9,626 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
Stabilized NMSSM without Domain Walls
We reconsider the Next to Minimal Supersymmetric Standard Model (NMSSM) as a
natural solution to the -problem and show that both the stability and the
cosmological domain wall problems are eliminated if we impose a
-symmetry on the non-renormalizable operators.Comment: 5 page
Spontaneous R-Symmetry Breaking in O'Raifeartaigh Models
We study the question of whether spontaneous U(1)_R breaking can occur in
O'Raifeartaigh-type models of spontaneous supersymmetry breaking. We show that
in order for it to occur, there must be a field in the theory with R-charge
different from 0 or 2. We construct the simplest O'Raifeartaigh model with this
property, and we find that for a wide range of parameters, it has a meta-stable
vacuum where U(1)_R is spontaneously broken. This suggests that spontaneous
U(1)_R breaking actually occurs in generic O'Raifeartaigh models.Comment: 19 pages; v2: reference added, minor changes; v3: important typo
fixe
Meta-stable SUSY Breaking Model in Supergravity
We analyze a supersymmetry (SUSY) breaking model proposed by Intriligator,
Seiberg and Shih in a supergravity (SUGRA) framework. This is a simple and
natural setup which demands neither extra superpotential interactions nor an
additional gauge symmetry. In the SUGRA setup, the U(1)R symmetry is explicitly
broken by the constant term in the superpotential, and pseudo-moduli field
naturally takes non-zero vacuum expectation value through a vanishing
cosmological constant condition. Sfermions tend to be heavier than gauginos,
and the strong-coupling scale is determined once a ratio of sfermion to gaugino
masses is fixed.Comment: 13 page
Effect of FSH on testicular morphology and spermatogenesis in gonadotrophin-deficient hypogonadal mice lacking androgen receptors
Follicle stimulating hormone (FSH) and androgen act to stimulate and maintain spermatogenesis. FSH acts directly on the Sertoli cells to stimulate germ cell number and acts indirectly to increase androgen production by the Leydig cells. In order to differentiate between the direct effects of FSH on spermatogenesis and those mediated indirectly through androgen action we have crossed hypogonadal (hpg) mice which lack gonadotrophins with mice lacking androgen receptors (AR) either ubiquitously (ARKO) or specifically on the Sertoli cells (SCARKO). These hpg.ARKO and hpg.SCARKO mice were treated with recombinant FSH for 7 days and testicular morphology and cell numbers assessed. In untreated hpg and hpg.SCARKO mice germ cell development was limited and did not progress beyond the pachytene stage. In hpg.ARKO mice testes were smaller with fewer Sertoli cells and germ cells compared to hpg mice. Treatment with FSH had no effect on Sertoli cell number but significantly increased germ cell numbers in all groups. In hpg mice FSH increased numbers of spermatogonia and spermatocytes and induced round spermatid formation. In hpg.SCARKO and hpg.ARKO mice, in contrast, only spermatogonial and spermatocyte numbers were increased with no formation of spermatids. Leydig cell numbers were increased by FSH in hpg and hpg.SCARKO mice but not in hpg.ARKO mice. Results show that in rodents 1) FSH acts to stimulate spermatogenesis through an increase in spermatogonial number and subsequent entry of these cells into meiosis, 2) FSH has no direct effect on the completion of meiosis and 3) FSH effects on Leydig cell number are mediated through interstitial ARs
Learning Optimal Control of Synchronization in Networks of Coupled Oscillators using Genetic Programming-based Symbolic Regression
Networks of coupled dynamical systems provide a powerful way to model systems
with enormously complex dynamics, such as the human brain. Control of
synchronization in such networked systems has far reaching applications in many
domains, including engineering and medicine. In this paper, we formulate the
synchronization control in dynamical systems as an optimization problem and
present a multi-objective genetic programming-based approach to infer optimal
control functions that drive the system from a synchronized to a
non-synchronized state and vice-versa. The genetic programming-based controller
allows learning optimal control functions in an interpretable symbolic form.
The effectiveness of the proposed approach is demonstrated in controlling
synchronization in coupled oscillator systems linked in networks of increasing
order complexity, ranging from a simple coupled oscillator system to a
hierarchical network of coupled oscillators. The results show that the proposed
method can learn highly-effective and interpretable control functions for such
systems.Comment: Submitted to nonlinear dynamic
Canon Barnett and the first thirty years of Toynbee Hall
PhDThis thesis is a study of the changing role which Toynbee
Hall, the first university settlement, played in East London between
1884 and 1914. The first chapter presents a brief biography of
Sainiel Augustus Barnett, the founder and first warden of the
settlement, and analyzes his social thought in relation to the
beliefs which were current in Britain during the period. The
second chapter discusses the founding of the settlement, its organization, structure and the aims which underlay its early work. The
third chapter, concentrating on three residents, C.R. Ashbee, .H.
Beveridge and T. Edmund Harvey, shows the way in which subsequent
settlement workers reformulated these aims In accordance with their
own social and economic views. The subsequent chapters discuss the
accomplishments of the settlement in various fields. The fourth
shows that Toynbee Hall's educational program, which was largely an
attempt to work out Matthew Arnold's theory of culture, left little
impact on the life of East London. The fifth chapter discusses the
settlement residents' ineffectual attempts to establish contact with
working men's organizations. The final chapter seeks to demonstrate
that In the field of philanthropy the residents were far more successful than in any other sphere in adapting the settlement to changing
social thought
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