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Jun 29, 2018
06/18

by
Ian W Roxburgh

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The differences between the oscillation frequencies and uncertainty estimates of a star derived by different fitters can be large, sufficiently large so that, were one to find a stellar model that fitted one frequency set ($\chi^2\sim 1$), it does not fit an alternative set. I give 21 examples, comparing frequency sets in common between the Kepler Legacy project and frequency sets from Appourchaux et al (2014) and Davies et al (2015). For 16CygA&B the differences are large; the $\chi^2$ of...

Topics: Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1609.00568

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Jun 29, 2018
06/18

by
Vaitheeswaran G; Kanchana V; Zhang X; Ma Y; Svane A; Christensen NE

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A detailed study of the high-pressure structural properties, lattice dynamics and band structures of perovskite structured fluorides KZnF3, CsCaF3 and BaLiF3 has been carried out by means of density functional theory. The calculated structural properties including elastic constants and equation of state agree well with available experimental information. The phonon dispersion curves are in good agreement with available experimental inelastic neutron scattering data. The electronic structures of...

Topics: Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1609.00541

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Jun 29, 2018
06/18

by
Juan J. Ceron-Hurtado; Jian-hua He; Baojiu Li

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Modified gravity theories are a popular alternative to dark energy as a possible explanation for the observed accelerating cosmic expansion, and their cosmological tests are currently an active research field. Studies in recent years have been increasingly focused on testing these theories in the nonlinear regime, which is computationally demanding. Here we show that, under certain circumstances, a whole class of theories can be ruled out by using background cosmology alone. This is possible...

Topics: Astrophysics, Cosmology and Nongalactic Astrophysics

Source: http://arxiv.org/abs/1609.00532

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Jun 29, 2018
06/18

by
Chen-Yen Lai; Chih-Chun Chien

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While batteries offer electronic source and sink in electronic devices, atomic analogues of source and sink and their theoretical descriptions have been a challenge in cold-atom systems. Here we consider dynamically emerged local potentials as controllable source and sink for bosonic atoms. Although a sink potential can collect bosons in equlibrium and indicate its usefulness in the adiabatic limit, sudden switching of the potential exhibits low effectiveness in pushing bosons into it. This is...

Topics: Quantum Physics, Condensed Matter, Quantum Gases

Source: http://arxiv.org/abs/1609.00468

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Jun 29, 2018
06/18

by
Swati DebRoy; Olivia Prosper; Austin Mishoe; Anuj Mubayi

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Neglected tropical diseases (NTD), particularly vector-borne diseases (VBD), account for a large proportion of the global disease burden, and their control faces several challenges including diminishing human and financial resources for those distressed from such diseases. Visceral Leishmaniasis (VL), the second-largest parasitic killer in the world (after malaria) affects poor populations in endemic countries and causes considerable cost to the affected individuals and their society....

Topics: Quantitative Biology, Populations and Evolution

Source: http://arxiv.org/abs/1609.00788

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Jun 29, 2018
06/18

by
E. V. Hansen; L. Winslow

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Combining analysis from phonon signals and photon signals can powerfully reduce backgrounds for bolometer-based rare event searches. Anti-reflective coatings can significantly increase the performance of the secondary light-sensing bolometer in these experiments. As a first step toward these improvements, coatings of SiO$_2$, HfO$_2$, and TiO$_2$ on Ge and Si wafers were fabricated and characterized at room temperature and multiple angles of incidence.

Topics: Nuclear Experiment, Physics, Instrumentation and Detectors

Source: http://arxiv.org/abs/1609.00720

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Jun 29, 2018
06/18

by
Thiago Colla; Matheus Girotto; Alexandre P. dos Santos; Yan Levin

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We study, using Density Functional theory and Monte Carlo simulations, aqueous electrolyte solutions between charged infinite planar surfaces, in a contact with a bulk salt reservoir. In agreement with recent experimental observations [Z. Luo et al., Nat. Comm. 6, 6358 (2015)], we find that the confined electrolyte lacks local charge neutrality. We show that a Density Functional Theory (DFT) based on a bulk- HNC expansion properly accounts for strong electrostatic correlations and allows us to...

