14,461 research outputs found
Comments on "Observation of Long-Range, Near-Side Angular Correlations in proton-proton Collisions at the LHC" by CMS Collaboration. arXiv:1009.4122[hep-ex]
We present comments on the paper "Observation of Long-Range, Near-Side
Angular Correlations in proton-proton Collisions at the LHC"
Trust and obfuscation principles for quality of information in emerging pervasive environments
Non peer reviewedPostprin
Applications of concurrent access patterns in web usage mining
This paper builds on the original data mining and modelling research which has proposed the discovery of novel structural relation patterns, applying the approach in web usage mining. The focus of attention here is on concurrent access patterns (CAP), where an overarching framework illuminates the methodology for web access patterns post-processing. Data pre-processing, pattern discovery and patterns analysis all proceed in association with access patterns mining, CAP mining and CAP modelling. Pruning and selection of access pat-terns takes place as necessary, allowing further CAP mining and modelling to be pursued in the search for the most interesting concurrent access patterns. It is shown that higher level CAPs can be modelled in a way which brings greater structure to bear on the process of knowledge discovery. Experiments with real-world datasets highlight the applicability of the approach in web navigation
Shell model description of Ge isotopes
A shell model study of the low energy region of the spectra in Ge isotopes
for is presented, analyzing the excitation energies,
quadrupole moments, values and occupation numbers. The theoretical
results have been compared with the available experimental data. The shell
model calculations have been performed employing three different effective
interactions and valence spaces.We have used two effective shell model
interactions, JUN45 and jj44b, for the valence space
without truncation. To include the proton subshell in valence space
we have employed the effective interaction due to Sorlin {\it et al.},
with Ca as a core and a truncation in the number of excited particles.Comment: 10 pages, 10 figures, Proc. of the XXXV Nuclear Physics Symposium,
January 3-6 2012, Cocoyoc, Morelos, Mexico. IOP Journal of Physics:
Conference Series (in press
Probing Gauge String Formation in a Superconducting Phase Transition
Superconductors are the only experimentally accessible systems with
spontaneously broken gauge symmetries which support topologically nontrivial
defects, namely string defects. We propose two experiments whose aim is the
observation of the dense network of these strings thought to arise, via the
Kibble mechanism, in the course of a spontaneous symmetry breaking phase
transition. We suggest ways to estimate the order of magnitude of the density
of flux tubes produced in the phase transition. This may provide an
experimental check for the theories of the production of topological defects in
a spontaneously broken gauge theory, such as those employed in the context of
the early Universe.Comment: 16 pages (Latex), 4 figures included, change in title, some minor
changes, published versio
Formation of Topological Defects with Explicit Symmetry Breaking
We demonstrate a novel mechanism for the formation of topological defects in
a first order phase transition for theories in the presence of small explicit
symmetry breaking terms. We carry out numerical simulations of collisions of
two bubbles in 2+1 dimensions for a field theory where U(1) global symmetry is
spontaneously as well as explicitly broken. In the coalesced region of bubble
walls, field oscillations result in the decay of the coalesced portion in a
large number of defects (e.g. ten vortices and anti-vortices). We discuss the
implications of our results for axionic strings in the early Universe, for
baryon formation in quark-gluon plasma, and for electric or magnetic field.Comment: Latex file, 8 pages, 6 uuencoded postscript figure
The extent of strangeness in equilibration in quark-gluon plasma
The evolution and production of strangeness from chemically equilibrating and
transversely expanding quark gluon plasma which may be formed in the wake of
relativistic heavy ion collisions is studied with initial conditions obtained
from the Self Screened Parton Cascade (SSPC) model. The extent of partonic
equilibration increases almost linearly with the square of the initial energy
density, which can then be scaled with number of participants.Comment: 4 pages including three figures, talk given at ICPAQGP'01, Jaipur,
India, to appear in Pramana - Journal of Physics, Indian Academy of Scienc
Cosmic Evolution with Early and Late Acceleration Inspired by Dual Nature of the Ricci Scalar Curvature
In the present paper, it is found that dark energy emerges spontaneously from
the modified gravity. According to cosmological scenario, obtained here, the
universe inflates for sec. in the beginning and late universe
accelerates after 8.58 Gyrs. During the long intermediate period, it
decelerates driven by radiation and subsequently by matter. Emerged
gravitational dark energy mimics quintessence and its density falls by 115
orders from its initial value to its current
value .Comment: 40 pages. To appearin Int. J. Mod. Phys.
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