412,276 research outputs found
All scale-free networks are sparse
We study the realizability of scale free-networks with a given degree
sequence, showing that the fraction of realizable sequences undergoes two
first-order transitions at the values 0 and 2 of the power-law exponent. We
substantiate this finding by analytical reasoning and by a numerical method,
proposed here, based on extreme value arguments, which can be applied to any
given degree distribution. Our results reveal a fundamental reason why large
scale-free networks without constraints on minimum and maximum degree must be
sparse.Comment: 4 pages, 2 figure
Collecting Diverse Natural Language Inference Problems for Sentence Representation Evaluation
We present a large-scale collection of diverse natural language inference
(NLI) datasets that help provide insight into how well a sentence
representation captures distinct types of reasoning. The collection results
from recasting 13 existing datasets from 7 semantic phenomena into a common NLI
structure, resulting in over half a million labeled context-hypothesis pairs in
total. We refer to our collection as the DNC: Diverse Natural Language
Inference Collection. The DNC is available online at https://www.decomp.net,
and will grow over time as additional resources are recast and added from novel
sources.Comment: To be presented at EMNLP 2018. 15 page
Self-Completeness and the Generalized Uncertainty Principle
The generalized uncertainty principle discloses a self-complete
characteristic of gravity, namely the possibility of masking any curvature
singularity behind an event horizon as a result of matter compression at the
Planck scale. In this paper we extend the above reasoning in order to overcome
some current limitations to the framework, including the absence of a
consistent metric describing such Planck-scale black holes. We implement a
minimum-size black hole in terms of the extremal configuration of a neutral
non-rotating metric, which we derived by mimicking the effects of the
generalized uncertainty principle via a short scale modified version of
Einstein gravity. In such a way, we find a self-consistent scenario that
reconciles the self-complete character of gravity and the generalized
uncertainty principle.Comment: 20 pages, 6 figures, v2: additional references, version in press on
JHE
Effects of supersymmetric threshold corrections on the Yukawa matrix unification
We present an updated analysis of the Yukawa matrix unification within the
renormalizable Minimal Supersymmetric Standard Model. It is assumed that the
soft terms are non-universal but flavour-diagonal in the super-CKM basis at the
GUT scale. Trilinear Higgs-squark-squark A-terms can generate large threshold
corrections to the Yukawa matrix at the superpartner decoupling
scale. In effect, the SU(5) boundary condition
at the GUT scale can be satisfied. However, such large trilinear terms make the
usual Higgs vacuum metastable (though long-lived). We broaden previous studies
by including results from the first LHC phase, notably the measurement of the
Higgs particle mass, as well as a quantitative investigation of flavour
observables.Comment: 19 pages, 9 figures, 3 tables; journal version: updated numerical
results after finding a bug in the software, their meaning and reasoning in
the article remain the same; added scatter plots of scanned points; The
European Physical Journal C, Volume 75, Issue 2 (February 2015
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