403 research outputs found
New Minimal Extension of MSSM
We construct a new minimal extension of the Minimal Supersymmetric Standard
Model (MSSM) by promoting the -parameter to a singlet superfield. The
resulting renormalizable superpotential is enforced by a
-symmetry which is imposed on the non-renormalizable operators as well. The
proposed model provides a natural solution to the -problem and is free
from phenomenological and cosmological problems.Comment: 5 page
Minimal Nonminimal Supersymmetric Standard Model
We review the basic field-theoretic and phenomenological features of the
recently introduced Minimal Nonminimal Supersymmetric Standard Model (MNSSM).
The introduced model is the simplest and most economic version among the
proposed nonminimal supersymmetric models, in which the so-called -problem
can be successfully addressed. As opposed to the MSSM and the
frequently-discussed NMSSM, the MNSSM can naturally predict the existence of a
light charged Higgs boson with a mass smaller than 100 GeV. Such a possible
realization of the Higgs sector can be soon be tested at the upgraded Run II
phase of the Tevatron collider.Comment: 8 pages, 4 figures, talk given at the conference ``Beyond the Desert
2002,'' 2--7 June 2002, Oulu, Finlan
Sustainability management : insights from the viable system model
A review of current literature on sustainability standards reveals a significant gap between their adoption and the implementation of sustainability into every level of the organisation. In this paper, it is argued that in order to overcome this challenge, an appropriate model of an organisation is needed. The Viable System Model (VSM) is proposed as such a model and, in order to illustrate this argument, it is used to interpret the ISO 26000 standard on Social Responsibility (SR). First, the VSM theory is introduced and presented by modelling the hypothetical company Widget Co. Then, the clauses of ISO 26000 are mapped on the Widget Co. model, together with detailed descriptions and examples on the organisational and managerial implications of its adopting the standard's guidelines. The result is the identification of generic SR functions that need to be performed by the various organisational governance systems, as well as their dynamic interrelations, thus clarifying implementation issues. Moreover, by identifying different SR management layers, VSM is suggested as a way forward to develop an integration model for SR issues and respective sustainability tools. Finally, a discussion is given on the implications of using this approach to integrate sustainability standards and the way this research contributes to recent developments in sustainability research
Realizations of Hybrid Inflation in Supergravity with natural initial conditions
We present viable F-term realizations of the hybrid inflationary scenario in
the context of supergravity addressing at the same time the well-known problems
of the initial conditions and of the adequate suppression of the inflaton mass.
An essential role in our construction is played by "decoupled" superheavy
fields without superpotential acquiring large vevs due to D-terms associated
with "anomalous" U(1) gauge symmetries. The naturalness of the initial
conditions is achieved through a "chaotic" inflation starting at energies close
to the Planck scale and driven by the "anomalous" D-terms. We discuss two
distinct mechanisms leading to such an early "chaotic" D-term inflation which
depend on the choice of the K\"ahler potential involving the superheavy fields.
The one relies on a choice of the K\"ahler potential of the
K\"ahler manifold of the type encountered in no-scale supergravity whereas the
other employs a more "conventional" choice for the K\"ahler potential of the
or K\"ahler manifold but invokes rather specific
valuesof the Fayet-Iliopoulos term.Comment: 32 pages LATEX, no figure
Integrated sustainability management for organizations
Purpose – The purpose of this paper is to propose the Viable System Model (VSM) as an effective model to base the analysis of organizational sustainability (long-term viability). It is specifically proposed as a model to integrate the various sustainability tools, and as the basis for designing a unified Sustainability Management System. Design/methodology/approach – The VSM is used as an organizational model to examine three prominent sustainability standards: ISO 26000, ISO 14001 and ISO 14044. A generic manufacturing company is used as a template; and its typical business processes are related to each of the VSM’s components. Each clause of the three sustainability standards is then mapped on to the VSM model. These three models are integrated into one, by analysing the differences, similarities and complementarities in the context of each VSM component, and by identifying common invariant functions. Findings – In all, 12 generic sustainability functions are identified. ISO 26000 has the widest scope; ISO 14001 is focused primarily on internal measurement and control (System 3), while ISO 14044 is a complex performance indicator at the System 3 level. There is a general absence of System 2. Each standard can be regarded as a distinct management layer, which needs to be integrated with the Business Management layer. Research limitations/implications – Further research is needed to explore the specifics of integration. Practical implications – This integration should not be based on creating distinct roles for each management layer. Originality/value – The paper uses the insights of organizational cybernetics to examine prominent sustainability standards and advance sustainability management at the business level
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