3
3.0
Jun 30, 2018
06/18
by
Akitoshi Kawamura; Yusuke Kobayashi
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Suppose we want to patrol a fence (line segment) using k mobile agents with given speeds v_1, ..., v_k so that every point on the fence is visited by an agent at least once in every unit time period. Czyzowicz et al. conjectured that the maximum length of the fence that can be patrolled is (v_1 + ... + v_k)/2, which is achieved by the simple strategy where each agent i moves back and forth in a segment of length v_i/2. We disprove this conjecture by a counterexample involving k = 6 agents. We...
Topics: Multiagent Systems, Computing Research Repository, Computational Geometry, Robotics
Source: http://arxiv.org/abs/1407.8194
5
5.0
Jun 30, 2018
06/18
by
Alejandro Edera; Yanela Strappa; Facundo Bromberg
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Markov networks are models for compactly representing complex probability distributions. They are composed by a structure and a set of numerical weights. The structure qualitatively describes independences in the distribution, which can be exploited to factorize the distribution into a set of compact functions. A key application for learning structures from data is to automatically discover knowledge. In practice, structure learning algorithms focused on "knowledge discovery" present...
Topics: Computing Research Repository, Data Structures and Algorithms, Learning
Source: http://arxiv.org/abs/1407.8088
4
4.0
Jun 30, 2018
06/18
by
Chia-Yu Hsieh; YunKyong Hyon; Hijin Lee; Tai-Chia Lin; Chun Liu
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In order to describe the dynamics of crowded ions (charged particles), we use an energetic variation approach to derive a modified Poisson-Nernst-Planck (PNP) system which includes an extra dissipation due to the effective velocity differences between ion species. Such a system is more complicated than the original PNP system but with the same equilibrium states. Using Schauder's fixed-point theorem, we develop a local existence theorem of classical solutions for the modified PNP system....
Topics: Mathematics, Analysis of PDEs, Mathematical Physics
Source: http://arxiv.org/abs/1407.8245
12
12
Jun 30, 2018
06/18
by
G. A. Beer; Y. Fujiwara; S. Hirota; K. Ishida; M. Iwasaki; S. Kanda; H. Kawai; N. Kawamura; R. Kitamura; S. Lee; W. Lee G. M. Marshall; T. Mibe; Y. Miyake; S. Okada; K. Olchanski; A. Olin; Y. Oishi; H. Onishi; M. Otani; N. Saito; K. Shimomura; P. Strasser; M. Tabata; D. Tomono; K. Ueno; K. Yokoyama; E. Won
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Emission of muonium ($\mu^+e^-$) atoms from a laser-processed aerogel surface into vacuum was studied for the first time. Laser ablation was used to create hole-like regions with diameter of about 270$~\mu$m in a triangular pattern with hole separation in the range of 300--500$~\mu$m. The emission probability for the laser-processed aerogel sample is at least eight times higher than for a uniform one.
Topics: Physics, High Energy Physics - Experiment, Atomic Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1407.8248
4
4.0
Jun 30, 2018
06/18
by
Jige Chen; Yi Gao; Chunlei Wang; Renliang Zhang; Hong Zhao; Haiping Fang
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Thermally driven nanotube nanomotors provide linear mass transportation controlled by a temperature gradient. However, the underlying mechanism is still unclear where the mass transportation velocity in experiment is much lower than that resulting from simulations. Considering that defects are common in fabricated nanotubes, we use molecular dynamics simulations to show that the mass transportation would be considerably impeded by the potential barriers or wells induced by the defects, which...
Topics: Mesoscale and Nanoscale Physics, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1407.8263
3
3.0
Jun 30, 2018
06/18
by
Jing Tang; Shuo Cao; Yunan Gao; Yue Sun; Weidong Geng; David A. Williams; Kuijuan Jin; Xiulai Xu
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We report a photoluminescence (PL) spectroscopy study of charge state control in single self-assembled InAs/GaAs quantum dots by applying electric and/or magnetic fields at 4.2 K. Neutral and charged exciton complexes were observed under applied bias voltages from -0.5 V to 0.5 V by controlling the carrier tunneling. The highly negatively charged exciton emission becomes stronger with increasing pumping power, arising from the fact that electrons have a smaller effective mass than holes and are...
