pinecone/core-2020-05-10-deduplication huggingface dataset:
Research data meets research information management : two case studies using (a) Pure CERIF-CRIS and (b) EPrints repository platform with CERIF extensions

We would like to thank Jisc who supporting this work [grant number DIINNAA].This paper will describe how two research-intensive universities in the UK, St Andrews and Glasgow, have worked together over several years and projects to develop their institutional research management systems to deliver services to support the rapidly evolving needs of funders, institutional policy makers and management, and, importantly, the researchers themselves. This challenge is particularly acute at the moment with ‘Open Science’ one of the hottest topics around with organisations and funders from the G81 downwards stressing the importance of open data in driving everything from global innovation through to more accountable governance; not to mention the more direct possibility that non-compliance could result in research grant income drying up. There is a need to work with those researchers that need support to develop research data management processes and infrastructures that complement their ways of working and not just impose box-ticking exercises. We will explain the strategies, systems developed, and concerns arising to date at our two Universities to help support researchers and managers in this (r)evolution.Publisher PDFPeer reviewe
Systemic losses due to counterparty risk in a stylized banking system

We report a study of a stylized banking cascade model investigating systemic risk caused by counterparty failure using liabilities and assets to define banks' balance sheet. In our stylized system, banks can be in two states: normally operating or distressed and the state of a bank changes from normally operating to distressed whenever its liabilities are larger than the banks' assets. The banks are connected through an interbank lending network and, whenever a bank is distressed, its creditor cannot expect the loan from the distressed bank to be repaid, potentially becoming distressed themselves. We solve the problem analytically for a homogeneous system and test the robustness and generality of the results with simulations of more complex systems. We investigate the parameter space and the corresponding distribution of operating banks mapping the conditions under which the whole system is stable or unstable. This allows us to determine how financial stability of a banking system is influenced by regulatory decisions, such as leverage; we discuss the effect of central bank actions, such as quantitative easing and we determine the cost of rescuing a distressed banking system using re-capitalisation. Finally, we estimate the stability of the UK and US banking systems comparing the years 2007 and 2012 by using real data
Measuring galaxy segregation using the mark connection function

(abridged) The clustering properties of galaxies belonging to different
luminosity ranges or having different morphological types are different. These
characteristics or `marks' permit to understand the galaxy catalogs that carry
all this information as realizations of marked point processes. Many attempts
have been presented to quantify the dependence of the clustering of galaxies on
their inner properties. The present paper summarizes methods on spatial marked
statistics used in cosmology to disentangle luminosity, colour or morphological
segregation and introduces a new one in this context, the mark connection
function. The methods used here are the partial correlation functions,
including the cross-correlation function, the normalised mark correlation
function, the mark variogram and the mark connection function. All these
methods are applied to a volume-limited sample drawn from the 2dFGRS, using the
spectral type as the mark. We show the virtues of each method to provide
information about the clustering properties of each population, the dependence
of the clustering on the marks, the similarity of the marks as a function of
the pair distances, and the way to characterise the spatial correlation between
the marks. We demonstrate by means of these statistics that passive galaxies
exhibit stronger spatial correlation than active galaxies at small scales (r
<20 Mpc/h). The mark connection function, introduced here, is particularly
useful for understanding the spatial correlation between the marks.Comment: 6 pages, 5 figures, accepted for publication in Astronomy and
  Astrophysic
The Herschel Virgo Cluster Survey: VI. The far-infrared view of M87

The origin of the far-infrared emission from the nearby radio galaxy M87
remains a matter of debate. Some studies find evidence of a far-infrared excess
due to thermal dust emission, whereas others propose that the far-infrared
emission can be explained by synchrotron emission without the need for an
additional dust emission component. We present Herschel PACS and SPIRE
observations of M87, taken as part of the science demonstration phase
observations of the Herschel Virgo Cluster Survey. We compare these data with a
synchrotron model based on mid-infrared, far-infrared, submm and radio data
from the literature to investigate the origin of the far-infrared emission.
Both the integrated SED and the Herschel surface brightness maps are adequately
explained by synchrotron emission. At odds with previous claims, we find no
evidence of a diffuse dust component in M87, which is not unexpected in the
harsh X-ray environment of this radio galaxy sitting at the core of the Virgo
Cluster.Comment: Letter accepted for publication in A&A (Herschel special issue
m_pi and N_c dependence of resonances from Unitarized Chiral
  Perturbation Theory

