65,959 research outputs found
Chemical and thermal freeze-out of identified hadrons at the LHC
This proceeding briefly summarizes our recent VISHNU hybrid model
investigations on the chemical and thermal freeze-out of various hadrons
species in 2.76 A TeV Pb+Pb collisions. Detailed analysis on the evolution of
particle yields and the last elastic collisions distributions during the
hadronic evolution reveals that the two multi-strange hadrons, and
, experience early chemical and thermal freeze-out when compared with
other hadron species.Comment: 4 pages, 3 figures, SQM2015 proceedin
Bayesian Matrix Completion via Adaptive Relaxed Spectral Regularization
Bayesian matrix completion has been studied based on a low-rank matrix
factorization formulation with promising results. However, little work has been
done on Bayesian matrix completion based on the more direct spectral
regularization formulation. We fill this gap by presenting a novel Bayesian
matrix completion method based on spectral regularization. In order to
circumvent the difficulties of dealing with the orthonormality constraints of
singular vectors, we derive a new equivalent form with relaxed constraints,
which then leads us to design an adaptive version of spectral regularization
feasible for Bayesian inference. Our Bayesian method requires no parameter
tuning and can infer the number of latent factors automatically. Experiments on
synthetic and real datasets demonstrate encouraging results on rank recovery
and collaborative filtering, with notably good results for very sparse
matrices.Comment: Accepted to AAAI 201
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