122,848 research outputs found
What are the consequences of global banking for the international transmission of shocks? A quantitative analysis
The global financial crisis of 2008 was followed by a wave of regulatory reforms that affected large banks, especially those with a global presence. These reforms were reactive to the crisis. In this paper we propose a structural model of global banking that can be used proactively to perform counterfactual analysis on the effects of alternative regulatory policies. The structure of the model mimics the US regulatory framework and highlights the organizational choices that banks face when entering a foreign market: branching versus subsidiarization. When calibrated to match moments from a sample of European banks, the model is able to replicate the response of the US banking sector to the European sovereign debt crisis. Our counterfactual analysis suggests that pervasive subsidiarization, higher capital requirements, or ad hoc monetary policy interventions would have mitigated the effects of the crisis on US lending.https://www.nber.org/papers/w25203Published versio
Two-loop corrections to Higgs boson production
In this paper we present the complete two-loop vertex corrections to scalar
and pseudo-scalar Higgs boson production for general colour factors for the
gauge group in the limit where the top quark mass gets infinite.
We derive a general formula for the vertex correction which holds for conserved
and non conserved operators. For the conserved operator we take the
electromagnetic vertex correction as an example whereas for the non conserved
operators we take the two vertex corrections above. Our observations for the
structure of the pole terms , and
in two loop order are the same as made earlier in the literature for
electromagnetism. However we also elucidate the origin of the second order
single pole term which is equal to the second order singular part of the
anomalous dimension plus a universal function which is the same for the quark
and the gluon. [3mm]Comment: 27 pages LaTeX.We correct some misprints. Moreover we have discovered
that the second order single pole term is equal to the singular part of the
second order anomalous dimension plus a universal function which is the same
for the quark and the gluon. This holds for vertex corrections as well as for
scattering amplitude
Nucleosynthesis and mixing on the Asymptotic Giant Branch. III. Predicted and observed s-process abundances
We present the results of s-process nucleosynthesis calculations for AGB
stars of different metallicities and initial masses. The computations were
based on previously published stellar evolutionary models that account for the
III dredge up phenomenon occurring late on the AGB. Neutron production is
driven by the 13C(alpha,n)16O reaction during the interpulse periods in a tiny
layer in radiative equilibrium at the top of the He- and C-rich shell. The
s-enriched material is subsequently mixed with the envelope by the III dredge
up, and the envelope composition is computed after each thermal pulse. We
follow the changes in the photospheric abundance of the Ba-peak elements (heavy
s, or `hs') and that of the Zr-peak ones (light s, or `ls'), whose logarithmic
ratio [hs/ls] has often been adopted as an indicator of the s-process
efficiency. The theoretical predictions are compared with published abundances
of s elements for Galactic AGB giants of classes MS, S, SC, post-AGB
supergiants, and for various classes of binary stars. The observations in
general confirm the complex dependence of n captures on metallicity. They
suggest that a moderate spread exists in the abundance of 13C that is burnt in
different stars. Although additional observations are needed, a good
understanding has been achieved of s-process operation in AGB. The detailed
abundance distribution including the light elements (CNO) of a few s-enriched
stars at different metallicity are examined.Comment: Accepted for ApJ, 59 pages, 19 figures, 5 table
Spectral statistics in disordered metals: a trajectories approach
We show that the perturbative expansion of the two-level correlation
function, , in disordered conductors can be understood
semiclassically in terms of self-intersecting particle trajectories. This
requires the extension of the standard diagonal approximation to include pairs
of paths which are non-identical but have almost identical action. The number
of diagrams thus produced is much smaller than in a standard field-theoretical
approach. We show that such a simplification occurs because has a
natural representation as the second derivative of free energy . We
calculate to 3-loop order, and verify a one-parameter scaling
hypothesis for it in 2d. We discuss the possibility of applying our ``weak
diagonal approximation'' to generic chaotic systems.Comment: 9 pages in REVTeX two-column format including 4 figures; submitted to
Phys.Rev.
Why will rat's go where rats will not
Experimental evidence indicates that regular plurals are nearly always omitted from English compounds (e.g., rats-eater) while irregular plurals may be included within these structures (e.g., mice-chaser). This phenomenon is considered to be good evidence to support the dual mechanism model of morphological processing (Pinker & Prince, 1992). However, evidence from neural net modelling has shown that a single route associative memory based account might provide an equally, if not more, valid explanation of the compounding phenomenon
Plural morphology in compounding is not good evidence to support the dual mechanism model
The compounding phenomena is considered to be good evidence to support the dual mechanism model of morphological processing (Pinker & Prince, 1992). However evidence from initial neural net modeling has shown that a single route associative memory based account might provide an equally, if not more valid explanation of the treatment of plurals in compounds. Further neural net modeling and empirical work is proposed to test this single route accoun
Evolution of damped Lyman alpha kinematics and the effect of spatial resolution on 21-cm measurements
We have investigated the effect of spatial resolution on determining
pencil-beam like velocity widths and column densities in galaxies. Three 21-cm
datasets are used, the HIPASS galaxy catalogue, a subset of HIPASS galaxies
with ATCA maps and a high-resolution image of the LMC. Velocity widths measured
from 21-cm emission in local galaxies are compared with those measured in
intermediate redshift Damped Lyman alpha (DLA) absorbers. We conclude that
spatial resolution has a severe effect on measuring pencil-beam like velocity
widths in galaxies. Spatial smoothing by a factor of 240 is shown to increase
the median velocity width by a factor of two. Thus any difference between
velocity widths measured from global profiles or low spatial resolution 21-cm
maps at z=0 and DLAs at z>1 cannot unambiguously be attributed to galaxy
evolution. The effect on column density measurements is less severe and the
values of dN/dz from local low-resolution 21-cm measurements are expected to be
overestimated by only ~10 per cent.Comment: 5 pages, 6 figures, accepted for publication in MNRAS letter
Line Emission in the Brightest Cluster Galaxies of the NOAO Fundamental Plane and Sloan Digital Sky Surveys
We examine the optical emission line properties of Brightest Cluster Galaxies
(BCGs) selected from two large, homogeneous datasets. The first is the X-ray
selected National Optical Astronomy Observatory Fundamental Plane Survey
(NFPS), and the second is the C4 catalogue of optically selected clusters built
from the Sloan Digital Sky Survey Data Release ~3 (SDSS DR3). Our goal is to
better understand the optical line emission in BCGs with respect to properties
of the galaxy and the host cluster. Throughout the analysis we compare the line
emission of the BCGs to that of a control sample made of the other bright
galaxies near the cluster centre. Overall, both the NFPS and SDSS show a modest
fraction of BCGs with emission lines (~15%). No trend in the fraction of
emitting BCGs as a function of galaxy mass or cluster velocity dispersion is
found. However we find that, for those BCGs found in cooling flow clusters,
71^{+9}_{-14}% have optical emission. Furthermore, if we consider only BCGs
within 50kpc of the X-ray centre of a cooling flow cluster, the emission-line
fraction rises further to 100^{+0}_{-15}%. Excluding the cooling flow clusters,
only ~10% of BCGs are line emitting, comparable to the control sample of
galaxies. We show that the physical origin of the emission line activity
varies: in some cases it has LINER-like line ratios, whereas in others it is a
composite of star-formation and LINER-like activity. We conclude that the
presence of emission lines in BCGs is directly related to the cooling of X-ray
gas at the cluster centre.Comment: Accepted for publication in MNRAS. 13 pages mn2e style with 7 figures
and 2 table
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