Topics: Soft Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1609.00619

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Jun 29, 2018
06/18

by
H. Birkan Yilmaz; Gee-Yong Suk; Chan-Byoung Chae

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In a diffusion-based molecular communication system, molecules are employed to convey information. When propagation and reception processes are considered in a framework of first passage processes, we need to focus on absorbing receivers. For this kind of molecular communication system, the characteristics of the channel is also affected by the shape of the transmitter. In the literature, most studies focus on systems with a point transmitter due to circular symmetry. In this letter, we address...

Topics: Information Theory, Emerging Technologies, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1609.00586

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Jun 29, 2018
06/18

by
Marcel Reutzel; Niels Münster; Marcus A. Lipponer; Christian Länger; Ulrich Höfer; Ulrich Koert; Michael Dürr

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Controlled organic functionalization of silicon surfaces as integral part of semiconductor technology offers new perspectives for a wide range of applications. The high reactivity of the silicon dangling bonds, however, presents a major hindrance for the first basic reaction step of such a functionalization, i.e., the chemoselective attachment of bifunctional organic molecules on the pristine silicon surface. We overcome this problem by employing cyclooctyne as the major building block of our...

Topics: Chemical Physics, Materials Science, Condensed Matter, Physics

Source: http://arxiv.org/abs/1609.00529

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Jun 29, 2018
06/18

by
L. Dykes; S. Noschese; L. Reichel

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Circulant preconditioners are commonly used to accelerate the rate of convergence of iterative methods when solving linear systems of equations with a Toeplitz matrix. Block extensions that can be applied when the system has a block Toeplitz matrix with Toeplitz blocks also have been developed. This paper is concerned with preconditioning of linear systems of equations with a symmetric block Toeplitz matrix with symmetric Toeplitz blocks that stem from the discretization of a linear ill-posed...

Topics: Numerical Analysis, Mathematics

Source: http://arxiv.org/abs/1609.00573

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Jun 29, 2018
06/18

by
Senping Luo; Juncheng Wei; Wenming Zou

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We classify the stable solutions (positive or sign-changing, radial or not) to the following nonlocal Lane-Emden equation: $(-\Delta)^s u=|u|^{p-1}u$ in $\mathbb{R}^n$ for $2

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1609.00705

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Jun 29, 2018
06/18

by
Jingfang Fan; Jun Meng; Yosef Ashkenazy; Shlomo Havlin

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We construct directed and weighted climate networks based on near surface air temperature to investigate the global impacts of El Nino and La Nina. We find that regions which are characterized by higher positive or negative network in weighted links, are exhibiting stronger correlations with the El Nino basin and are warmer or cooler during El Nino or La Nina periods. These stronger in-weighted activities are found to be concentrated in localized areas, as compared to non-El Nino periods,...

Topics: Geophysics, Atmospheric and Oceanic Physics, Physics

Source: http://arxiv.org/abs/1609.00547

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Jun 29, 2018
06/18

by
Oleg V. Egorov; Tatiana A. Lozinskaya; Alexei V. Moiseev; Yuri A. Shchekinov

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We report a detailed analysis of all regions of current star formation in the walls of the supergiant HI shell (SGS) in the galaxy Holmberg II based on observations with a scanning Fabry-Perot interferometer at the 6-m SAO RAS telescope. We compare the structure and kinematics of ionized gas with that of atomic hydrogen and with the stellar population of the SGS. Our deep H$\alpha$ images and archival images taken by the HST demonstrate that current star formation episodes are larger and more...

Topics: Astrophysics, Astrophysics of Galaxies

Source: http://arxiv.org/abs/1609.00650

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Jun 29, 2018
06/18

by
Sergey Bravyi; David Gosset

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We give a quasi-polynomial time classical algorithm for estimating the ground state energy and for computing low energy states of quantum impurity models. Such models describe a bath of free fermions coupled to a small interacting subsystem called an impurity. The full system consists of $n$ fermionic modes and has a Hamiltonian $H=H_0+H_{imp}$, where $H_0$ is quadratic in creation-annihilation operators and $H_{imp}$ is an arbitrary Hamiltonian acting on a subset of $O(1)$ modes. We show that...

