22 research outputs found
A universal correction to higher spin entanglement entropy
We consider conformal field theories in 1+1 dimensions with W-algebra
symmetries, deformed by a chemical potential \mu for the spin-three current. We
show that the order \mu^2 correction to the Re'nyi and entanglement entropies
of a single interval in the deformed theory, on the infinite spatial line and
at finite temperature, is universal. The correction is completely determined by
the operator product expansion of two spin-three currents, and by the
expectation values of the stress tensor, its descendants and its composites,
evaluated on the n-sheeted Riemann surface branched along the interval. This
explains the recently found agreement of the order \mu^2 correction across
distinct free field CFTs and higher spin black hole solutions holographically
dual to CFTs with W-symmetry.Comment: Version accepted for publication as Rapid Communications in Phys.
Rev. D. Included an expanded discussion of the prescription used for contact
terms in relevant integrals; typos correcte
GTB – An Online Genome Tolerance Browser
BACKGROUND: Accurate methods capable of predicting the impact of single nucleotide variants (SNVs) are assuming ever increasing importance. There exists a plethora of in silico algorithms designed to help identify and prioritize SNVs across the human genome for further investigation. However, no tool exists to visualize the predicted tolerance of the genome to mutation, or the similarities between these methods. RESULTS: We present the Genome Tolerance Browser (GTB, http://gtb.biocompute.org.uk): an online genome browser for visualizing the predicted tolerance of the genome to mutation. The server summarizes several in silico prediction algorithms and conservation scores: including 13 genome-wide prediction algorithms and conservation scores, 12 non-synonymous prediction algorithms and four cancer-specific algorithms. CONCLUSION: The GTB enables users to visualize the similarities and differences between several prediction algorithms and to upload their own data as additional tracks; thereby facilitating the rapid identification of potential regions of interest. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s12859-016-1436-4) contains supplementary material, which is available to authorized users
An integrative approach to predicting the functional effects of small indels in non-coding regions of the human genome
Background: Small insertions and deletions (indels) have a significant influence in human disease and, in terms of
frequency, they are second only to single nucleotide variants as pathogenic mutations. As the majority of mutations
associated with complex traits are located outside the exome, it is crucial to investigate the potential pathogenic
impact of indels in non-coding regions of the human genome.
Results: We present FATHMM-indel, an integrative approach to predict the functional effect, pathogenic or neutral,
of indels in non-coding regions of the human genome. Our method exploits various genomic annotations in addition
to sequence data. When validated on benchmark data, FATHMM-indel significantly outperforms CADD and GAVIN,
state of the art models in assessing the pathogenic impact of non-coding variants. FATHMM-indel is available via a
web server at indels.biocompute.org.uk.
Conclusions: FATHMM-indel can accurately predict the functional impact and prioritise small indels throughout the
whole non-coding genome
Towards Deep Cellular Phenotyping in Placental Histology
The placenta is a complex organ, playing multiple roles during fetal
development. Very little is known about the association between placental
morphological abnormalities and fetal physiology. In this work, we present an
open sourced, computationally tractable deep learning pipeline to analyse
placenta histology at the level of the cell. By utilising two deep
Convolutional Neural Network architectures and transfer learning, we can
robustly localise and classify placental cells within five classes with an
accuracy of 89%. Furthermore, we learn deep embeddings encoding phenotypic
knowledge that is capable of both stratifying five distinct cell populations
and learn intraclass phenotypic variance. We envisage that the automation of
this pipeline to population scale studies of placenta histology has the
potential to improve our understanding of basic cellular placental biology and
its variations, particularly its role in predicting adverse birth outcomes.Comment: Updated MRC funding material. Corrected typo that suggested
ensembling and Inception accuracy were the same (updated to reflect the fact
the ensemble model is 1% better than previously reported
Asymptotic symmetries and thermodynamics of higher spin black holes inAdS3
We study black holes carrying higher spin charge in AdS3 within the framework
of SL(N, R) x SL(N, R) Chern-Simons theory. Focussing attention on the N=4
case, we explicitly analyze the asymptotic symmetry algebra of black hole
solutions with a chemical potential for spin-four charge. We demonstrate that
the background describes an RG flow between an IR fixed point with W_4 symmetry
and a UV fixed point with W-symmetry associated to a non-principal embedding of
sl(2) in sl(4). Matching Chern-Simons equations with Ward identities of the
deformed CFT, we show that the UV stress tensor is twisted by a certain U(1)
current, and the flow is triggered by an operator with dimension 4/3 at the UV
fixed point. We find independent confirmation of this picture via a consistent
formulation of thermodynamics with respect to this UV fixed point. We further
analyze the thermodynamics of multiple branches of black hole solutions for
N=4,5 and find that the BTZ-branch, dominant at low temperatures, ceases to
exist at higher temperatures following a merger with a thermodynamically
unstable branch. We also point out an interesting connection between the RG
flows and generalized KdV hierarchies.Comment: References added, version published in Phys. Rev