We review our studies on the rho and sigma resonances properties derived from
the Inverse Amplitude Method. In particular, we study the leading $1/N_c$
behavior of the resonances masses and widths and their evolution with changing
$m_\pi$. The $1/N_c$ expansion gives a clear definition of $\bar qq$ states,
which is neatly satisfied by the $\rho$ but not by the sigma, showing that its
dominant component is not $\bar qq$. The $m_\pi$ dependence of the resonance
properties is relevant to connect with lattice studies. We show that our
predictions compare well with some lattice results and we find that the
rho-pi-pi coupling constant is $m_\pi$ independent, in contrast with the
sigma-pi-pi$ coupling, that shows a strong $m_\pi$ dependence.Comment: Invited talk at the 12th International Conference on Meson-Nucleon
  Physics and the Structure of the Nucleon (MENU2010), May 31-June 4, 2010,
  Williamsburg, Virginia. Added reference
Variations in the broadband spectra of BL Lac objects: millimetre
  observations of an X-ray-selected sample

Observations at millimetre wavelengths are presented for a representative
sample of 22 X-ray-selected BL Lac objects (XBLs). This sample comprises 19
High-energy cutoff BL Lacs objects (HBLs), 1 Low-energy cutoff BL Lac object
(LBL) and 2 `intermediate' sources. Data for LBLs, which are mostly radio
selected BL Lac objects (RBLs) are taken from the literature. It is shown that
the radio--millimetre spectral indices ($\alpha_{5-230)$) of HBLs
($-0.29\pm0.15$) are slightly steeper than those of the LBLs ($-0.19\pm0.14$).
A correlation exists between $\alpha_{5-230}$ and 230 GHz luminosity. While
this correlation could be an artefact of comparing two populations of BL Lac
objects with intrinsically different radio properties it is also consistent
with the predictions of existing unified schemes which relate BL Lac objects to
Fanaroff- Riley class I radio galaxies. The HBLs have significantly flatter
submillimetre- X-ray spectral indices ($\alpha_{230-X}$) than the LBLs
($-0.68\pm0.07$ cf. $-1.08\pm0.06$)although the two intermediate sources also
have intermediate values of $\alpha_{230-X}\sim-0.9$. It is argued that this
difference cannot be explained entirely by the viewing angle hypothesis and
requires a difference in physical source parameters. The $\alpha_{230-X}$
values for the HBLs are close to the canonical value found for large samples of
radio sources and thus suggest that synchrotron radiation is the mechanism that
produces the X-ray emission. As suggested by Padovani & Giommi, the
inverse-Compton mechanism is likely to dominate in the LBLs requiring the
synchrotron spectra of these sources to steepen or cutoff at lower frequencies
than those of the HBLs.Comment: 10 pages with figures, in press with MNRA
Pairs of SAT Assignment in Random Boolean Formulae

We investigate geometrical properties of the random K-satisfiability problem
using the notion of x-satisfiability: a formula is x-satisfiable if there exist
two SAT assignments differing in Nx variables. We show the existence of a sharp
threshold for this property as a function of the clause density. For large
enough K, we prove that there exists a region of clause density, below the
satisfiability threshold, where the landscape of Hamming distances between SAT
assignments experiences a gap: pairs of SAT-assignments exist at small x, and
around x=1/2, but they donot exist at intermediate values of x. This result is
consistent with the clustering scenario which is at the heart of the recent
heuristic analysis of satisfiability using statistical physics analysis (the
cavity method), and its algorithmic counterpart (the survey propagation
algorithm). The method uses elementary probabilistic arguments (first and
second moment methods), and might be useful in other problems of computational
and physical interest where similar phenomena appear
A precise determination of the decay constant of the Ds-meson in
  quenched QCD

