8,775 research outputs found
A Web Aggregation Approach for Distributed Randomized PageRank Algorithms
The PageRank algorithm employed at Google assigns a measure of importance to
each web page for rankings in search results. In our recent papers, we have
proposed a distributed randomized approach for this algorithm, where web pages
are treated as agents computing their own PageRank by communicating with linked
pages. This paper builds upon this approach to reduce the computation and
communication loads for the algorithms. In particular, we develop a method to
systematically aggregate the web pages into groups by exploiting the sparsity
inherent in the web. For each group, an aggregated PageRank value is computed,
which can then be distributed among the group members. We provide a distributed
update scheme for the aggregated PageRank along with an analysis on its
convergence properties. The method is especially motivated by results on
singular perturbation techniques for large-scale Markov chains and multi-agent
consensus.Comment: To appear in the IEEE Transactions on Automatic Control, 201
Fermion localization on thick branes
We consider chiral fermion confinement in scalar thick branes, which are
known to localize gravity, coupled through a Yukawa term. The conditions for
the confinement and their behavior in the thin-wall limit are found for various
different BPS branes, including double walls and branes interpolating between
different AdS_5 spacetimes. We show that only one massless chiral mode is
localized in all these walls, whenever the wall thickness is keep finite. We
also show that, independently of wall's thickness, chiral fermionic modes
cannot be localized in dS_4 walls embedded in a M_5 spacetime. Finally, massive
fermions in double wall spacetimes are also investigated. We find that, besides
the massless chiral mode localization, these double walls support
quasi-localized massive modes of both chiralities.Comment: 8 pages, 3 figure
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