Topics: Mathematics, Quantum Physics, Condensed Matter, Mathematical Physics, Strongly Correlated Electrons

Source: http://arxiv.org/abs/1609.00735

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Jun 29, 2018
06/18

by
Jonathan Law; Darren Wilkinson

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Data is rapidly increasing in volume and velocity and the Internet of Things (IoT) is one important source of this data. The IoT is a collection of connected devices (things) which are constantly recording data from their surroundings using on-board sensors. These devices can record and stream data to the cloud at a very high rate, leading to high storage and analysis costs. In order to ameliorate these costs, we can analyse the data as it arrives in a stream to learn about the underlying...

Topics: Methodology, Statistics

Source: http://arxiv.org/abs/1609.00635

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Jun 29, 2018
06/18

by
Rajesh Gopakumar; Apratim Kaviraj; Kallol Sen; Aninda Sinha

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We propose a new approach towards analytically solving for the dynamical content of Conformal Field Theories (CFTs) using the bootstrap philosophy. This combines the original bootstrap idea of Polyakov with the modern technology of the Mellin representation of CFT amplitudes. We employ exchange Witten diagrams with built in crossing symmetry as our basic building blocks rather than the conventional conformal blocks in a particular channel. Demanding consistency with the operator product...

Topics: High Energy Physics - Theory, High Energy Physics - Phenomenology, Statistical Mechanics, Condensed...

Source: http://arxiv.org/abs/1609.00572

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Jun 29, 2018
06/18

by
N. Itagaki

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Consistent description of 12C and 16O has been a long standing problem of microscopic alpha cluster models, where the wave function is fully antisymmetrized and the effective interaction is applied not between alpha clusters but between nucleons. When the effective interaction is designed to reproduce the binding energy of 16O (four alpha), the binding energy of 12C (three alpha) becomes underbound by about 10 MeV. In the present study, by taking into account the coupling with the jj-coupling...

Topic: Nuclear Theory

Source: http://arxiv.org/abs/1609.00466

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Jun 29, 2018
06/18

by
Cristiano Porciani

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Constrained realisations of Gaussian random fields are used in cosmology to design special initial conditions for numerical simulations. We review this approach and its application to density peaks providing several worked-out examples. We then critically discuss the recent proposal to use constrained realisations to modify the linear density field within and around the Lagrangian patches that form dark-matter haloes. The ambitious concept is to forge `genetically modified' haloes with some...

Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, Astrophysics of Galaxies

Source: http://arxiv.org/abs/1609.00730

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Jun 29, 2018
06/18

by
Victor D. Lakhno

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It is shown that Cooper pairs are a solution of the bipolaron problem for model Fr\"{o}hlich Hamiltonian. The total energy of a pair for the initial Fr\"{o}hlich Hamiltonian is found. Differences between the solutions for the model and initial two-particle problems are discussed.

Topics: Condensed Matter, Quantum Gases, Strongly Correlated Electrons

Source: http://arxiv.org/abs/1609.05121

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Jun 29, 2018
06/18

by
Guillaume Lajoie; Nedialko I. Krouchev; John F. Kalaska; Adrienne L. Fairhall; Eberhard E. Fetz

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Experiments show that spike-triggered stimulation performed with Bidirectional Brain-Computer-Interfaces (BBCI) can artificially strengthen connections between separate neural sites in motor cortex (MC). What are the neuronal mechanisms responsible for these changes and how does targeted stimulation by a BBCI shape population-level synaptic connectivity? The present work describes a recurrent neural network model with probabilistic spiking mechanisms and plastic synapses capable of capturing...

Topics: Quantitative Biology, Neurons and Cognition

Source: http://arxiv.org/abs/1609.00762

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Jun 29, 2018
06/18

by
Marius Tarnauceanu; Mihai-Silviu Lazorec

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In this paper we introduce and study the concept of cyclic subgroup commutativity degree of a finite group $G$. This quantity measures the probability of two random cyclic subgroups of $G$ commuting. Explicit formulas are obtained for some particular classes of groups. A criterion for a finite group to be an Iwasawa group is also presented.

Topics: Group Theory, Mathematics

Source: http://arxiv.org/abs/1609.00476