11,428 research outputs found
Determining Hadron-Quark Phase Transition Chemical Potential via Astronomical Observations
We propose a scheme to determine the chemical potential and baryon number
density of the hadron-quark phase transition in cold dense strong interaction
matter (compact star matter). The hadron matter is described with the
relativistic mean field theory, and the quark matter is described with the
Dyson-Schwinger equation approach of QCD. To study the first-order phase
transition, we take the sound speed as the interpolation objective to construct
the equation of state in the middle density region. With the maximum mass, the
tidal deformability and the radius of neutron stars being taken as calibration
quantities, the phase transition chemical potential is constrained to a quite
small range. And the most probable value of the phase transition chemical
potential is found.Comment: 5 pages, 3 figures, 1 tabl
Constraining the Hadron-Quark Phase Transition Chemical Potential via Astronomical Observation
We investigate the chemical potential and baryon number density of the
hadron-quark phase transition in neutron star matter. The hadron matter is
described with relativistic mean field theory, and the quark matter is
described with the Dyson-Schwinger equation approach of QCD. In order to study
the first-order phase transition, we develop the sound speed interpolation
scheme to construct the equation of state in the middle density region where
the hadron phase and quark phase coexist. The phase transition chemical
potential is constrained with the maximum mass, the tidal deformability and the
radius of neutrons stars. And the most probable value of the phase transition
chemical potential is found.Comment: 20 pages, 11 figures, 2 tables. Extension of arXiv:1903.12336.
Contribution to the Proceedings of the CUSTIPEN Workshop on the EOS of Dense
Neutron-Rich Matter in the Era of Gravitational-Wave Astronomy. One Figure,
some discussions and References adde
On Exploring Undetermined Relationships for Visual Relationship Detection
In visual relationship detection, human-notated relationships can be regarded
as determinate relationships. However, there are still large amount of
unlabeled data, such as object pairs with less significant relationships or
even with no relationships. We refer to these unlabeled but potentially useful
data as undetermined relationships. Although a vast body of literature exists,
few methods exploit these undetermined relationships for visual relationship
detection.
In this paper, we explore the beneficial effect of undetermined relationships
on visual relationship detection. We propose a novel multi-modal feature based
undetermined relationship learning network (MF-URLN) and achieve great
improvements in relationship detection. In detail, our MF-URLN automatically
generates undetermined relationships by comparing object pairs with
human-notated data according to a designed criterion. Then, the MF-URLN
extracts and fuses features of object pairs from three complementary modals:
visual, spatial, and linguistic modals. Further, the MF-URLN proposes two
correlated subnetworks: one subnetwork decides the determinate confidence, and
the other predicts the relationships. We evaluate the MF-URLN on two datasets:
the Visual Relationship Detection (VRD) and the Visual Genome (VG) datasets.
The experimental results compared with state-of-the-art methods verify the
significant improvements made by the undetermined relationships, e.g., the
top-50 relation detection recall improves from 19.5% to 23.9% on the VRD
dataset
Incentivizing Users of Data Centers Participate in The Demand Response Programs via Time-Varying Monetary Rewards
Demand response is widely employed by today's data centers to reduce energy
consumption in response to the increasing of electricity cost. To incentivize
users of data centers participate in the demand response programs, i.e.,
breaking the "split incentive" hurdle, some prior researches propose
market-based mechanisms such as dynamic pricing and static monetary rewards.
However, these mechanisms are either intrusive or unfair. In this paper, we use
time-varying rewards to incentivize users, who have flexible deadlines and are
willing to trading performance degradation for monetary rewards, grant
time-shifting of their requests. With a game-theoretic framework, we model the
game between a single data center and its users. Further, we extend our design
via integrating it with two other emerging practical demand response
strategies: server shutdown and local renewable energy generation. With
real-world data traces, we show that a DC with our design can effectively shed
its peak electricity load and overall electricity cost without reducing its
profit, when comparing it with the current practice where no incentive
mechanism is established
Instance Search via Instance Level Segmentation and Feature Representation
Instance search is an interesting task as well as a challenging issue due to
the lack of effective feature representation. In this paper, an instance level
feature representation built upon fully convolutional instance-aware
segmentation is proposed. The feature is ROI-pooled from the segmented instance
region. So that instances in various sizes and layouts are represented by deep
features in uniform length. This representation is further enhanced by the use
of deformable ResNeXt blocks. Superior performance is observed in terms of its
distinctiveness and scalability on a challenging evaluation dataset built by
ourselves. In addition, the proposed enhancement on the network structure also
shows superior performance on the instance segmentation task
Preparing remotely two instances of quantum state
In this short note, we propose a scheme, in which two instances of an
equatorial state (or a polar state) can be remotely prepared in one-shot
operation to different receivers with prior entanglement and 1 bit of
broadcasting. The trade-off curve between the amount of entanglement and the
achievable fidelity is derived.Comment: 7 pages, 1 figur
Cyclic Quantum Dilogarithm and Shift Operator
{}From the cyclic quantum dilogarithm the shift operator is constructed with
is a root of unit and the representation is given for the current algebra
introduced by Faddeev . It is shown that the theta-function is
factorizable also in this case by using the star-square equation of the
Baxter-Bazhanov model.Comment: 9 pages, latex, no figure
A Quantum Spin Hall Round Disk as a Spin Rotator and Filter
We study theoretically the spin transport of a Quantum Spin Hall round disk.
When an electron traverses the disk in virtue of the edge states, its spin's
in-plane component can be rotated by a magnetic flux through the disk. The spin
rotation occurs due to the interference of two helical edge states with
opposite spins, which is regarded as the Aharonov-Bohm effect in the spin space
and a manifestation of the Berry phase. Besides, the disk has a spin filter
effect on the tunneling current when we apply an appropriate magnetic field and
gate voltage on it. The spin polarization ratio can reach 100% when the
couplings between the disk and leads are weak.Comment: 6 pages, 4 figure
Remarks on the Star-Triangle Relation in the Baxter-Bazhanov Model
In this letter we show that the restricted star-triangle relation introduced
by Bazhanov and Baxter can be obtained either from the star-triangle relation
of chiral Potts model or from the star-square relation which is proposed by
Kashaev and give a response of the guess which is suggested by
Bazhanov and Baxter in Ref. \cite{b2}.Comment: 6 pages, latex file, AS-ITP-94-3
Collective Shape-Phases of Interacting Fermion Systems
A microscopic theory is presented for identifying shape-phase structures and
transitions in interacting fermion systems. The method provides a microscopic
description for collective shape-phases, and reveals detailed dependence of
such shape-phases on microscopic interaction strengths. The theory is generally
applicable to fermion systems such as nuclei, quarks, and in particular trapped
cold atoms, where shape-phases may be observed and investigated in a controlled
manner.Comment: 4 pages, 6 figure
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