56
56
Jun 30, 2018
06/18
by
A. O. Smirnov; E. G. Semenova; V. Zinger; N. Zinger
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A periodic two-phase algebro-geometric solution of the focusing nonlinear Schr\"odinger equation is constructed in terms of elliptic Jacobi theta-functions. A dependence of this solution on the parameters of a spectral curve is investigated. An existence of a real smooth finite-gap solution of NLS equation with complex initial phase is proven. Degenerations of the constructed solution to one-phase traveling wave solution and solutions in the form of the plane waves are carried.
Topics: Mathematics, Nonlinear Sciences, Exactly Solvable and Integrable Systems, Mathematical Physics,...
Source: http://arxiv.org/abs/1407.7974
5
5.0
Jun 30, 2018
06/18
by
Brynmor Haskell; Nils Andersson; Caroline D`Angelo; Nathalie Degenaar; Kostas Glampedakis; Wynn C. G. Ho; Paul D. Lasky; Andrew Melatos; Manuel Oppenoorth; Alessandro Patruno; Maxim Priymak
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Rapidly rotating neutron stars in Low Mass X-ray Binaries have been proposed as an interesting source of gravitational waves. In this chapter we present estimates of the gravitational wave emission for various scenarios, given the (electromagnetically) observed characteristics of these systems. First of all we focus on the r-mode instability and show that a 'minimal' neutron star model (which does not incorporate exotica in the core, dynamically important magnetic fields or superfluid degrees...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Solar and Stellar Astrophysics, General...
Source: http://arxiv.org/abs/1407.8254
3
3.0
Jun 30, 2018
06/18
by
Cesare Alippi; Maurizio Bocca; Giacomo Boracchi; Neal Patwari; Manuel Roveri
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RF sensor networks are used to localize people indoor without requiring them to wear invasive electronic devices. These wireless mesh networks, formed by low-power radio transceivers, continuously measure the received signal strength (RSS) of the links. Radio Tomographic Imaging (RTI) is a technique that generates 2D images of the change in the electromagnetic field inside the area covered by the radio transceivers to spot the presence and movements of animates (e.g., people, large animals) or...
Topics: Networking and Internet Architecture, Computing Research Repository, Emerging Technologies
Source: http://arxiv.org/abs/1407.8509
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5.0
Jun 30, 2018
06/18
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Christoph Baranec; Reed Riddle; Nicholas M. Law; A. N. Ramaprakash; Shriharsh Tendulkar; Kristina Hogstrom; Khanh Bui; Mahesh Burse; Pravin Chordia; Hillol Das; Richard Dekany; Shrinivas Kulkarni; Sujit Punnadi
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eye 5
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As new large-scale astronomical surveys greatly increase the number of objects targeted and discoveries made, the requirement for efficient follow-up observations is crucial. Adaptive optics imaging, which compensates for the image-blurring effects of Earth's turbulent atmosphere, is essential for these surveys, but the scarcity, complexity and high demand of current systems limits their availability for following up large numbers of targets. To address this need, we have engineered and...
Topics: Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1407.8179
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12
Jun 30, 2018
06/18
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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
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6.0
Jun 30, 2018
06/18
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Giovanni Amelino-Camelia; Leonardo Barcaroli; Giulia Gubitosi; Stefano Liberati; Niccoló Loret
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Finsler geometry is a well known generalization of Riemannian geometry which allows to account for a possibly non trivial structure of the space of configurations of relativistic particles. We here establish a link between Finsler geometry and the sort of models with curved momentum space and DSR-relativistic symmetries which have been recently of interest in the quantum-gravity literature. We use as case study the much-studied scenario which is inspired by the $\kappa$-Poincar\'e quantum...
Topics: High Energy Physics - Theory, General Relativity and Quantum Cosmology
Source: http://arxiv.org/abs/1407.8143
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4.0
Jun 30, 2018
06/18
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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
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6.0
Jun 30, 2018
06/18
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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
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8.0
Jun 30, 2018
06/18
by
Lewis P. G. Evans; Niall M. Adams; Christoforos Anagnostopoulos
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In many classification problems unlabelled data is abundant and a subset can be chosen for labelling. This defines the context of active learning (AL), where methods systematically select that subset, to improve a classifier by retraining. Given a classification problem, and a classifier trained on a small number of labelled examples, consider the selection of a single further example. This example will be labelled by the oracle and then used to retrain the classifier. This example selection...
Topics: Machine Learning, Computing Research Repository, Statistics, Learning
Source: http://arxiv.org/abs/1407.8042
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4.0
Jun 30, 2018
06/18
by
Liliana Apolinário; Néstor Armesto; Guilherme Milhano; Carlos A. Salgado
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The parton branching process is known to be modified in the presence of a medium. Colour decoherence processes are known to determine the process of energy loss when the density of the medium is large enough to break the correlations between partons emitted from the same parent. In order to improve existing calculations that consider eikonal trajectories for both the emitter and the hardest emitted parton, we provide in this work, the calculation of all finite energy corrections for the gluon...