We present a lattice determination of the leptonic decay constant F_Ds of the
Ds-meson using its mass and F_K as experimental input. Setting the scale with
F_K=160 MeV, our final result is F_Ds = 252(9) MeV. The error contains all
uncertainties apart from the quenched approximation. Setting the scale with the
nucleon mass instead leads to an increase of 3(1) MeV of the leptonic decay
constant which might indicate a small quenching error.Comment: 8 pages, 1 figure, references added, mistake in the computation of
  the quenched scale ambiguity of the decay constant correcte
Pion Structure Function $F_{2}^{\pi}$ in the Valon Model

Partonic structure of constituent quark (or{\it{valon}}) in the
Next-to-Leading Order is used to calculate pion structure function. This is a
further demonstration of the finding that the constituent quark structure is
universal, and once it is calculated, the Structure of any hadron can be
predicted thereafter, using a convolution method, without introducing any new
free parameter. The results are compared with the pion structure function from
ZEUS Coll. Leading Neutron Production in $e^{+}p$ collisions at HERA. We found
good agreement with the experiment. A resolution for the issue of normalization
of the experimental data is suggested. In addition, the proportionality of
$F_{2}^{\pi}$ and $F_{2}^{p}$, which have caused confusion in the normalization
of ZEUS data is discussed and resolved.Comment: 5 pages and 8 figures. Accepted for publication in Phys. Lett.
Measurement of the D+/- production asymmetry in 7 TeV pp collisions

The asymmetry in the production cross-section \sigma of D+/- mesons, A_P =
(\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of
pseudorapidity \eta and transverse momentum p_T within the acceptance of the
LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays
corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp
collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider.
When integrated over the kinematic range 2.0 < p_T < 18.0 GeV/c and 2.20 < \eta
< 4.75, the production asymmetry is A_P = (-0.96+/-0.26+/-0.18)%. The
uncertainties quoted are statistical and systematic, respectively. The result
assumes that any direct CP violation in the D+ -> K_S pi+ decay is negligible.
No significant dependence on \eta or p_T is observed.Comment: 12 pages, 5 figure
Local Group timing in Milgromian dynamics. A past Milky Way-Andromeda
  encounter at z>0.8

The Local Group timing has been one of the first historical probes of the
missing mass problem. Whilst modern cosmological probes indicate that pure
baryonic dynamics is not sufficient on the largest scales, nearby galaxies and
small galaxy groups persistently obey Milgrom's MOND law, which implies that
dynamics at small scales is possibly entirely predicted by the baryons. Here,
we investigate the Local Group timing in this context of Milgromian dynamics.
Making use of the latest measured proper motions and radial velocities for
Andromeda and the Magellanic clouds, we integrate backwards their orbits by
making use of the Milgromian two-body equation of motion. We find that, with
the currently measured proper motions and radial velocity of M31, MOND would
imply that the Milky Way and M31 first moved apart via Hubble expansion after
birth, but then necessarily got attracted again by the Milgromian gravitational
attraction, and had a past fly-by encounter before coming to their present
positions. This encounter would most probably have happened 7 to 11 Gyr ago
(0.8<z<3). The absence of a dark matter halo and its associated dynamical
friction is necessary for such a close encounter not to trigger a merger.
Observational arguments which could exclude or favour such a past encounter
would thus be very important in view of falsifying or vindicating Milgromian
dynamics on the scale of the Local Group. Interestingly, the closest approach
of the encounter is small enough (<55 kpc) to have severe consequences on the
disk dynamics, including perhaps thick disk formation, and on the satellite
systems of both galaxies. The ages of the satellite galaxies and of the young
halo globular clusters, all of which form the vast polar structure around the
Milky Way, are consistent with these objects having been born in this
encounter.Comment: 5 pages, 2 figures, accepted for publication in Astronomy and
  Astrophysic
$Z_N$ twisted orbifold models with magnetic flux

We propose new backgrounds of extra dimensions to lead to four-dimensional
chiral models with three generations of matter fermions, that is $T^2/Z_N$
twisted orbifolds with magnetic fluxes. We consider gauge theory on
six-dimensional space-time, which contains the $T^2/Z_N$ orbifold with magnetic
flux, Scherk-Schwarz phases and Wilson line phases. We classify all the
possible Scherk-Schwarz and Wilson line phases on $T^2/Z_N$ orbifolds with
magnetic fluxes. The behavior of zero modes is studied. We derive the number of
zero modes for each eigenvalue of the $Z_N$ twist, showing explicitly examples
of wave functions. We also investigate Kaluza-Klein mode functions and mass
spectra.Comment: 34 pages, 4 figure
Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates

