48,957 research outputs found
Minimal Submanifolds asymptotic to AdS4xS2 in AdS5xS5
In this work, as an attempt in understanding the interplay between
deformations of the external and internal spaces associated with the
probe-brane embedding submanifold, we construct the zero-temperature phase
diagram for the coupled phase between two two-dimensional defects stacked
parallel in a four-dimensional ambient spacetime. Different UV parameters are
turned on for different defects. We study the system in the quenched strong
coupling limit, using holography with probe brane approximation, realized
explicitly through the D3/D5 system. This coupled phase is holographic dual to
the presence of spontaneous symmetry breaking of the individual ultraviolet
flavor symmetries associated with the double heterostructure of the defect
layers. We characterize this solution by its infrared geometric data, and
present the numerical result showing a first-order phase transition between the
asymmetrically coupled phase and the more mundane decoupled phase.Comment: 12 pages, 4 figure
The Applicability of the Astrometric Method in Determining the Physical Parameters of Gravitational Microlenses
In this paper, we investigate the applicability of the astrometric method to
the determination of the lens parameters for gravitational microlensing events
toward both the LMC and the Galactic bulge. For this analysis, we investigate
the dependency of the astrometrically determined angular Einstein ring radius,
, on the lens parameters by testing
various types of events. In addition, by computing for events with lensing parameters which are the most
probable for a given lens mass under the standard models of Galactic matter
density and velocity distributions, we determine the expected distribution of
the uncertainties as a function of lens mass. From this study, we find that the
values of the angular Einstein ring radius are expected to be measured with
uncertainties up to a
lens mass of for both Galactic disk-bulge and halo-LMC
events with a moderate observational strategy. The uncertainties are relatively
large for Galactic bulge-bulge self-lensing events, for , but they can be
substantially reduced by adopting more aggressive observational strategies. We
also find that although astrometric observations can be performed for most
photometrically detected Galactic bulge events, a significant fraction () of LMC events cannot be astrometrically observed due to the faintness of
their source stars.Comment: 16 pages, including 2 tables and 4 figures, submitted to Monthly
Notices of the Royal Astronomical Socirt
Entanglement Entropy for Probe Branes
We give a prescription for calculating the entanglement entropy in
holographic probe brane systems by systematically taking the leading order
backreaction of the probe brane into account. We find a simple compact double
integral formula, which is insensitive to many details of the backreaction,
most notably the internal space or the non-metric fields sourced by the probe.
We validate our method by comparing to exact results in solvable toy models. We
also determine the entanglement entropies for a sphere and a strip in the
top-down D3/D7 and D3/D5 system. For the sphere the entanglement entropy has
also been obtained by other methods and we find perfect agreement.Comment: 31 page
Characterization of Microlensing Planets with Moderately Wide Separations
In future high-cadence microlensing surveys, planets can be detected through
a new channel of an independent event produced by the planet itself. The two
populations of planets to be detected through this channel are wide-separation
planets and free-floating planets. Although they appear as similar short
time-scale events, the two populations of planets are widely different in
nature and thus distinguishing them is important. In this paper, we investigate
the lensing properties of events produced by planets with moderately wide
separations from host stars. We find that the lensing behavior of these events
is well described by the Chang-Refsdal lensing and the shear caused by the
primary not only produces a caustic but also makes the magnification contour
elongated along the primary-planet axis. The elongated magnification contour
implies that the light curves of these planetary events are generally
asymmetric and thus the asymmetry can be used to distinguish the events from
those produced by free-floating planets. The asymmetry can be noticed from the
overall shape of the light curve and thus can hardly be missed unlike the very
short-duration central perturbation caused by the caustic. In addition, the
asymmetry occurs regardless of the event magnification and thus the bound
nature of the planet can be identified for majority of these events. The close
approximation of the lensing light curve to that of the Chang-Refsdal lensing
implies that the analysis of the light curve yields only the information about
the projected separation between the host star and the planet.Comment: 4 pages, 2 figure
Queueing Game For Spectrum Access in Cognitive Radio Networks
In this paper, we investigate the problem of spectrum access decision-making
for the Secondary Users (SUs) in the cognitive radio networks. When the Primary
Users (PUs) are absent on certain frequency bandwidth, SUs can formulate a
queue and wait for the Base Station (BS) to serve. The queue of the SUs will be
dismissed if the PU is emerging in the system. Leveraging the queueing game
approaches, the decision-making process of the SUs that whether to queue or not
is studied. Both individual equilibrium and social optimization strategies are
derived analytically. Moreover, the optimal pricing strategy of the service
provider is investigated as well. Our proposed algorithms and corresponding
analysis are validated through simulation studies
Brain-Switches for Asynchronous Brain−Computer Interfaces: A Systematic Review
A brain–computer interface (BCI) has been extensively studied to develop a novel communication system for disabled people using their brain activities. An asynchronous BCI system is more realistic and practical than a synchronous BCI system, in that, BCI commands can be generated whenever the user wants. However, the relatively low performance of an asynchronous BCI system is problematic because redundant BCI commands are required to correct false-positive operations. To significantly reduce the number of false-positive operations of an asynchronous BCI system, a two-step approach has been proposed using a brain-switch that first determines whether the user wants to use an asynchronous BCI system before the operation of the asynchronous BCI system. This study presents a systematic review of the state-of-the-art brain-switch techniques and future research directions. To this end, we reviewed brain-switch research articles published from 2000 to 2019 in terms of their (a) neuroimaging modality, (b) paradigm, (c) operation algorithm, and (d) performance
A Report on the Translation Practice of the Colonial Period of American History in the Perspective of Thick Translation—Exploration of Annotation in the Translation of Historical Texts
Based on the author’s translation practice of the colonial period of American history as a case study, this paper aims to resolve the problem of translating foreign historical texts that are obscure. Guided by in-depth translation, it explores what can be done from the perspective of annotation to make the information in translation be more complete, more accurate, and more readable
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