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Strong-Field Gravity Tests with the Double Pulsar

Physical Review X 2021年第4期11卷 041050-041050页

作者： M. Kramer I. H. Stairs R. N. Manchester N. Wex A. T. Deller W. A. Coles M. Ali M. Burgay F. Camilo I. Cognard T. Damour G. Desvignes R. D. Ferdman P. C. C. Freire S. Grondin L. Guillemot G. B. Hobbs G. Janssen R. Karuppusamy D. R. Lorimer A. G. Lyne J. W. McKee M. McLaughlin L. E. Münch B. B. P. Perera N. Pol A. Possenti J. Sarkissian B. W. Stappers G. Theureau Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-53121 Bonn Germany Jodrell Bank Centre for Astrophysics The University of Manchester Oxford M13 9PL United Kingdom Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road Vancouver British Columbia V6T 1Z1 Canada Australia Telescope National Facility CSIRO Space and Astronomy P.O. Box 76 Epping New South Wales 1710 Australia Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 Hawthorn Victoria 3122 Australia ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) P.O. Box 218 Hawthorn Victoria 3122 Australia Electrical and Computer Engineering University of California at San Diego La Jolla California 92093 USA Perimeter Institute for Theoretical Physics 31 Caroline Street North Waterloo Ontario Canada N2L 2Y5 INAF-Osservatorio Astronomico di Cagliari Via della Scienza 5 09047 Selargius (CA) Italy South African Radio Astronomy Observatory 2 Fir Street Black River Park Observatory 7925 South Africa Laboratoire de Physique et Chimie de l’Environnement et de l’Espace LPC2E CNRS-Université d’Orléans F-45071 Orléans France Station de Radioastronomie de Nançay Observatoire de Paris CNRS/INSU F-18330 Nançay France Institut des Hautes Études Scientifiques 91440 Bures-sur-Yvette France LESIA Observatoire de Paris Universit PSL CNRS Sorbonne Université Universit de Paris 5 Place Jules Janssen 92195 Meudon France Faculty of Science University of East Anglia Norwich NR4 7TJ United Kingdom David A. Dunlap Department of Astronomy and Astrophysics University of Toronto 50 St. George Street Toronto Ontario M5S 3H4 Canada ASTRON Netherlands Institute for Radio Astronomy Oude Hoogeveensedijk 4 7991 PD Dwingeloo Netherlands Department of Astrophysics/IMAPP Radboud University P.O. Box 9010 6500 GL Nijmegen Netherlands Department of Physics and Astronomy West Virginia University P.O. Box 6315 Morgantown West Virginia

Continued timing observations of the double pulsar PSR J0737–3039A/B, which consists of two active radio pulsars (A and B) that orbit each other with a period of 2.45 h in a mildly eccentric (e=0.088) binary system, have led to large improvements in the measurement of relativistic effects in this system. With a 16-yr data span, the results enable precision tests of theories of gravity for strongly self-gravitating bodies and also reveal new relativistic effects that have been expected but are now observed for the first time. These include effects of light propagation in strong gravitational fields which are currently not testable by any other method. In particular, we observe the effects of retardation and aberrational light bending that allow determination of the spin direction of the pulsar. In total, we detect seven post-Keplerian parameters in this system, more than for any other known binary pulsar. For some of these effects, the measurement precision is now so high that for the first time we have to take higher-order contributions into account. These include the contribution of the A pulsar’s effective mass loss (due to spin-down) to the observed orbital period decay, a relativistic deformation of the orbit, and the effects of the equation of state of superdense matter on the observed post-Keplerian parameters via relativistic spin-orbit coupling. We discuss the implications of our findings, including those for the moment of inertia of neutron stars, and present the currently most precise test of general relativity’s quadrupolar description of gravitational waves, validating the prediction of general relativity at a level of 1.3×10−4 with 95% confidence. We demonstrate the utility of the double pulsar for tests of alternative theories of gravity by focusing on two specific examples and also discuss some implications of the observations for studies of the interstellar medium and models for the formation of the double pulsar system. Finally, we provide context t

