their effectiveness was compared. For checking the formalism we used the harmonic oscillator where the numerical results could be compared with exact solutions. Interesting results were also obtained for a system that presents tunneling. A ring of coupled oscillators was treated in order to try to check selfconsistency in the thermodynamic limit. The short time distribution seems to propagate causally in the relativistic case. Our formalism can be extended easily to field theories where it remains to be seen if relevant models will be computable.Comment: uuencoded, 14 pp in Latex, 8 ps Fig

Maltreatment of Youth In U.S. Juvenile Corrections Facilities

In its 2011 report, "No Place for Kids: The Case for Reducing Juvenile Incarceration," the Annie E. Casey Foundation demonstrated that America's heavy reliance on juvenile incarceration is a failed strategy for addressing youth crime. Specifically, "No Place for Kids" showed that heavy reliance on correctional confinement exposes incarcerated youth to widespread maltreatment; results in alarming levels of recidivism; incarcerates children who do not pose significant threats to public safety; ignores the emergence of treatment models that produce better outcomes; wastes money with costs that often exceed $100,000 per young person per year; and fails to provide adequate mental health, educational, substance abuse and other services. This report focuses on the first of these challenges, the widespread and persistent maltreatment of youth confined in America's juvenile corrections facilities. These facilities often go by euphemistic labels such as training school, reformatory, correctional center, etc., but are in essence youth prisons