Topics: Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1407.7980
3
3.0
Jun 30, 2018
06/18
by
Jing Zhang; Yu-xi Liu; Re-Bing Wu; Kurt Jacobs; Sahin Kaya Ozdemir; Lan Yang; Tzyh-Jong Tarn; Franco Nori
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Quantum input-output theory plays a very important role for analyzing the dynamics of quantum systems, especially large-scale quantum networks. As an extension of the input-output formalism of Gardiner and Collet, we develop a new approach based on the quantum version of the Volterra series which can be used to analyze nonlinear quantum input-output dynamics. By this approach, we can ignore the internal dynamics of the quantum input-output system and represent the system dynamics by a series of...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8108
6
6.0
Jun 30, 2018
06/18
by
Kanishka Perera; Marco Squassina; Yang Yang
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In this paper we investivate bifurcation results for a class of problem in a smooth bounded domain involving the fractional p-Laplacian operator and with a nonlinearity that reaches the critical growth with respect to the fractional Sobolev embedding.
Topics: Mathematics, Analysis of PDEs
Source: http://arxiv.org/abs/1407.8061
4
4.0
Jun 30, 2018
06/18
by
L. Amati; J. Braga; F. Frontera; C. Labanti; M. Feroci; R. Hudec; A. Gomboc; R. Ruffini; A. Santangelo; A. Vacchi; R. Campana; Y. Evangelista; F. Fuschino; R. Salvaterra; G. Stratta; G. Tagliaferri; C. Guidorzi; P. Rosati; L. Titarchuk; A. Penacchioni; L. Izzo; N. Zampa; T. Rodic; on behalf of the GAME collaboration
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We describe the GRB and All-sky Monitor Experiment (GAME) mission submitted by a large international collaboration (Italy, Germany, Czech Repubblic, Slovenia, Brazil) in response to the 2012 ESA call for a small mission opportunity for a launch in 2017 and presently under further investigation for subsequent opportunities. The general scientific objective is to perform measurements of key importance for GRB science and to provide the wide astrophysical community of an advanced X-ray all-sky...
Topics: Instrumentation and Methods for Astrophysics, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1407.8126
6
6.0
Jun 30, 2018
06/18
by
LHCb collaboration; R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; K. Carvalho Akiba; G. Casse; L. Cassina; L. Castillo Garcia; M. Cattaneo; Ch. Cauet; R. Cenci; M. Charles; Ph. Charpentier; S. Chen; G. Alkhazov; S. -F. Cheung; N. Chiapolini; M. Chrzaszcz; K. Ciba; X. Cid Vidal; G. Ciezarek; P. E. L. Clarke; M. Clemencic; H. V. Cliff; J. Closier; P. Alvarez Cartelle; V. Coco; J. Cogan; E. Cogneras; P. Collins; A....
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An analysis of B0->D K*0 decays is presented, where D represents an admixture of D0 and D0b mesons reconstructed in four separate final states: K-pi+, pi-K+, K+K- and pi+pi-. The data sample corresponds to 3.0fb-1 of proton-proton collision, collected by the LHCb experiment. Measurements of several observables are performed, including CP asymmetries. The most precise determination is presented of rB(DK*0), the magnitude of the ratio of the amplitudes of the decay B0->D K+ pi- with a...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1407.8136
3
3.0
Jun 30, 2018
06/18
by
Luke Jostins; Yali Xu; Shane McCarthy; Qasim Ayub; Richard Durbin; Jeff Barrett; Chris Tyler-Smith
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Low-coverage short-read resequencing experiments have the potential to expand our understanding of Y chromosome haplogroups. However, the uncertainty associated with these experiments mean that haplogroups must be assigned probabilistically to avoid false inferences. We propose an efficient dynamic programming algorithm that can assign haplogroups by maximum likelihood, and represent the uncertainty in assignment. We apply this to both genotype and low-coverage sequencing data, and show that it...