关键词： Alternative gravity theories Electromagnetic radiation astronomy Experimental studies of gravity General relativity Gravitation Gravitational wave detection Gravitational wave sources Gravitational waves Radio, microwave, & sub-mm astronomy Binary stars Interstellar medium Neutron stars & pulsars

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Model of knowledge transfer within an organisation

arXiv

引用

arXiv 2017年

作者： Kowalska-Styczeń, Agnieszka Malarz, Krzysztof Paradowski, Kamil Silesian University of Technology Faculty of Organisation and Management ul. Roosevelta 26/28 Zabrze41-800 Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakow30-059 Poland

Many studies show that the acquisition of knowledge is the key to build competitive advantage of companies. We propose a simple model of knowledge transfer within the organization and we implement the proposed model using cellular automata technique. In this paper the organisation is considered in the context of complex systems. In this perspective, the main role in organisation is played by the network of informal contacts and the distributed leadership. The goal of this paper is to check which factors influence the efficiency and effectiveness of knowledge transfer. Our studies indicate a significant role of initial concentration of chunks of knowledge for knowledge transfer process, and the results suggest taking action in the organisation to shorten the distance (social distance) between people with different levels of knowledge, or working out incentives to share knowledge. Copyright © 2017, The Authors. All rights reserved.

关键词： Knowledge management

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First observation of the cosmic ray shadow of the Moon and the Sun with KM3NeT/ORCA

arXiv

引用

arXiv 2022年

作者： Aiello, S. Albert, A. Alves Garre, S. Aly, Z. Ambrosone, A. Ameli, F. Andre, M. Anghinolfi, M. Anguita, M. Ardid, M. Ardid, S. Aublin, J. Bagatelas, C. Bailly-Salins, L. Baret, B. Basegmez du Pree, S. Becherini, Y. Bendahman, M. Benfenati, F. Berbee, E. Bertin, V. Biagi, S. Boettcher, M. Bou Cabo, M. Boumaaza, J. Bouta, M. Bouwhuis, M. Bozza, C. Brânzaş, H. Bruijn, R. Brunner, J. Bruno, R. Buis, E. Buompane, R. Busto, J. Caiffi, B. Calvo, D. Campion, S. Capone, A. Carenini, F. Carretero, V. Castaldi, P. Celli, S. Cerisy, L. Chabab, M. Chau, N. Chen, A. Cherkaoui El Moursli, R. Cherubini, S. Chiarella, V. Chiarusi, T. Circella, M. Cocimano, R. Coelho, J.A.B. Coleiro, A. Coniglione, R. Coyle, P. Creusot, A. Cruz, A. Cuttone, G. Dallier, R. Darras, Y. De Benedittis, A. De Martino, B. Del Burgo, R. Di Palma, I. Dìaz, A.F. Diego-Tortosa, D. Distefano, C. Domi, A. Donzaud, C. Dornic, D. Dörr, M. Drakopoulou, E. Drouhin, D. Eberl, T. Eddyamoui, A. van Eeden, T. Eff, M. van Eijk, D. El Bojaddaini, I. El Hedri, S. Enzenhöfer, A. Espinosa, V. Ferrara, G. Filipović, M.D. Filippini, F. Fusco, L.A. Gabriel, J. Gal, T. García Méndez, J. Garcia Soto, A. Garufi, F. Gatius Oliver, C. Geißelbrecht, N. Gialanella, L. Giorgio, E. Girardi, A. Goos, I. Gozzini, S.R. Gracia, R. Graf, K. Guderian, D. Guidi, C. Guillon, B. Gutiérrez, M. Haegel, L. van Haren, H. Heijboer, A. Hekalo, A. Hennig, L. Hernández-Rey, J.J. Huang, F. Idrissi Ibnsalih, W. Illuminati, G. James, C.W. Janezashvili, D. de Jong, M. de Jong, P. Jung, B.J. Kalaczyński, P. Kalekin, O. Katz, U.F. Khan Chowdhury, N.R. Kistauri, G. van der Knaap, F. Kooijman, P. Kouchner, A. Kulikovskiy, V. Labalme, M. Lahmann, R. Lakhal, A. Lamoureux, M. Larosa, G. Lastoria, C. Lazo, A. Le Breton, R. Le Stum, S. Lehaut, G. Leonora, E. Lessing, N. Levi, G. Liang, S. Lindsey Clark, M. Longhitano, F. Maderer, L. Majumdar, J. Mańczak, J. Margiotta, A. Marinelli, A. Markou, C. Martin, L. INFN Sezione di Catania Via Santa Sofia 64 Catania95123 Italy Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France IFIC - Instituto de Física Corpuscular CSIC - Universitat de València c/Catedrático José Beltrán 2 Valencia Paterna46980 Spain Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy Università di Napoli "Federico II" Dip. Scienze Fisiche "E. Pancini" Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy INFN Sezione di Roma Piazzale Aldo Moro 2 Roma00185 Italy Universitat Politècnica de Catalunya Laboratori d'Aplicacions Bioacústiques Centre Tecnològic de Vilanova i la Geltrú Avda. Rambla Exposició s/n Vilanova i la Geltrú08800 Spain INFN Sezione di Genova Via Dodecaneso 33 Genova16146 Italy University of Granada Dept. of Computer Architecture and Technology CITIC Granada18071 Spain Universitat Politècnica de València Instituto de Investigación para la Gestión Integrada de las Zonas Costeras C/Paranimf 1 Gandia46730 Spain Université de Paris CNRS Astroparticule et Cosmologie ParisF-75013 France NCSR Demokritos Institute of Nuclear and Particle Physics Ag. Paraskevi Attikis Athens15310 Greece LPC CAEN A02182036 6 boulevard Maréchal Juin Caen14050 France Nikhef National Institute for Subatomic Physics PO Box 41882 Amsterdam1009 DB Netherlands University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 RabatR.P. 10000 Morocco INFN Sezione di Bologna v.le C. Berti-Pichat 6/2 Bologna40127 Italy Università di Bologna Dipartimento di Fisica e Astronomia v.le C. Berti-Pichat 6/2 Bologna40127 Italy INFN Laboratori Nazionali del Sud Via S. Sofia 62 Catania95123 Italy North-West University Centre for Space Research Private Bag X6001 Potchefstroom2520 South Africa Instituto Español de Oceanografía Unidad Mixta IEO-UPV C/Paranimf 1 Gandia46730

