Exact time evolution in harmonic quantum Brownian motion

We consider a particular (exactly soluble) model of the one discussed in a previous work. We show numerical results for the time evolution of the main dynamical quantities and compare them with analytical results.Comment: 7 pages, 4 figures, Revtex, submitted to Physica

Coherence between values and successor socialization: Facilitating family business continuity

The problem of CEO succession is critically important yet unique and distinct from that of turnover at other levels. Research in management agrees with the findings in family business research regarding the preference for an insider as successor, more specifically a family insider. Successful family business continuity requires raising potential successors who will add value to the firm by seeking new opportunities and fostering entrepreneurship. Parties external to the firm are likely to view succession as a signal about the institution's future; this makes CEO succession a critical event for virtually every organization. In this paper the authors outline a model that presents the different coherent options for value transmission and successor socialization that facilitate family business continuity from first to second generation. The findings are grounded in combined qualitative and quantitative techniques applied to an extensive research project involving in-depth cross-case analysis. Based on the results, the authors identify issues that families and practitioners should take into account to maintain consistency during the succession process. Professionals can assist families in preparing for continuity by: 1) identifying family value systems; 2) analyzing the variables at play in the family-business system, and 3) proposing a coherent option of continuity that both family and business can pursue. The model presented in this paper is intended to help families and practitioners follow this path by pointing out coherent combinations of values and family business characteristics and different successor socialization processes.family business; succession; values; successors; socialization;

Symplectic gauge fields and dark matter

The dynamics of symplectic gauge fields provides a consistent framework for fundamental interactions based on spin three gauge fields. One remarkable property is that symplectic gauge fields only have minimal couplings with gravitational fields and not with any other field of the Standard Model. Interactions with ordinary matter and radiation can only arise from radiative corrections. In spite of the gauge nature of symplectic fields they acquire a mass by the Coleman-Weinberg mechanism which generates Higgs-like mass terms where the gravitational field is playing the role of a Higgs field. Massive symplectic gauge fields weakly interacting with ordinary matter are natural candidates for the dark matter component of the Universe.Comment: 16 page

Noise rectification in quasigeostrophic forced turbulence

We study the appearance of large scale mean motion sustained by stochastic forcing on a rotating fluid (in the quasigeostrophic approximation) flowing over topography. As in other noise rectification phenomena, the effect requires nonlinearity and absence of detailed balance to occur. By application of an analytical coarse graining procedure we identify the physical mechanism producing such effect: It is a forcing coming from the small scales that manifests in a change in the effective viscosity operator and in the effective noise statistical properties.Comment: 4 pages revtex, including 5 figures. Related material at http://www.imedea.uib.es/Nonlinear and http://www.imedea.uib.es/Oceanography Figure 4 replaced by a slightly better on

Some remarks about intrinsic parity in Ryder's derivation of the Dirac equation

This work is a comment on Ryder's derivation of the Dirac equation, with emphasis on the physical contents of this equation: the notion of particles and antiparticles according to the Stueckelberg-Feynman interpretation, the opposite intrinsic parity between particles and antiparticles, and the spin.Comment: 4 pages, Revte