Topics: Populations and Evolution, Quantitative Biology, Genomics
Source: http://arxiv.org/abs/1407.7988
8
8.0
Jun 30, 2018
06/18
by
O. Hen; L. B. Weinstein; E. Piasetzky; G. A. Miller; M. M. Sargsian; Y. Sagi
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eye 8
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Background: The high momentum distribution of atoms in two spin-state ultra-cold atomic gases with strong short-range interactions between atoms with different spins, which can be described using Tan's contact, are dominated by short range pairs of different fermions and decreases as $k^{-4}$. In atomic nuclei the momentum distribution of nucleons above the Fermi momentum ($k>k_F \approx 250$ Mev/c) is also dominated by short rangecorrelated different-fermion (neutron-proton) pairs. Purpose:...
Topics: Quantum Gases, Nuclear Experiment, Nuclear Theory, Condensed Matter
Source: http://arxiv.org/abs/1407.8175
6
6.0
Jun 30, 2018
06/18
by
Richard Baraniuk; Simon Foucart; Deanna Needell; Yaniv Plan; Mary Wootters
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Binary measurements arise naturally in a variety of statistical and engineering applications. They may be inherent to the problem---e.g., in determining the relationship between genetics and the presence or absence of a disease---or they may be a result of extreme quantization. In one-bit compressed sensing it has recently been shown that the number of one-bit measurements required for signal estimation mirrors that of unquantized compressed sensing. Indeed, $s$-sparse signals in $\mathbb{R}^n$...
Topics: Mathematics, Computing Research Repository, Information Theory, Statistics Theory, Statistics
Source: http://arxiv.org/abs/1407.8246
4
4.0
Jun 30, 2018
06/18
by
S. Ehlert; S. W. Allen; W. N. Brandt; R. E. A. Canning; B. Luo; A. Mantz; R. G. Morris; A. von der Linden; Y. Q. Xue
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We present the results of a new analysis of the X-ray selected Active Galactic Nuclei (AGN) population in the vicinity of 135 of the most massive galaxy clusters in the redshift range of 0.2 < z < 0.9 observed with Chandra. With a sample of more than 11,000 X-ray point sources, we are able to measure, for the first time, evidence for evolution in the cluster AGN population beyond the expected evolution of field AGN. Our analysis shows that overall number density of cluster AGN scales with...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8181
3
3.0
Jun 30, 2018
06/18
by
T. Konno; T. Adachi; M. Imaizumi; T. Noji; T. Kawamata; Y. Koike
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In order to investigate details of the superconducting (SC) gap in the iron-chalcogenide superconductors, the specific heat, C, of FeSe_1-x_Te_x_ with x=0.6-1 has been measured in magnetic fields. Using the two-gap model, it has been found that the smaller SC gap is significantly depressed by the application of magnetic field, resulting in the increase of the slope of the C/T vs T^2^ plot at low temperatures. From the specific-heat measurements at very low temperatures down to 0.4 K, it has...
Topics: Superconductivity, Condensed Matter
Source: http://arxiv.org/abs/1407.8266
6
6.0
Jun 30, 2018
06/18
by
Wan-Li Ju; Guo-Li Wang; Hui-Feng Fu; Zhi-Hui Wang; Ying Li
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eye 6
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The rare processes $B_c\to D_{(s)J} ^{(*)}\mu\bar{\mu}$, where $D_{(s)J}^{(*)}$ stands for the final meson $D_{s0}^*(2317)$, $D_{s1}(2460,2536)$,~$D_{s2}^*(2573)$, $D_0^*(2400)$, $D_{1}(2420,2430)$ or~$D_{2}^*(2460)$, are studied within the Standard Model. The hadronic matrix elements are evaluated in the Bethe-Salpeter approach and furthermore a discussion on the gauge-invariant condition of the annihilation hadronic currents is presented. Considering the penguin, box, annihilation,...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1407.7968
6
6.0
Jun 30, 2018
06/18
by
Xue Pan; Mingmei Xu; Yuanfang Wu
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eye 6
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Through the Monte Carlo simulation of the three-dimensional, three-state Potts model, which is a paradigm of finite-temperature pure gauge QCD, we study the fluctuations of generalized susceptibilities near the temperatures of external fields of first-, second-order phase transitions and crossover. Similar peak-like fluctuation appears in the second order susceptibility at three given external fields. Oscillation-like fluctuation appears in the third and fourth order susceptibilities. We find...
