16,395 research outputs found
New Financial Realities: The Response of Private Foundations
Reviews the causes of the 2008 financial crisis and its impact on private foundations, proposes a framework for analyzing the sector, offers lessons learned on endowment management, and examines the implications for spending plans and program strategies
Rethinking the Management of Foundation Endowments
Reviews the performance of foundation endowments since October 2007, lessons for investors, trends in endowment management models, and the strengths and weaknesses of five models. Recommends ways to make the most of investment consultants
Axion-Assisted Electroweak Baryogenesis
We consider a hidden-valley gauge sector, G, with strong coupling scale
Lambda~TeV and CP-violating topological parameter, theta, as well as a new
axion degree of freedom which adjusts theta to near zero in the current
universe. If the G-sector couples to the Standard Model via weak-scale states
charged under both, then in the early universe it is possible for the
CP-violation due to theta (which has not yet been adjusted to zero by the
hidden axion) to feed in to the SM and drive efficient baryogenesis during the
electroweak (EW) phase transition, independent of the effectively small amount
of CP violation present in the SM itself. While current constraints on both the
new axion and charged states are easily satisfied, we argue that the LHC can
investigate the vast majority of parameter space where EW-baryogenesis is
efficiently assisted, while the hidden axion should comprise a significant
fraction of the dark matter density. In the supersymmetric version, the
``messenger'' matter communicating between the SM- and G-sectors naturally
solves the little hierarchy problem of the MSSM. The connection of the hidden
scale and masses of the ``quirk''-like messengers to the EW scale via the
assisted electroweak baryogenesis mechanism provides a reason for such new
hidden valley physics to lie at the weak scale.Comment: 22+1 pages, 3 figure
Notions of Regularity for Functions of a Split-Quaternionic Variable
Notions of a "holomorphic" function theory for functions of a
split-quaternionic variable have been of recent interest. We describe two found
in the literature and show that one notion encompasses a small class of
functions, while the other gives a richer collection. In the second instance,
we describe a simple subclass of functions and give two examples of an analogue
of the Cauchy-Kowalewski extension in this context
Effectiveness of a Rigid Grate for Excluding Pacific Halibut, Hippoglossus stenolepis, From Groundfish Trawl Catches
A rigid grate was installed in a groundfish trawl to test its effectiveness in excluding Pacific halibut, Hippoglossus stenolepis, from commercial flatfish catches in the Gulf of Alaska. The grate was located ahead of the trawl codend to direct halibut toward an escape opening while allowing target species to pass through toward the codend. In an experimental fishery, the escape rate of halibut was estimated at 94%, while 72% of the Dover sole, Microstomas pacificus, 67% of the rex sole, Glyptocephalus zachirus, and 79% of the flathead sole, Hippoglossoides elassodon, were retained
Developments in the theory and practice of cognitive and behavioural therapies
In 1993 Behavioural and Cognitive Psychotherapy published a supplement edited by Ann Hackmann with the title “Behavioural and Cognitive Psychotherapies: Past History, Current Applications and Future Registration Issues”. This was the journal's first ever supplement and it provided an overview of the state of behavioural and cognitive psychotherapies at that time. It was intended to provide a context for discussions concerning the future of the field, and as Paul Salkovskis said in his editorial, “[the supplement]. . .will be an important reference source for years to come.
The Euler characteristic of the Whitehead automorphism group of a free product
A combinatorial summation identity over the lattice of labelled hypertrees is
established that allows one to gain concrete information on the Euler
characteristics of various automorphism groups of free products of groups.Comment: 19 pages, 3 figures, to appear in Trans. Amer. Math. So
The Goldstini Variations
We study the 'goldstini' scenario of Cheung, Nomura, and Thaler, in which
multiple independent supersymmetry (SUSY) breaking sectors lead to multiple
would-be goldstinos, changing collider and cosmological phenomenology. In
supergravity, potentially large corrections to the previous prediction of twice
the gravitino mass for goldstini masses can arise when their scalar partners
are stabilized far from the origin. Considerations arising from the complexity
of realistic string compactifications indicate that many of the independent
SUSY-breaking sectors should be conformally sequestered or situated in warped
Randall-Sundrum-like throats, further changing the predicted goldstini masses.
If the sequestered hidden sector is a metastable SUSY-breaking sector of the
Intriligator-Seiberg-Shih (ISS) type then multiple goldstini can originate from
within a single sector, along with many supplementary 'modulini', all with
masses of order twice the gravitino mass. These fields can couple to the
Supersymmetric Standard Model (SSM) via the 'Goldstino Portal'. Collider
signatures involving SSM sparticle decays can provide strong evidence for
warped-or-conformally-sequestered sectors, and of the ISS mechanism of SUSY
breaking. Along with axions and photini, the Goldstino Portal gives another
potential window to the hidden sectors of string theory.Comment: 30 pages, 3 figures; v2 minor changes, references adde
Classical electron mass and fields 2
Continued here is the development of a model of the electron (HYDRA), which includes rotational and magnetic terms. The atomic electron state is discussed and a comparison is made with a simple harmonic oscillator. Experimental data is reviewed that supports the possibility of a new lepton
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