This article reports the first observation of the Moon and the Sun shadows in the sky distribution of cosmic-ray induced muons measured by the KM3NeT/ORCA detector. The analysed data-taking period spans from February 2020 to November 2021, when the detector had 6 Detection Units deployed at the bottom of the Mediterranean Sea, each composed of 18 Digital Optical Modules. The shadows induced by the Moon and the Sun were detected at their nominal position with a statistical significance of 4.2σ and 6.2σ, and an angular resolution of σres = 0.49◦ and σres = 0.66◦, respectively, consistent with the prediction of 0.53◦ from simulations. This early result confirms the effectiveness of the detector calibration, in time, position and orientation and the accuracy of the event direction reconstruction. This also demonstrates the performance and the competitiveness of the detector in terms of pointing accuracy and angular resolution. Copyright © 2022, The Authors. All rights reserved.

关键词： Moon

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Influence of fast emissions and statistical de-excitation on the isospin transport ratio

arXiv

引用

arXiv 2020年

作者： Camaiani, Alberto Piantelli, S. Ono, A. Casini, G. Borderie, B. Bougault, R. Ciampi, C. Dueñas, J.A. Frosin, C. Frankland, J.D. Gruyer, D. LeNeindre, N. Lombardo, I. Mantovani, G. Ottanelli, P. Parlog, M. Pasquali, G. Upadhyaya, S. Valdré, S. Verde, G. Vient, E. Dipartimento di Fisica Università di Firenze Italy INFN Sezione di Firenze Italy Department of Physics Tohoku University Sendai980-8578 Japan Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay91405 France Normandie Université ENSICAEN UNICAEN CNRS/IN2P3 LPC Caen Caen14000 France Depto. de Ingeniería Eléctrica Centro de Estudios Avanzados en Física Matemáticas y Computación Universidad de Huelva Huelva21007 Spain GANIL CEA/DRF-CNRS/IN2P3 Caen14076 France INFN Sezione di Catania Catania95123 Italy INFN Laboratori Nazionali di Legnaro Legnaro35020 Italy Dipartimento di Fisica Università di Padova Padova35131 Italy Universidade de Santiago de Compostela Santiago de Compostela15705 Spain Bucharest MagureleRO-077125 Romania Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kracow30-348 Poland

