16,576 research outputs found
A Dynamic Modification to Sneutrino Chaotic Inflation
We consider a right-handed scalar neutrino as the inflaton which carries a
gravitational coupling with a supersymmetric QCD sector responsible for
breaking supersymmetry dynamically. The framework suggests an inflaton
potential which is a deformed version of the quadratic chaotic inflation
leading to a flatter potential. We find that this deformation results a sizable
tensor to scalar ratio which falls within the allowed region by PLANCK 2015. At
the same time supersymmetry breaking at the end of inflation can naturally be
induced in this set-up. The symmetries required to construct the framework
allows the neutrino masses and mixing to be of right order.Comment: 24 pages, 3 figures; version to appear in JHE
Higgs Vacuum Stability and Modified Chaotic Inflation
The issue of electroweak vacuum stability is studied in presence of a scalar
field which participates in modifying the minimal chaotic inflation model. It
is shown that the threshold effect on the Higgs quartic coupling originating
from the Higgs-inflaton sector interaction can essentially make the electroweak
vacuum stable upto the Planck scale. On the other hand we observe that the new
physics parameters in this combined framework are enough to provide deviation
from the minimal chaotic inflation predictions so as to keep it consistent with
recent observation by Planck 2015.Comment: 17 pages, 7 figure
FS^3: A Sampling based method for top-k Frequent Subgraph Mining
Mining labeled subgraph is a popular research task in data mining because of
its potential application in many different scientific domains. All the
existing methods for this task explicitly or implicitly solve the subgraph
isomorphism task which is computationally expensive, so they suffer from the
lack of scalability problem when the graphs in the input database are large. In
this work, we propose FS^3, which is a sampling based method. It mines a small
collection of subgraphs that are most frequent in the probabilistic sense. FS^3
performs a Markov Chain Monte Carlo (MCMC) sampling over the space of a
fixed-size subgraphs such that the potentially frequent subgraphs are sampled
more often. Besides, FS^3 is equipped with an innovative queue manager. It
stores the sampled subgraph in a finite queue over the course of mining in such
a manner that the top-k positions in the queue contain the most frequent
subgraphs. Our experiments on database of large graphs show that FS^3 is
efficient, and it obtains subgraphs that are the most frequent amongst the
subgraphs of a given size
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