We carry out a systematic exploration of the effect of pre-impact rotation on
the outcomes of low-speed collisions between planetesimals modeled as
gravitational aggregates. We use pkdgrav, a cosmology code adapted to
collisional problems and recently enhanced with a new soft-sphere collision
algorithm that includes more realistic contact forces. A rotating body has
lower effective surface gravity than a non-rotating one and therefore might
suffer more mass loss as the result of a collision. What is less well
understood, however, is whether rotation systematically increases mass loss on
average regardless of the impact trajectory. This has important implications
for the efficiency of planet formation via planetesimal growth, and also more
generally for the determination of the impact energy threshold for catastrophic
disruption (leading to the largest remnant retaining 50% of the original mass),
as this has generally only been evaluated for non-spinning bodies. We find that
for most collision scenarios, rotation lowers the threshold energy for
catastrophic dispersal. For head-on collisions, we develop a semi-analytic
description of the change in the threshold description as a function of the
target's pre-impact rotation rate, and find that these results are consistent
with the "universal law" of catastrophic disruption developed by Leinhardt &
Stewart. Using this approach, we introduce re-scaled catastrophic disruption
variables that take into account the interacting mass fraction of the target
and the projectile in order to translate oblique impacts into equivalent
head-on collisions.Comment: 13 pages, 11 figures, 2 tables, Accepted for publication in
  Astrophysical Journa
Unbroken B-L Symmetry

The difference between baryon number B and lepton number L is the only
anomaly-free global symmetry of the Standard Model, easily promoted to a local
symmetry by introducing three right-handed neutrinos, which automatically make
neutrinos massive. The non-observation of any (B-L)-violating processes leads
us to scrutinize the case of unbroken gauged B-L; besides Dirac neutrinos, the
model contains only three parameters, the gauge coupling strength g', the
Stueckelberg mass $M_{Z'}$, and the kinetic mixing angle $\chi$. The new force
could manifest itself at any scale, and we collect and derive bounds on g' over
the entire testable range $M_{Z'}$ = 0 - $10^{13}$ eV, also of interest for the
more popular case of spontaneously broken B-L or other new light forces. We
show in particular that successful Big Bang nucleosynthesis provides strong
bounds for masses 10 eV < $M_{Z'}$ < 10 GeV due to resonant enhancement of the
rate $\bar{f} f \leftrightarrow \bar{\nu}_R \nu_R$. The strongest limits
typically arise from astrophysics and colliders, probing scales $M_{Z'}/g'$
from TeV up to $10^{10}$ GeV.Comment: 8 pages, 3 figures; added reference, matches published versio
Near-Hagedorn Thermodynamics and Random Walks - Extensions and Examples

In this paper, we discuss several explicit examples of the results obtained
in JHEP 1402 (2014) 127. We elaborate on the random walk picture in these
spacetimes and how it is modified. Firstly we discuss the linear dilaton
background. Then we analyze a previously studied toroidally compactified
background where we determine the Hagedorn temperature and study the random
walk picture. We continue with flat space orbifold models where we discuss
boundary conditions for the thermal scalar. Finally, we study the general link
between the quantum numbers in the fundamental domain and the strip and their
role in thermodynamics.Comment: 34 pages, v2: matches published versio
Extended M{\o}ller-Plesset perturbation theory for dynamical and static
  correlations

We present a novel method that appropriately handles both dynamical and
static electron correlation in a balanced manner, using a perturbation theory
on a spin-extended Hartree-Fock (EHF) wave function reference. While EHF is a
suitable candidate for degenerate systems where static correlation is
ubiquitous, it is known that most of dynamical correlation is neglected in EHF.
In this work, we derive a perturbative correction to a fully spin-projected
self-consistent wave function based on second-order M{\o}ller-Plesset
perturbation theory (MP2). The proposed method efficiently captures the ability
of EHF to describe static correlation in degeneracy, combined with MP2's
ability to treat dynamical correlation effects. We demonstrate drastic
improvements on molecular ground state and excited state potential energy
curves and singlet-triplet splitting energies over both EHF and MP2 with
similar computational effort to the latter.Comment: 5 pages, 3 figures, 2 table
New spin Calogero-Sutherland models related to B_N-type Dunkl operators