Isospin transport ratio is a powerful method to estimate the neutron-proton (n-p) equilibration in heavy-ion collisions, and extensively used to obtain information on the asy-stiffness of the nuclear Equation of State. In fact such a ratio is expected to bypass any perturbations introducing a linear transformation of the chosen observable. In particular, it is supposed to overcome contributions due to emission, either of dynamical or statistical nature, from the primary fragments formed during the collisions. In this paper we explore the validity of this assumption, looking at the quasi-projectile n-p ratio (N/Z) in peripheral and semi-peripheral events for Ca+Ca reactions at 35 MeV/nucleon, simulated via the Antisymmetrized Molecular Dynamics transport model, coupled to different statistical decay codes. The statistical de-excitation of the primary fragments introduces a linear transformation at relatively high excitation energies (above 2 MeV/nucleon) when the residue approaches the Evaporation Attractor Line, while some effect is produced at lower excitation energies due to the occurrence of some non-linearities. As for fast emissions after the end of the projectile-target interaction it is shown that they introduce a non-linear transformation too. Copyright © 2020, The Authors. All rights reserved.

关键词： Linear transformations

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Cognitive Keys in Personalized Cryptography

Cognitive Keys in Personalized Cryptography

引用

International Conference on Advanced Information Networking and Applications (AINA)

作者： Marek R. Ogiela Lidia Ogiela Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland AGH University of Science and Technology Cryptography and Cognitive Informatics Research Group Krakow Poland

ISBN: (纸本)9781509060306

In this paper will be described a new way of using cognitive approaches in personalized cryptography algorithms. Personal information may be used in creation advanced security protocols, as well as personal keys for cryptosystems, and information encoding procedures. Such protocols may play important role in advanced secure management applications. Additionally some behavioral features allow to generate unique sequences, which also may be used in modern cryptographic application. Such possibilities will be described in this paper.

关键词： Cryptography Information systems Feature extraction Semantics Protocols Visualization

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KM3NeT Broadcast Optical Data Transport System

