263 research outputs found
Black hole entropy in scalar-tensor and f(R) gravity: an overview
A short overview of black hole entropy in alternative gravitational theories
is presented. Motivated by the recent attempts to explain the cosmic
acceleration without dark energy, we focus on metric and Palatini f(R) gravity
and on scalar-tensor theories.Comment: 24 pages, latex, to appear in "Entropy in Quantum Gravity", special
issue of Entropy, R. Garattini editor
Royal Swedish Academy of Sciences Economic Growth and the Environment in Yugoslavia
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of the Nature of the Preparation of Practice Educators in Five Health Care Disciplines
Overview This study aimed to investigate university-based preparation of physiotherapy practice-based educators, in order to explore perceived needs and identify principles of good practice. Physiotherapy (alongside occupational therapy, radiography, dietetics and nursing) was studied throughout the UK and Ireland. Questionnaires were sent out to all pre-registration physiotherapy courses (n=37) and 21 were returned, giving a response rate of 57%. The questionnaire findings were synthesised with analysis of policy documents and the wider literature Current practice Students must complete a minimum of 1000 hours of assessed satisfactory clinical practice under the supervision of a practice-based educator, who must be a registered physiotherapist. All universities provide training for clinical educators, but the nature of provision varies. There is a nation-wide shortage of clinical placements within physiotherapy at a time when student numbers are rising. The debate on how to counteract the placement crisis centres on three main issues: • The requirement for specialist physiotherapy practice placements in defined areas. • Models of clinical supervision where physiotherapy practice educators are responsible for more than one student. • The timing of physiotherapy placements within the curriculum and competition for placements in particular geographical areas. The perceived benefits of being a clinical educator include the contribution it makes to continuing professional development, fulfilment of professional responsibility and the opportunity to market services to potential recruits. Problems associated with taking students on placement were perceived to derive largely from resource constraints. Discussion Several areas of innovative practice emerged in the areas of practice educator preparation, interprofessional student learning, models of student supervision and evidencing student competence in specialist areas. The Chartered Society of Physiotherapy has recently launched a scheme for accrediting clinical educators (ACE) that it hopes will be adopted across all courses. Summary Increasing student numbers places growing pressure on an already stretched placement resource. There are many challenges in providing appropriate clinical learning experiences, particularly as physiotherapy moves increasingly towards primary care and interprofessional working. It is recommended that managers, universities and the multidisciplinary team should adopt key roles in supporting physiotherapy practice-based educators. Profile PHYSIOTHERAPY content
The complete spectrum of the area from recoupling theory in loop quantum gravity
We compute the complete spectrum of the area operator in the loop
representation of quantum gravity, using recoupling theory. This result extends
previous derivations, which did not include the ``degenerate'' sector, and
agrees with the recently computed spectrum of the connection-representation
area operator.Comment: typos corrected in eqn.(21). Latex with IOP and epsf styles, 1 figure
(eps postscript file), 12 pages. To appear in Class. Quantum Gra
Axion gauge symmetries and generalized Chern-Simons terms in N=1 supersymmetric theories
We compute the form of the Lagrangian of N=1 supersymmetric theories with
gauged axion symmetries. It turns out that there appear generalized
Chern-Simons terms that were not considered in previous superspace formulations
of general N=1 theories. Such gaugings appear in supergravities arising from
flux compactifications of superstrings, as well as from Scherk-Schwarz
generalized dimensional reduction in M-theory. We also present the dual
superspace formulation where axion chiral multiplets are dualized into linear
multiplets.Comment: References added and few misprints correcte
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Absence of charge backscattering in the nonequilibrium current of normal-superconductor structures
We study the nonequilibrium transport properties of a
normal-superconductor-normal structure, focussing on the effect of adding an
impurity in the superconducting region. Current conservation requires the
superfluid velocity to be nonzero, causing a distortion of the quasiparticle
dispersion relation within the superconductor. For weakly reflecting interfaces
we find a regime of intermediate voltages in which Andreev transmission is the
only permitted mechanism for quasiparticles to enter the superconductor.
Impurities in the superconductor can only cause Andreev reflection of these
quasiparticles and thus cannot degrade the current. At higher voltages, a state
of gapless superconductivity develops which is sensitive to the presence of
impurities.Comment: Latex file, 11 pages, 2 figures available upon request
[email protected], to be published in Journal of Physics: Condensed Matte
Model Independent Approach to Focus Point Supersymmetry: from Dark Matter to Collider Searches
The focus point region of supersymmetric models is compelling in that it
simultaneously features low fine-tuning, provides a decoupling solution to the
SUSY flavor and CP problems, suppresses proton decay rates and can accommodate
the WMAP measured cold dark matter (DM) relic density through a mixed
bino-higgsino dark matter particle. We present the focus point region in terms
of a weak scale parameterization, which allows for a relatively model
independent compilation of phenomenological constraints and prospects. We
present direct and indirect neutralino dark matter detection rates for two
different halo density profiles, and show that prospects for direct DM
detection and indirect detection via neutrino telescopes such as IceCube and
anti-deuteron searches by GAPS are especially promising. We also present LHC
reach prospects via gluino and squark cascade decay searches, and also via
clean trilepton signatures arising from chargino-neutralino production. Both
methods provide a reach out to m_{\tg}\sim 1.7 TeV. At a TeV-scale linear
e^+e^- collider (LC), the maximal reach is attained in the \tz_1\tz_2 or
\tz_1\tz_3 channels. In the DM allowed region of parameter space, a
\sqrt{s}=0.5 TeV LC has a reach which is comparable to that of the LHC.
However, the reach of a 1 TeV LC extends out to m_{\tg}\sim 3.5 TeV.Comment: 34 pages plus 36 eps figure
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