Topics: High Energy Physics - Phenomenology, Nuclear Theory
Source: http://arxiv.org/abs/1407.7985
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4.0
Jun 30, 2018
06/18
by
Lin Chen; Nicole Megow; Kevin Schewior
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We consider the online resource minimization problem in which jobs with hard deadlines arrive online over time at their release dates. The task is to determine a feasible schedule on a minimum number of machines. We rigorously study this problem and derive various algorithms with small constant competitive ratios for interesting restricted problem variants. As the most important special case, we consider scheduling jobs with agreeable deadlines. We provide the first constant ratio competitive...
Topics: Data Structures and Algorithms, Computing Research Repository
Source: http://arxiv.org/abs/1407.7998
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9.0
Jun 30, 2018
06/18
by
M. Guedel; R. Dvorak; N. Erkaev; J. Kasting; M. Khodachenko; H. Lammer; E. Pilat-Lohinger; H. Rauer; I. Ribas; B. E. Wood
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eye 9
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With the discovery of hundreds of exoplanets and a potentially huge number of Earth-like planets waiting to be discovered, the conditions for their habitability have become a focal point in exoplanetary research. The classical picture of habitable zones primarily relies on the stellar flux allowing liquid water to exist on the surface of an Earth-like planet with a suitable atmosphere. However, numerous further stellar and planetary properties constrain habitability. Apart from...
Topics: Earth and Planetary Astrophysics, Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8174
4
4.0
Jun 30, 2018
06/18
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Mélissa Vieille Grosjean; Joanna Barros; Nicolas Delerue; Faissal Bakkali Taheri; George Doucas; Ivan Vasilyevich Konoplev; Armin Reichold; Christine Isabel Clarke
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The E-203 collaboration is testing a device on FACET at SLAC to measure the longitudinal profile of electron bunches using Smith-Purcell radiation. At FACET the electron bunches have an energy of 20~GeV and a duration of a few hundred femtoseconds. Smith-Purcell radiation is emitted when a charged particle passes close to the surface of a metallic grating. We have studied the stability of the measurement from pulse to pulse and the resolution of the measure depending on the number of gratings...
Topics: Accelerator Physics, Physics
Source: http://arxiv.org/abs/1407.8003
3
3.0
Jun 30, 2018
06/18
by
Natasa Djurdjevac Conrad; Ralf Banisch; Christof Schütte
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eye 3
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The problem of decomposing networks into modules (or clusters) has gained much attention in recent years, as it can account for a coarse-grained description of complex systems, often revealing functional subunits of these systems. A variety of module detection algorithms have been proposed, mostly oriented towards finding hard partitionings of undirected networks. Despite the increasing number of fuzzy clustering methods for directed networks, many of these approaches tend to neglect important...
Topics: Physics, Mathematics, Computing Research Repository, Physics and Society, Probability, Social and...
Source: http://arxiv.org/abs/1407.8039
4
4.0
Jun 30, 2018
06/18
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Neil G. Ibata; Rodrigo A. Ibata; Benoit Famaey; Geraint F. Lewis
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eye 4
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Recent work has shown that both the Milky Way and the Andromeda galaxies possess the unexpected property that their dwarf satellite galaxies are aligned in thin and kinematically coherent planar structures. It is now important to evaluate the incidence of such planar structures in the larger galactic population, since the Local Group may not be a sufficiently representative environment. Here we report that the measurement of the velocity of pairs of diametrically opposed galaxy satellites...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.8178
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4.0
Jun 30, 2018
06/18
by
Nektarios N. Lathiotakis; Nicole Helbig; Angel Rubio; Nikitas I. Gidopoulos
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Recently, we introduced (e-print arXiv:1407.7128) {\em local reduced density matrix functional theory} (local RDMFT), a theoretical scheme capable of incorporating static correlation effects in Kohn-Sham equations. Here, we apply local RDMFT to molecular systems of relatively large size, as a demonstration of its computational efficiency and its accuracy in predicting single-electron properties from the eigenvalue spectrum of the single-particle Hamiltonian with a local effective potential. We...
Topics: Physics, Chemical Physics
Source: http://arxiv.org/abs/1407.7939
3
3.0
Jun 30, 2018
06/18
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Nicola Bartolo; Marco Peloso; Angelo Ricciardone; Caner Unal
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eye 3
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Solid inflation is an effective field theory of inflation in which isotropy and homogeneity are accomplished via a specific combination of anisotropic sources (three scalar fields that individually break isotropy). This results in specific observational signatures that are not found in standard models of inflation: a non-trivial angular dependence for the squeezed bispectrum, and a possibly long period of anisotropic inflation (to drive inflation, the "solid" must be very insensitive...