arXiv

引用

arXiv 2022年

作者： Aiello, S. Albert, A. Garre, S. Alves Aly, Z. Ambrosone, A. Ameli, F. Andre, M. Anghinolfi, M. Anguita, M. Ardid, M. Ardid, S. Aublin, J. Bagatelas, C. Bailly-Salins, L. Baret, B. du Pree, S. Basegmez Becherini, Y. Bendahman, M. Benfenati, F. Berbee, E. Bertin, V. Biagi, S. Boettcher, M. Cabo, M. Bou Boumaaza, J. Bouta, M. Bouwhuis, M. Bozza, C. Brânzaş, H. Bruijn, R. Brunner, J. Bruno, R. Buis, E. Buompane, R. Busto, J. Caiffi, B. Calvo, D. Campion, S. Capone, A. Carenini, F. Carretero, V. Castaldi, P. Celli, S. Cerisy, L. Chabab, M. Chau, N. Chen, A. El Moursli, R. Cherkaoui Cherubini, S. Chiarella, V. Chiarusi, T. Circella, M. Cocimano, R. Coelho, J.A.B. Coleiro, A. Coniglione, R. Coyle, P. Creusot, A. Cruz, A. Cuttone, G. D’Amico, A. Dallier, R. Darras, Y. De Benedittis, A. De Martino, B. Del Burgo, R. Di Palma, I. Díaz, A.F. Diego-Tortosa, D. Distefano, C. Domi, A. Donzaud, C. Dornic, D. Dörr, M. Drakopoulou, E. Drouhin, D. Eberl, T. Eddyamoui, A. van Eeden, T. Eff, M. van Eijk, D. El Bojaddaini, I. El Hedri, S. Enzenhöfer, A. Espinosa, V. Ferrara, G. Filipović, M.D. Filippini, F. Fusco, L.A. Gabriel, J. Gal, T. Méndez, J. García Soto, A. Garcia Garufi, F. Oliver, C. Gatius Geißelbrecht, N. Gialanella, L. Giorgio, E. Girardi, A. Goos, I. Gozzini, S.R. Gracia, R. Graf, K. Guderian, D. Guidi, C. Guillon, B. Gutiérrez, M. Haegel, L. van Haren, H. Heijboer, A. Hekalo, A. Hennig, L. Hernández-Rey, J.J. Huang, F. Ibnsalih, W. Idrissi Illuminati, G. James, C.W. Janezashvili, D. de Jong, M. de Jong, P. Jung, B.J. Kalaczyński, P. Kalekin, O. Katz, U.F. Chowdhury, N.R. Khan Kistauri, G. van der Knaap, F. Kooijman, P. Kouchner, A. Kulikovskiy, V. Labalme, M. Lahmann, R. Lakhal, A. Lamoureux, M. Larosa, G. Lastoria, C. Lazo, A. Le Breton, R. Le Stum, S. Lehaut, G. Leonora, E. Lessing, N. Levi, G. Liang, S. Clark, M. Lindsey Longhitano, F. Maderer, L. Majumdar, J. Mańczak, J. Margiotta, A. Marinelli, A. Markou, C. Martin, L. INFN Sezione di Catania Via Santa Sofia 64 Catania95123 Italy Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France c/Catedrático José Beltrán 2 Paterna Valencia46980 Spain Aix Marseille Univ CNRS IN2P3 CPPM Marseille France INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy Università di Napoli "Federico II" Dip. Scienze Fisiche "E. Pancini" Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy INFN Sezione di Roma Piazzale Aldo Moro 2 Roma00185 Italy Universitat Politècnica de Catalunya Laboratori d’Aplicacions Bioacústiques Centre Tecnològic de Vilanova i la Geltrú Avda. Rambla Exposició s/n Vilanova i la Geltrú08800 Spain INFN Sezione di Genova Via Dodecaneso 33 Genova16146 Italy University of Granada Dept. of Computer Architecture and Technology/CITIC Granada18071 Spain Universitat Politècnica de València Instituto de Investigación para la Gestión Integrada de las Zonas Costeras C/ Paranimf 1 Gandia46730 Spain Université de Paris CNRS Astroparticule et Cosmologie ParisF-75013 France NCSR Demokritos Institute of Nuclear and Particle Physics Ag. Paraskevi Attikis Athens15310 Greece LPC CAEN Normandie Univ ENSICAEN UNICAEN CNRS IN2P3 6 boulevard Maréchal Juin Caen14050 France Nikhef National Institute for Subatomic Physics PO Box 41882 Amsterdam1009 DB Netherlands University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 RabatR.P. 10000 Morocco INFN Sezione di Bologna v.le C. Berti-Pichat 6/2 Bologna40127 Italy Università di Bologna Dipartimento di Fisica e Astronomia v.le C. Berti-Pichat 6/2 Bologna40127 Italy INFN Laboratori Nazionali del Sud Via S. Sofia 62 Catania95123 Italy North-West University Centre for Space Research Private Bag X6001 Potchefstroom2520 South Africa Instituto Español de Oceanografía Unidad Mixta IEO-UPV C/ Paranimf 1 Gandia46730 Spain University Mohammed I Fac

The optical data transport system of the KM3NeT neutrino telescope at the bottom of the Mediterranean Sea will provide each of the more than 6000 optical modules in the detector arrays with a point-to-point optical connection to the control stations onshore. The ARCA and ORCA detectors of KM3NeT are being installed at a depth of about 3500 m and 2500 m, respectively;their distance to the control stations is about 100 kilometers and 40 kilometers. The expected maximum data rate is 200 Mbps per optical module. The implemented optical data transport system matches the layouts of the networks of electro-optical cables and junction boxes in the deep sea. For efficient use of the fibres in the system the technology of Dense Wavelength Division Multiplexing is applied. The performance of the optical system in terms of measured bit error rates, optical budget and the next steps in the implementation of the system are presented. © 2022, CC BY.

