7,194 research outputs found
Confrontation Cinema in the Age of Neoliberalism; Where Brazil and the United States Meet
Contents: Introduction; The Smell of Revolution and Popcorn; Filling the Gaps: Historical Context; Brazilian Cinema in the Age of Neoliberalism and Political Discourse of the New Brazilian Left; US Films and the Iraq War: This isn’t my America; Epilogu
Bank capital structure, regulatory capital, and securities innovations
Although financial instruments that, in effect, permit corporations to treat preferred stock dividends as tax-deductible interest have been used by nonfinancial corporations since late 1993, bank holding companies (BHCs) did not issue these trust-preferred securities (TPS) until 1996, when the Federal Reserve qualified them as Tier-1 capital. We delineate and test hypotheses with 1) analyses of the stock-market reaction to the Fed’s ruling and to TPS filings and 2) comparisons of BHCs that issued TPS with those that did not. We conclude that regulatory capital requirements, tax savings, and uninsured sources of funds can have significant positive effects on BHCs’ demand for capital; growth and investment opportunities have an inconclusive effect; and transaction costs have a negative effect. Our results are not consistent with the moral-hazard hypothesis.Bank capital ; Bank holding companies ; Bank supervision ; Securities
Constraints on a scalar-pseudoscalar Higgs mixing at future e+e- colliders: an update
We perform an update of our previous analysis on the constraints on possible
deviations of Hbb coupling from its Standard Model value, arising from a
scalar-pseudoscalar mixing. In this paper we include a complete simulation of
the process e+ e- -> b bbar e+ e- and combine it with our previous results to
obtain tighter bounds on the deviations of the parameters describing this
coupling that could be measured at the Next Linear Collider.Comment: 3 pages, 2 figures, to be submitted to Phys. Rev.
Three Jet Events and New Strong Couplings at LEP and NLC
We study the effects of new dimension--6 operators, resulting from a general
invariant effective Lagrangian, on
three jet production at LEP and at the Next Linear Collider. Contributions to
the total event rate and to some event shape variables are analysed in order to
establish bounds on these operators.Comment: 5 pages, LaTeX, 1 Figur
The coupled cluster method applied to the spin-half <i>XXZ</i> model on the honeycomb lattice
Phase behaviour of additive binary mixtures in the limit of infinite asymmetry
We provide an exact mapping between the density functional of a binary
mixture and that of the effective one-component fluid in the limit of infinite
asymmetry. The fluid of parallel hard cubes is thus mapped onto that of
parallel adhesive hard cubes. Its phase behaviour reveals that demixing of a
very asymmetric mixture can only occur between a solvent-rich fluid and a
permeated large particle solid or between two large particle solids with
different packing fractions. Comparing with hard spheres mixtures we conclude
that the phase behaviour of very asymmetric hard-particle mixtures can be
determined from that of the large component interacting via an adhesive-like
potential.Comment: Full rewriting of the paper (also new title). 4 pages, LaTeX, uses
revtex, multicol, epsfig, and amstex style files, to appear in Phys. Rev. E
(Rapid Comm.
A new approach to the inverse problem for current mapping in thin-film superconductors
A novel mathematical approach has been developed to complete the inversion of
the Biot-Savart law in one- and two-dimensional cases from measurements of the
perpendicular component of the magnetic field using the well-developed
Magneto-Optical Imaging technique. Our approach, especially in the 2D case, is
provided in great detail to allow a straightforward implementation as opposed
to those found in the literature. Our new approach also refines our previous
results for the 1D case [Johansen et al., Phys. Rev. B 54, 16264 (1996)], and
streamlines the method developed by Jooss et al. [Physica C 299, 215 (1998)]
deemed as the most accurate if compared to that of Roth et al. [J. Appl. Phys.
65, 361 (1989)]. We also verify and streamline the iterative technique, which
was developed following Laviano et al. [Supercond. Sci. Technol. 16, 71 (2002)]
to account for in-plane magnetic fields caused by the bending of the applied
magnetic field due to the demagnetising effect. After testing on
magneto-optical images of a high quality YBa2Cu3O7 superconducting thin film,
we show that the procedure employed is effective
Can neutrino-assisted early dark energy models ameliorate the tension in a natural way?
The idea of neutrino-assisted early dark energy (EDE), where a coupling
between neutrinos and the scalar field that models early dark energy (EDE) is
considered, was introduced with the aim of reducing some of the fine-tuning and
coincidence problems that appear in usual EDE models. In order to be relevant
in ameliorating the tension, the contribution of EDE to the total energy
density () should be around 10\% near the redshift of
matter-radiation equality. We verify under which conditions EDE models can
fulfill these requirements for a model with a quartic self-coupling of the EDE
field and an exponential coupling to neutrinos. We find that in the situation
where the EDE field is frozen initially, the contribution to can
be significant but it is not sensitive to the neutrino-EDE coupling and does
not address the EDE coincidence problem. On the other hand, if the EDE field
starts already dynamical at the minimum of the effective potential, it tracks
this time-dependent minimum that presents a feature triggered by the neutrino
transition from relativistic to nonrelativistic particles. This feature
generates in a natural way at around this transition epoch, that
roughly coincides with the matter-radiation equality redshift. For the set of
parameters that we considered we did not find values that satisfy the
requirements on the background cosmological evolution to mitigate the Hubble
tension in a natural way in this particular EDE model.Comment: 6 pages, 4 figures. New version with more detailed analysi
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