We construct several new families of exactly and quasi-exactly solvable
BC_N-type Calogero-Sutherland models with internal degrees of freedom. Our
approach is based on the introduction of two new families of Dunkl operators of
B_N type which, together with the original B_N-type Dunkl operators, are shown
to preserve certain polynomial subspaces of finite dimension. We prove that a
wide class of quadratic combinations involving these three sets of Dunkl
operators always yields a spin Calogero-Sutherland model, which is
(quasi-)exactly solvable by construction. We show that all the spin
Calogero-Sutherland models obtainable within this framework can be expressed in
a unified way in terms of a Weierstrass P function with suitable half-periods.
This provides a natural spin counterpart of the well-known general formula for
a scalar completely integrable potential of BC_N type due to Olshanetsky and
Perelomov. As an illustration of our method, we exactly compute several energy
levels and their corresponding wavefunctions of an elliptic quasi-exactly
solvable potential for two and three particles of spin 1/2.Comment: 18 pages, typeset in LaTeX 2e using revtex 4.0b5 and the amslatex
  package Minor changes in content, one reference adde
Spin alignment of leading $K^{*}(892)^{0}$ mesons in hadronic $Z^0$ decays

Helicity density matrix elements for inclusive K*(892)^0 mesons from hadronic Z^0 decays have been measured over the full range of K^*0 momentum using data taken with the OPAL experiment at LEP. A preference for occupation of the helicity zero state is observed at all scaled momentum x_p values above 0.3, with the matrix element rho_00 rising to 0.66 +/- 0.11 for x_p > 0.7. The values of the real part of the off-diagonal element rho_1-1 are negative at large x_p, with a weighted average value of -0.09 +/- 0.03 for x_p > 0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the qq(bar) system from the Z^0 decay. All other helicity density matrix elements measured are consistent with zero over the entire x_p range. The K^*0 fragmentation function has also been measured and the total rate determined to be 0.74 +/- 0.02 +/- 0.02 K*(892)^0 mesons per hadronic Z^0 decay.Helicity density matrix elements for inclusive K ∗ (892) 0 mesons from hadronic Z 0 decays have been measured over the full range of K ∗ 0 momentum using data taken with the OPAL experiment at LEP. A preference for occupation of the helicity zero state is observed at all scaled momentum x p values above 0.3, with the matrix element ϱ 00 rising to 0.66 ± 0.11 for x p > 0.7. The values of the real part of the off-diagonal element ϱ 1 - 1 are negative at large x p , with a weighted average value of −0.09 ± 0.03 for x p > 0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the q q system from the Z 0 decay. All other helicity density matrix elements measured are consistent with zero over the entire x p range. The K ∗ 0 fragmentation function has also been measured and the total rate determined to be 0.74 ± 0.02 ± 0.02 K ∗ (892) 0 mesons per hadronic Z 0 decay
Search for heavy Majorana neutrinos in mu+/- mu+/- + jets events in
  proton-proton collisions at sqrt(s) = 8 TeV

A search is performed for heavy Majorana neutrinos (N) using an event
signature defined by two muons of the same charge and two jets (mu+/- mu+/-
jj). The data correspond to an integrated luminosity of 19.7 inverse femtobarns
of proton-proton collisions at a center-of-mass energy of 8 TeV, collected with
the CMS detector at the CERN LHC. No excess of events is observed beyond the
expected standard model background and upper limits are set on abs(V[mu,N])^2
as a function of Majorana neutrino mass m[N] for masses in the range of 40-500
GeV, where V[mu,N] is the mixing element of the heavy neutrino with the
standard model muon neutrino. The limits obtained are abs(V[mu,N])^2 < 0.00470
for m[N] = 90 GeV, abs(V[mu,N])^2 < 0.0123 for m[N] = 200 GeV, and
abs(V[mu,N])^2 < 0.583 for m[N] = 500 GeV. These results extend considerably
the regions excluded by previous direct searches.Comment: Submitted to Phys. Lett. B; published versio