372,186 research outputs found
Generalized dilatation operator method for non-relativistic holography
We present a general algorithm for constructing the holographic dictionary
for Lifshitz and hyperscaling violating Lifshitz backgrounds for any value of
the dynamical exponent and any value of the hyperscaling violation
parameter compatible with the null energy condition. The objective of
the algorithm is the construction of the general asymptotic solution of the
radial Hamilton-Jacobi equation subject to the desired boundary conditions,
from which the full dictionary can be subsequently derived. Contrary to the
relativistic case, we find that a fully covariant construction of the
asymptotic solution for running non-relativistic theories necessitates an
expansion in the eigenfunctions of two commuting operators instead of one. This
provides a covariant but non-relativistic grading of the expansion, according
to the number of time derivatives.Comment: 6 pages; v2 references added, discussion of the algorithm and the
holographic dictionary improve
Grouping Synonyms by Definitions
We present a method for grouping the synonyms of a lemma according to its
dictionary senses. The senses are defined by a large machine readable
dictionary for French, the TLFi (Tr\'esor de la langue fran\c{c}aise
informatis\'e) and the synonyms are given by 5 synonym dictionaries (also for
French). To evaluate the proposed method, we manually constructed a gold
standard where for each (word, definition) pair and given the set of synonyms
defined for that word by the 5 synonym dictionaries, 4 lexicographers specified
the set of synonyms they judge adequate. While inter-annotator agreement ranges
on that task from 67% to at best 88% depending on the annotator pair and on the
synonym dictionary being considered, the automatic procedure we propose scores
a precision of 67% and a recall of 71%. The proposed method is compared with
related work namely, word sense disambiguation, synonym lexicon acquisition and
WordNet construction
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