Saddle Points Stability in the Replica Approach Off Equilibrium

We study the replica free energy surface for a spin glass model near the glassy temperature. In this model the simplicity of the equilibrium solution hides non trivial metastable saddle points. By means of the stability analysis performed for one and two real replicas constrained, an interpretation for some of them is achieved.Comment: 10 pages and 3 figures upon request, Univerista` di Roma I preprint 94/100

Organizational time: a dialectical view

We present twelve propositions constituting a contribution to a contingency view of time in organizations and synthesize apparently opposite perspectives of time. To articulate them, we relate the planning, action and improvisation strategic orientations to the dependent, independent and interdependent perspectives of the environment. Then, we relate these strategic orientations related to approaches to the problems of scheduling, synchronization and time allocation. Action strategies rely on event time to handle scheduling, use entrainment to synchronize with their environment and view time as linear. Planning strategies use even time to handle scheduling, impose their internal pacing upon the environment and view time as cyclic. Improvisation strategies use even-event time to handle scheduling, synchronize via internal-external pacing and hold a spiral view of time. Our argument strengthens the case for a more deliberate approach to time in organizations and favors a dialectical view of organizational phenomena.action, contingency, dialectics, improvisation, planning, synthesis, time

Bricolage in organizations

Theories of management and organization have traditionally overlooked the concept of bricolage. Focused on the rationality of resource allocation, scholars have missed the relevance of the skill of “inventing” resources from available materials. Changes in the nature of competition are, however, stressing the importance of speed and change as competitive factors in shifting environments. In these environments it may be impossible to search and wait for the presumably adequate resources. Bricolage, therefore, may be a relevant practice in these environments. This article discusses the concept of organizational bricolage by asking such questions as: What is bricolage? Why is bricolage a relevant practice? Why is bricolage so often ignored? How can it be facilitated?resources; resourcing; bricolage; improvisation

Baryogenesis and Dark Matter from BB Mesons

We present a new mechanism of Baryogenesis and dark matter production in which both the dark matter relic abundance and the baryon asymmetry arise from neutral $B$ meson oscillations and subsequent decays. This set-up is testable at hadron colliders and $B$-factories. In the early Universe, decays of a long lived particle produce $B$ mesons and anti-mesons out of thermal equilibrium. These mesons/anti-mesons then undergo CP violating oscillations before quickly decaying into visible and dark sector particles. Dark matter will be charged under Baryon number so that the visible sector baryon asymmetry is produced without violating the total baryon number of the Universe. The produced baryon asymmetry will be directly related to the leptonic charge asymmetry in neutral $B$ decays; an experimental observable. Dark matter is stabilized by an unbroken discrete symmetry, and proton decay is simply evaded by kinematics. We will illustrate this mechanism with a model that is unconstrained by di-nucleon decay, does not require a high reheat temperature, and would have unique experimental signals -- a positive leptonic asymmetry in $B$ meson decays, a new decay of $B$ mesons into a baryon and missing energy, and a new decay of $b$-flavored baryons into mesons and missing energy. These three observables are testable at current and upcoming collider experiments, allowing for a distinct probe of this mechanism.Comment: 17 pages, 6 figures. v2: references added, corrected the antinucleon abundance calculation (sec III.C.iii), and included comments on the viability of a measurement of the decay of $b$-flavored baryons into mesons and missing energy at hadron colliders (sec IV.A.iii). v3: matches the published versio