22,419 research outputs found
Observational constraints on the energy scale of inflation
Determining the energy scale of inflation is crucial to understand the nature
of inflation in the early Universe. We place observational constraints on the
energy scale of the observable part of the inflaton potential by combining the
7-year Wilkinson Microwave Anisotropy Probe data with distance measurements
from the baryon acoustic oscillations in the distribution of galaxies and the
Hubble constant measurement. Our analysis provides an upper limit on this
energy scale, 2.3 \times 10^{16} GeV at 95% confidence level. Moreover, we
forecast the sensitivity and constraints achievable by the Planck experiment by
performing Monte Carlo studies on simulated data. Planck could significantly
improve the constraints on the energy scale of inflation and on the shape of
the inflaton potential.Comment: 7 pages, 3 figures, RevTeX, published versio
Beam energy dependence of Hanbury-Brown-Twiss radii from a blast-wave model
The beam energy dependence of correlation lengths (the Hanbury-Brown-Twiss
radii) is calculated by using a blast-wave model and the results are comparable
with those from RHIC-STAR beam energy scan data as well as the LHC-ALICE
measurements. A set of parameter for the blast-wave model as a function of beam
energy under study are obtained by fit to the HBT radii at each energy point.
The transverse momentum dependence of HBT radii is presented with the extracted
parameters for Au + Au collision at 200 GeV and for Pb+Pb
collisions at 2.76 TeV. From our study one can learn that particle emission
duration can not be ignored while calculating the HBT radii with the same
parameters. And tuning kinetic freeze-out temperature in a range will result in
system lifetime changing in the reverse direction as it is found in RHIC-STAR
experiment measurements.Comment: 9 pages, 9 figure
Learning a Hybrid Architecture for Sequence Regression and Annotation
When learning a hidden Markov model (HMM), sequen- tial observations can
often be complemented by real-valued summary response variables generated from
the path of hid- den states. Such settings arise in numerous domains, includ-
ing many applications in biology, like motif discovery and genome annotation.
In this paper, we present a flexible frame- work for jointly modeling both
latent sequence features and the functional mapping that relates the summary
response variables to the hidden state sequence. The algorithm is com- patible
with a rich set of mapping functions. Results show that the availability of
additional continuous response vari- ables can simultaneously improve the
annotation of the se- quential observations and yield good prediction
performance in both synthetic data and real-world datasets.Comment: AAAI 201
Multiparty Quantum Secret Sharing
Based on a quantum secure direct communication (QSDC) protocol [Phys. Rev.
A69(04)052319], we propose a -threshold scheme of multiparty quantum
secret sharing of classical messages (QSSCM) using only single photons. We take
advantage of this multiparty QSSCM scheme to establish a scheme of multiparty
secret sharing of quantum information (SSQI), in which only all quantum
information receivers collaborate can the original qubit be reconstructed. A
general idea is also proposed for constructing multiparty SSQI schemes from any
QSSCM scheme
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