关键词： Optical systems

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Modeling a traffic remapping attack game in a multi-hop ad hoc network

arXiv

引用

arXiv 2017年

作者： Konorski, Jerzy Szott, Szymon Faculty of Electronics Telecommunications and Informatics Gdansk University of Technology Gdansk Poland AGH University of Science and Technology Faculty of Computer Science Electronics and Telecommunications Krakow Poland

In multi-hop ad hoc networks, selfish nodes may unduly acquire high quality of service (QoS) by assigning higher priority to source packets and lower priority to transit packets. Such traffic remapping attacks (TRAs) are cheap to launch, impossible to prevent, hard to detect, and harmful to non-selfish nodes. While studied mostly in single-hop wireless network settings, TRAs have resisted analysis in multi-hop settings. In this paper we offer a game-theoretic approach: We derive a formal model of opportunistic TRAs, define a TRA game with a heuristic rank-based payoff function, and propose a boundedly rational multistage attack strategy that both selfish and non-selfish nodes are free to use. Thus non-selfish nodes are allowed to respond in kind to selfish ones. We characterize the form of equilibrium that the multistage play reaches and verify via simulation that it often coincides with a Nash equilibrium in which harmful TRAs are curbed in the first place, whereas harmless ones need not be. 91A06, 91A10, 91A80 Copyright © 2017, The Authors. All rights reserved.

关键词： Game theory

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Detection of Cross-Correlation between Gravitational Lensing and γ Rays

引用

Physical Review Letters 2020年第10期124卷 101102-101102页

作者： S. Ammazzalorso D. Gruen M. Regis S. Camera S. Ando N. Fornengo K. Bechtol S. L. Bridle A. Choi T. F. Eifler M. Gatti N. MacCrann Y. Omori S. Samuroff E. Sheldon M. A. Troxel J. Zuntz M. Carrasco Kind J. Annis S. Avila E. Bertin D. Brooks D. L. Burke A. Carnero Rosell J. Carretero F. J. Castander M. Costanzi L. N. da Costa J. De Vicente S. Desai H. T. Diehl J. P. Dietrich P. Doel S. Everett B. Flaugher P. Fosalba J. García-Bellido E. Gaztanaga D. W. Gerdes T. Giannantonio D. A. Goldstein R. A. Gruendl G. Gutierrez D. L. Hollowood K. Honscheid D. J. James M. Jarvis T. Jeltema S. Kent N. Kuropatkin O. Lahav T. S. Li M. Lima M. A. G. Maia J. L. Marshall P. Melchior F. Menanteau R. Miquel R. L. C. Ogando A. Palmese A. A. Plazas A. K. Romer A. Roodman E. S. Rykoff C. Sánchez E. Sanchez V. Scarpine S. Serrano I. Sevilla-Noarbe M. Smith M. Soares-Santos F. Sobreira E. Suchyta M. E. C. Swanson G. Tarle D. Thomas V. Vikram Y. Zhang Dipartimento di Fisica Università degli Studi di Torino via Pietro Giuria 1 10125 Torino Italy INFN—Istituto Nazionale di Fisica Nucleare Sezione di Torino via Pietro Giuria 1 10125 Torino Italy Kavli Institute for Particle Astrophysics and Cosmology P. O. Box 2450 Stanford University Stanford California 94305 USA SLAC National Accelerator Laboratory Menlo Park California 94025 USA INAF—Istituto Nazionale di Astrofisica Osservatorio Astrofisico di Torino strada Osservatorio 20 10025 Pino Torinese Italy Department of Physics and Astronomy University of the Western Cape Cape Town 7535 South Africa GRAPPA Institute University of Amsterdam 1098 XH Amsterdam The Netherlands Kavli Institute for the Physics and Mathematics of the Universe University of Tokyo Kashiwa Chiba 277-8583 Japan LSST 933 North Cherry Avenue Tucson Arizona 85721 USA Physics Department 2320 Chamberlin Hall University of Wisconsin-Madison 1150 University Avenue Madison Wisconsin 53706-1390 USA Jodrell Bank Center for Astrophysics School of Physics and Astronomy University of Manchester Oxford Road Manchester M13 9PL United Kingdom Center for Cosmology and Astro-Particle Physics The Ohio State University Columbus Ohio 43210 USA Department of Astronomy and Steward Observatory University of Arizona 933 North Cherry Avenue Tucson Arizona 85721-0065 USA Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena California 91109 USA Institut de Física d’Altes Energies (IFAE) The Barcelona Institute of Science and Technology Campus UAB 08193 Bellaterra Barcelona Spain Department of Physics The Ohio State University Columbus Ohio 43210 USA Department of Physics Carnegie Mellon University Pittsburgh Pennsylvania 15312 USA Brookhaven National Laboratory Building 510 Upton New York 11973 USA Department of Physics Duke University Durham North Carolina 27708 USA Institute for Astronomy University of Edinburgh Edinburgh EH9 3HJ United Kingdom Departme