Topics: High Energy Physics - Lattice, Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1407.7957
5
5.0
Jun 30, 2018
06/18
by
Ya-feng He; Wei-hua Gong; Yong-liang Zhang; Fu-cheng Liu
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eye 5
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Hypocycloid and epicycloid motions of irregular grain (pine pollen) are observed for the first time in unmagnetized dust plasma in 2D horizontal plane. Hypocycloid motions occur both inside and outside the glass ring which confines the grain. Epicycloid motion only appears outside the glass ring. Cuspate cycloid motions, circle motion, and stationary grain are also observed. All these motions are related with both the initial conditions of dropped grain and the discharge parameters. The Magnus...
Topics: Physics, Plasma Physics
Source: http://arxiv.org/abs/1407.7962
6
6.0
Jun 30, 2018
06/18
by
Yan-Lin Tang; Hua-Lei Yin; Si-Jing Chen; Yang Liu; Wei-Jun Zhang; Xiao Jiang; Lu Zhang; Jian Wang; Li-Xing You; Jian-Yu Guan; Dong-Xu Yang; Zhen Wang; Hao Liang; Zhen Zhang; Nan Zhou; Xiongfeng Ma; Teng-Yun Chen; Qiang Zhang; Jian-Wei Pan
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eye 6
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Measurement-device-independent quantum key distribution (MDIQKD) protocol is immune to all attacks on detection and guarantees the information-theoretical security even with imperfect single photon detectors. Recently, several proof-of-principle demonstrations of MDIQKD have been achieved. Those experiments, although novel, are implemented through limited distance with a key rate less than 0.1 bps. Here, by developing a 75 MHz clock rate fully-automatic and highly-stable system, and...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8012
4
4.0
Jun 30, 2018
06/18
by
Yanyong Hong
texts
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Fix a positive integer number $r$. A class of $r$-dim Lie conformal superalgebras named $r$-dim $i$-linear Lie conformal superalgebras are studied for $1\leq i \leq r$. We present an equivalent characterization of this class of Lie conformal superalgebras in $r$ dimension. Moreover, by this equivalent characterization, several constructions and examples are given.
Topics: Quantum Algebra, Mathematics, Rings and Algebras
Source: http://arxiv.org/abs/1407.8240
3
3.0
Jun 30, 2018
06/18
by
Yaping Yang; Gufang Zhao
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We introduce for each quiver $Q$ and each algebraic oriented cohomology theory $A$, the cohomological Hall algebra (CoHA) of $Q$, as the $A$-homology of the moduli of representations of the preprojective algebra of $Q$. This generalizes the $K$-theoretic Hall algebra of commuting varieties defined by Schiffmann-Vasserot. We construct an action of the preprojective CoHA on the $A$-homology of Nakajima quiver varieties. We compare this with the action of the Borel subalgebra of Yangian when $A$...
Topics: Mathematics, Representation Theory
Source: http://arxiv.org/abs/1407.7994
3
3.0
Jun 30, 2018
06/18
by
Yawar Mohammadi; Rostam Moradian
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We study the RKKY interaction between two magnetic impurities located on same layer (intralayer case) or on different layers (interlayer case) in undoped bilayer graphene in the four-bands model, by directly calculating the Green functions in the eigenvalues and eigenvectors representation. Our results show that both intra- and interlayer RKKY interactions between two magnetic impurities located on same (opposite) sublattice are always ferromagnetic (antiferromagnetic). Furthermore we find...
Topics: Mesoscale and Nanoscale Physics, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1407.7959
4
4.0
Jun 30, 2018
06/18
by
Yiran Wang; R. J. Brunner
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eye 4
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We analyze the clustering of photometrically selected galaxy pairs by using the halo-occupation distribution (HOD) model. We measure the angular two-point auto-correlation function, $\omega(\theta)$, for galaxies and galaxy pairs in three volume-limited samples and develop an HOD to model their clustering. Our results are successfully fit by these HOD models, and we see the separation of "1-halo" and "2-halo" clustering terms for both single galaxies and galaxy pairs. Our...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8230
10
10.0
Jun 30, 2018
06/18
by
Yixuan Xie; Jinhong Yuan; Qifu; Sun
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We propose two types, namely Type-I and Type-II, quantum stabilizer codes using quadratic residue sets of prime modulus given by the form $p=4n\pm1$. The proposed Type-I stabilizer codes are of cyclic structure and code length $N=p$. They are constructed based on multi-weight circulant matrix generated from idempotent polynomial, which is obtained from a quadratic residue set. The proposed Type-II stabilizer codes are of quasi-cyclic (QC) structure and code length $N=pk$, where $k$ is the size...
