27,473 research outputs found
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The effectiveness of banking supervision
Banking supervision is an essential aspect of modern financial systems, seeking crucially to monitor risk-taking by banks so as to protect depositors, the government safety net and the economy as a whole against systemic bank failure and its consequences. In this context, this paper seeks to explore the relationship between risk indicators for individual banks and the different approaches to banking supervision adopted around the world. This is the first work to make use of the currently available
cross section series data on bank supervision from the World Bank to carry out empirical investigations in a panel data framework, gaining all the advantages in increased efficiency and information that comes from estimations combining longer time series and a wide range of countries. We find wide-ranging effects of design features of banking supervision on risk taking which raise important policy issues
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Deposit insurance systems and bank risk
The link from deposit insurance to bank risk taking has been widely analysed, but has been the subject of relatively little empirical work. This work contributes to the existing literature by exploring microeconomic aspects of the deposit insuranceâbank risk relationship. It employs four of the five IMF core financial soundness indicators, using data from financial statements for 914 banks in 64 countries. It also disaggregates deposit insurance by individual design features. Results, generated using GMM, suggest that deposit insurance mainly affects bank risk through its relationship with profitability and asset quality. An optimal deposit insurance system might have features such as voluntary membership, no cover for foreign currency deposits, no coinsurance, be unfunded, and administered by a private sector manager with the insurance cost borne fully by the private sector
Vortex in a relativistic perfect isentropic fluid and Nambu Goto dynamics
By a weak deformation of the cylindrical symmetry of the potential vortex in
a relativistic perfect isentropic fluid, we study the possible dynamics of the
central line of this vortex. In "stiff" material the Nanbu-Goto equations are
obtainedComment: 11 pages, Accepted for publication in Physical Review
A comprehensive population synthesis study of post-common envelope binaries
We apply population synthesis techniques to calculate the present day
population of post-common envelope binaries (PCEBs) for a range of theoretical
models describing the common envelope (CE) phase. Adopting the canonical energy
budget approach we consider models where the ejection efficiency,
\alpha_{\rmn{CE}} is either a constant, or a function of the secondary mass.
We obtain the envelope binding energy from detailed stellar models of the
progenitor primary, with and without the thermal and ionization energy, but we
also test a commonly used analytical scaling. We also employ the alternative
angular momentum budget approach, known as the -algorithm. We find that
a constant, global value of \alpha_{\rmn{CE}} \ga 0.1 can adequately account
for the observed population of PCEBs with late spectral-type secondaries.
However, this prescription fails to reproduce IK Pegasi, which has a secondary
with spectral type A8. We can account for IK Pegasi if we include thermal and
ionization energy of the giant's envelope, or if we use the -algorithm.
However, the -algorithm predicts local space densities that are 1 to 2
orders of magnitude greater than estimates from observations. In contrast, the
canonical energy budget prescription with an initial mass ratio distribution
that favours unequal initial mass ratios gives a local space density which is
in good agreement with observations, and best reproduces the observed
distribution of PCEBs. Finally, all models fail to reproduce the sharp decline
for orbital periods, P_{\rmn{orb}} \ga 1 d in the orbital period distribution
of observed PCEBs, even if we take into account selection effects against
systems with long orbital periods and early spectral-type secondaries.Comment: Accepted for publication in the Monthly Notices of the Royal
Astronomical Society. 18 pages, 10 figures. Work concerning the
reconstruction of the common envelope phase presented in the previous version
will now be submitted in a separate paper in the near futur
Light Neutralino Dark Matter in the NMSSM
Neutralino dark matter is generally assumed to be relatively heavy, with a
mass near the electroweak scale. This does not necessarily need to be the case,
however. In the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and other
supersymmetric models with an extended Higgs sector, a very light CP-odd Higgs
boson can naturally arise making it possible for a very light neutralino to
annihilate efficiently enough to avoid being overproduced in the early
Universe.
In this article, we explore the characteristics of a supersymmetric model
needed to include a very light neutralino, 100 MeV < \mcnone < 20 GeV, using
the NMSSM as a prototype. We discuss the most important constraints from
Upsilon decays, , and the magnetic moment
of the muon, and find that a light bino or singlino neutralino is allowed, and
can be generated with the appropriate relic density.
It has previously been shown that the positive detection of dark matter
claimed by the DAMA collaboration can be reconciled with other direct dark
matter experiments such as CDMS II if the dark matter particle is rather light,
between about 6 and 9 GeV. A singlino or bino-like neutralino could easily fall
within this range of masses within the NMSSM. Additionally, models with sub-GeV
neutralinos may be capable of generating the 511 keV gamma-ray emission
observed from the galactic bulge by the INTEGRAL/SPI experiment.
We also point out measurements which can be performed immediately at CLEO,
BaBar and Belle using existing data to discover or significantly constrain this
scenario.Comment: References updated, accepted for publication in PR
Two-dimensional symmetric and antisymmetric generalizations of exponential and cosine functions
Properties of the four families of recently introduced special functions of
two real variables, denoted here by , and , are studied. The
superscripts and refer to the symmetric and antisymmetric functions
respectively. The functions are considered in all details required for their
exploitation in Fourier expansions of digital data, sampled on square grids of
any density and for general position of the grid in the real plane relative to
the lattice defined by the underlying group theory. Quality of continuous
interpolation, resulting from the discrete expansions, is studied, exemplified
and compared for some model functions.Comment: 22 pages, 10 figure
Non existence of a phase transition for the Penetrable Square Wells in one dimension
Penetrable Square Wells in one dimension were introduced for the first time
in [A. Santos et. al., Phys. Rev. E, 77, 051206 (2008)] as a paradigm for
ultra-soft colloids. Using the Kastner, Schreiber, and Schnetz theorem [M.
Kastner, Rev. Mod. Phys., 80, 167 (2008)] we give strong evidence for the
absence of any phase transition for this model. The argument can be generalized
to a large class of model fluids and complements the van Hove's theorem.Comment: 14 pages, 7 figures, 1 tabl
Alien Registration- Davis, Walter U. (Bath, Sagadahoc County)
https://digitalmaine.com/alien_docs/9507/thumbnail.jp
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