6,928 research outputs found
Extracting, Transforming and Archiving Scientific Data
It is becoming common to archive research datasets that are not only large
but also numerous. In addition, their corresponding metadata and the software
required to analyse or display them need to be archived. Yet the manual
curation of research data can be difficult and expensive, particularly in very
large digital repositories, hence the importance of models and tools for
automating digital curation tasks. The automation of these tasks faces three
major challenges: (1) research data and data sources are highly heterogeneous,
(2) future research needs are difficult to anticipate, (3) data is hard to
index. To address these problems, we propose the Extract, Transform and Archive
(ETA) model for managing and mechanizing the curation of research data.
Specifically, we propose a scalable strategy for addressing the research-data
problem, ranging from the extraction of legacy data to its long-term storage.
We review some existing solutions and propose novel avenues of research.Comment: 8 pages, Fourth Workshop on Very Large Digital Libraries, 201
Generalized Flow-Box property for singular foliations
We introduce a notion of generalized Flow-Box property valid for general
singular distributions and sub-varieties (based on a dynamical interpretation).
Just as in the usual Flow-Box Theorem, we characterize geometrical and
algebraic conditions of (quasi) transversality in order for an analytic
sub-variety (not necessarily regular) to be a section of a line foliation.
We also discuss the case of more general foliations.
This study is originally motivated by a question of Jean-Francois Mattei
(concerning the strengthening of a Theorem of Mattei) about the existence of
local slices for a (non-compact) Lie group action.Comment: Changes in Section
Five--Branes and Supersymmetry Breaking in M--Theory
Supersymmetry breaking via gaugino condensation is studied in vacua of
heterotic M-theory with five-branes. We show that supersymmetry is still broken
by a global mechanism and that the non-perturbative superpotential takes the
standard form. When expressed in terms of low energy fields, a modification
arises due to a threshold correction in the gauge kinetic function that depends
on five-brane moduli. We also determine the form of the low energy matter field
Kahler potential. These results are used to discuss the soft supersymmetry
breaking parameters, in particular the question of universality.Comment: 28 pages, Late
Boundary Inflation
Inflationary solutions are constructed in a specific five-dimensional model
with boundaries motivated by heterotic M-theory. We concentrate on the case
where the vacuum energy is provided by potentials on those boundaries. It is
pointed out that the presence of such potentials necessarily excites bulk
Kaluza-Klein modes. We distinguish a linear and a non-linear regime for those
modes. In the linear regime, inflation can be discussed in an effective
four-dimensional theory in the conventional way. We lift a four-dimensional
inflating solution up to five dimensions where it represents an inflating
domain wall pair. This shows explicitly the inhomogeneity in the fifth
dimension. We also demonstrate the existence of inflating solutions with
unconventional properties in the non-linear regime. Specifically, we find
solutions with and without an horizon between the two boundaries. These
solutions have certain problems associated with the stability of the additional
dimension and the persistence of initial excitations of the Kaluza-Klein modes.Comment: 35 pages, Latex, one eps-figur
Variable Flavor Number Scheme for Final State Jets
We discuss a variable flavor number scheme (VFNS) for final state jets which
can account for the effects of arbitrary finite quark masses in inclusive jet
observables. The scheme is a generalization of the VFNS scheme for PDFs applied
to setups with additional dynamical scales and relies on appropriate
renormalization conditions for the matrix elements in the factorization
theorem. We illustrate general properties by means of the example of
deep-inelastic scattering (DIS) in the endpoint region and
event shapes in the dijet limit, in particular the calculations of threshold
corrections, consistency conditions and relations to mass singularities found
in fixed-order massive calculations.Comment: 7 pages, 4 figures, Proceedings of the XXII. International Workshop
on Deep-Inelastic Scattering and Related Subjects, 28 April - 2 May 2014,
Warsaw, Polan
Multi-Boson Interactions at the LHC
This review covers results on the production of all possible electroweak
boson pairs and 2-to-1 vector boson fusion at the CERN Large Hadron Collider
(LHC) in proton-proton collisions at a center of mass energy of 7 and 8 TeV.
The data were taken between 2010 and 2012. Limits on anomalous triple gauge
couplings (aTGCs) then follow. In addition, data on electroweak triple gauge
boson production and 2-to-2 vector boson scattering yield limits on anomalous
quartic gauge boson couplings (aQGCs). The LHC hosts two general purpose
experiments, ATLAS and CMS, which have both reported limits on aTGCs and aQGCs
which are herein summarized. The interpretation of these limits in terms of an
effective field theory is reviewed, and recommendations are made for testing
other types of new physics using multi-gauge boson production.Comment: 53 pages, 48 figures, 4 table
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