Topics: High Energy Physics - Theory, High Energy Physics - Phenomenology, Astrophysics, General Relativity...
Source: http://arxiv.org/abs/1407.8053
3
3.0
Jun 30, 2018
06/18
by
Nicolas Bachelard; Carlos Garay; Julien Arlandis; Rachid Touzani; Patrick Sebbah
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In non-hermitian systems, the particular position at which two eigenstates coalesce under a variation of a parameter in the complex plane is called an exceptional point. A non-perturbative theory is proposed which describes the evolution of modes in 2D open dielectric systems when permittivity distribution is modified. We successfully test this theory in a 2D disordered system to predict the position in the parameter space of the exceptional point between two Anderson-localized states. We...
Topics: Physics, Optics
Source: http://arxiv.org/abs/1407.8220
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6.0
Jun 30, 2018
06/18
by
Nicolas Juillet
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The (left-)curtain coupling, introduced by Beiglb\"ock and the author is an extreme element of the set of "martingale" couplings between two real probability measures in convex order. It enjoys remarkable properties with respect to order relations and a minimisation problem inspired by the theory of optimal transport. An explicit representation and a number of further noteworthy attributes have recently been established by Henry-Labord\`ere and Touzi. In the present paper we...
Topics: Probability, Mathematics
Source: http://arxiv.org/abs/1407.8009
3
3.0
Jun 30, 2018
06/18
by
Nicolo' Facchi; Francesco Gringoli; Fabio Ricciato; Andrea Toma
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eye 3
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We address the problem of localising a mobile terminal ("blind" node) in unknown position from a set of "anchor" nodes in known positions. The proposed method does not require any form of node synchronisation nor measurement (or control) of the transmission times, which is difficult or anyway costly to achieve in practice. It relies exclusively on reception timestamps collected by the anchor nodes, according to their local clocks, that overhear packets transmitted by the...
Topics: Networking and Internet Architecture, Computing Research Repository
Source: http://arxiv.org/abs/1407.8056
3
3.0
Jun 30, 2018
06/18
by
Nicoló Lo Piparo; Mohsen Razavi
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eye 3
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The feasibility of trust-free long-haul quantum key distribution (QKD) networks is addressed. We combine measurement-device-independent QKD (MDI-QKD), as an access technology, with a quantum repeater setup, at the core of future quantum communication networks. This will provide a quantum link none of whose intermediary nodes need to be trusted, or, in our terminology, a trust-free QKD link. As the main figure of merit, we calculate the secret key generation rate when a particular probabilistic...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8025
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5.0
Jun 30, 2018
06/18
by
Nicoló Lo Piparo; Mohsen Razavi; Christiana Panayi
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Quantum memories are enabling devices for extending the reach of quantum key distribution (QKD) systems. The required specifications for memories are, however, often considered too demanding for available technologies. One can change this mindset by introducing memory-assisted measurement-device-independent QKD (MDI-QKD), which imposes less stringent conditions on the memory modules. It has been shown that, in the case of {\em fast} single-qubit memories, we can reach rates and distances not...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1407.8016
3
3.0
Jun 30, 2018
06/18
by
Noah Golowich; David Rolnick
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An acyclic set in a digraph is a set of vertices that induces an acyclic subgraph. In 2011, Harutyunyan conjectured that every planar digraph on $n$ vertices without directed 2-cycles possesses an acyclic set of size at least $3n/5$. We prove this conjecture for digraphs where every directed cycle has length at least 8. More generally, if $g$ is the length of the shortest directed cycle, we show that there exists an acyclic set of size at least $(1 - 3/g)n$.
Topics: Mathematics, Combinatorics
Source: http://arxiv.org/abs/1407.8045
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5.0
Jun 30, 2018
06/18
by
S. Kaviraj; M. Huertas-Company; S. Cohen; S. Peirani; R. A. Windhorst; R. W. O'Connell; J. Silk; M. A. Dopita; N. P. Hathi; A. M. Koekemoer; S. Mei; M. Rutkowski; R. E. Ryan; F. Shankar
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eye 5
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We study of the role of major mergers (mass ratios >1:4) in driving size growth in high-redshift (1 10^10.7 MSun SGs at z
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.8185
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4.0
Jun 30, 2018
06/18
by
Takako Endo; Norio Konno; Etsuo Segawa; Masato Takei
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We consider a one-dimensional space-inhomogeneous discrete time quantum walk. This model is the Hadamard walk with one defect at the origin which is different from the model introduced by Wojcik et al. [14]. We obtain a stationary measure of the model by solving the eigenvalue problem and an asymptotic behaviour of the return probability by the path counting approach. Moreover, we get the time-averaged limit measure using the space-time generating function method. The measure is symmetric for...
Topics: Mathematics, Mathematical Physics
Source: http://arxiv.org/abs/1407.8103
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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