Topics: Mathematics, Computing Research Repository, Information Theory
Source: http://arxiv.org/abs/1407.8249
4
4.0
Jun 30, 2018
06/18
by
Yoshihiro Nishiyama
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The two-magnon-bound-state mass gap m_2 for the two-dimensional quantum Ising model was investigated by means of the numerical diagonalization method; the low-lying spectrum is directly accessible via the numerical diagonalization method. It has been claimed that the ratio m_2/m_1 (m_1: one-magnon mass gap) is a universal constant in the vicinity of the critical point. Aiming to suppress corrections to scaling (lattice artifact), we consider the spin-S=1 Ising model with finely-adjusted...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1407.8243
7
7.0
Jun 30, 2018
06/18
by
Yuan Zhu; Siyun Tang
texts
eye 7
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In this paper, a new algebraic soft-decision decoding algorithm for Reed-Solomon code is presented. It is based on rational interpolation and the interpolation points are constructed by Berlekamp-Messay algorithm. Unlike the traditional K{\"o}tter-Vardy algorithm, new algorithm needs interpolation for two smaller multiplicity matrixes, due to the corresponding factorization algorithm for re-constructing codewords.
Topics: Mathematics, Computing Research Repository, Information Theory
Source: http://arxiv.org/abs/1407.8069
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61
Jun 30, 2018
06/18
by
Yuancheng Fan; Fuli Zhang; Qian Zhao; Zeyong Wei; Hongqiang Li
texts
eye 61
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Coherent perfect absorber (CPA) was proposed as the time-reversed counterpart to laser: a resonator containing lossy medium instead of gain medium can absorb the coherent optical fields completely. Here, we exploit a monolayer graphene to realize the CPA in a non-resonant manner. It is found that quasi-CPA point exists in the terahertz regime for suspending monolayer graphene, and the CPA can be implemented with the assistant of proper phase modulation among two incident beams at the quasi-CPA...
Topics: Physics, Mesoscale and Nanoscale Physics, Optics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1407.7961
3
3.0
Jun 30, 2018
06/18
by
Yuchen Peng; Frank Gaitan
texts
eye 3
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Successful implementation of a fault-tolerant quantum computation on a system of qubits places severe demands on the hardware used to control the many-qubit state. It is known that an accuracy threshold $P_{a}$ exists for any quantum gate that is to be used in such a computation. Specifically, the error probability $P_{e}$ for such a gate must fall below the accuracy threshold: $P_{e} < P_{a}$. Estimates of $P_{a}$ vary widely, though $P_{a}\sim 10^{-4}$ has emerged as a challenging target...
Topics: Quantum Physics, Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1407.8074
10
10.0
Jun 30, 2018
06/18
by
Yuhong Xu
texts
eye 10
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Model uncertainty is a type of inevitable financial risk. Mistakes on the choice of pricing model may cause great financial losses. In this paper we investigate financial markets with mean-volatility uncertainty. Models for stock markets and option markets with uncertain prior distribution are established by Peng's G-stochastic calculus. The process of stock price is described by generalized geometric G-Brownian motion in which the mean uncertainty may move together with or regardless of the...
Topics: Quantitative Finance, Pricing of Securities
Source: http://arxiv.org/abs/1407.8024
3
3.0
Jun 30, 2018
06/18
by
Yun-Fei Yang; Hui-Xue Qu; Kai-Fan Ji; Song Feng; Hui Deng; Jia-Ben Lin; Feng Wang
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We study the motions of G band bright points (GBPs) in the quiet Sun to obtain the characteristics of different motion types. A high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT) is used, and GBPs are automatically tracked by segmenting 3D evolutional structures in a space time cube. After putting the GBPs that do not move during their lifetimes aside, the non stationary GBPs are categorized into three types based on an index of motion type. Most GBPs that move...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.7958