In recent years, many γ-ray sources have been identified, yet the unresolved component hosts valuable information on the faintest emission. In order to extract it, a cross-correlation with gravitational tracers of matter in the Universe has been shown to be a promising tool. We report here the first identification of a cross-correlation signal between γ rays and the distribution of mass in the Universe probed by weak gravitational lensing. We use data from the Dark Energy Survey Y1 weak lensing data and the Fermi Large Area Telescope 9-yr γ-ray data, obtaining a signal-to-noise ratio of 5.3. The signal is mostly localized at small angular scales and high γ-ray energies, with a hint of correlation at extended separation. Blazar emission is likely the origin of the small-scale effect. We investigate implications of the large-scale component in terms of astrophysical sources and particle dark matter emission.

关键词： Gamma ray astronomy Large scale structure of the Universe Particle dark matter

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Freezeout systematics due to the hadron spectrum

arXiv

引用

arXiv 2017年

作者： Chatterjee, Sandeep Mishra, Debadeepti Mohanty, Bedangadas Samanta, Subhasis AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakow30-059 Poland School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India

We investigate systematics of the freezeout surface in heavy ion collisions due to the hadron spectrum. The role of suspected resonance states that are yet to be confirmed experimentally in identifying the freezeout surface has been investigated. We have studied two different freezeout schemes - unified freezeout scheme where all hadrons are assumed to freezeout at the same thermal state and a flavor dependent sequential freezeout scheme with different freezeout thermal states for hadrons with or without valence strange quarks. The data of mean hadron yields as well as scaled variance of net proton and net charge distributions have been analysed. We find the freezeout temperature T to drop by ∼ 5% while the dimensionless freezeout parameters µB/T and V T3 (µB and V are the baryon chemical potential and the volume at freezeout respectively) are insensitive to the systematics of the input hadron spectrum. The observed hint of flavor hierarchy in T and V T3 with only confirmed resonances survives the systematics of the hadron spectrum. It is more prominent between √sNN ∼ 10 − 100 GeV where the maximum hierarchy in T ∼ 10% and V T3 ∼ 40%. However, the uncertainties in the thermal parameters due to the systematics of the hadron spectrum and their decay properties do not allow us to make a quantitative estimate of the flavor hierarchy yet. Copyright © 2017, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Application of Surface Plasmon Resonance Sensor with Polypyrrole Chitosan Graphene Oxide layer to Detect the Napropamide 5

Application of Surface Plasmon Resonance Sensor with Polypyr...

引用

5th International Conference on Fundamental and applied sciences, ICFAS 2018

作者： Sadrolhosseini, Amir Reza Rashid, Suraya Abdul Soleimani, Hassan Shafie, Suhaidi Noor, A.S.M. Mohammadi, Ahmad Institute of Advanced Technology Universiti Putra Malaysia Serdang Selangor43400UPM Malaysia Materials Processing and Technology Laboratory Nanomaterials and Nanotechnology Group Institute of Advanced Technology Universiti Putra Malaysia Serdang Selangor43400UPM Malaysia Department of Fundamental and Applied Science Universiti Teknologi PETRONAS Seri Iskandar3175 Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor43400 UPM Malaysia Faculty of Engineering Universiti Putra Malaysia Serdang Selangor43400UPM Malaysia Department of Electrical and Computer Engineering Buein Zahra Technical University Buein Zahra Qazvin Iran

A polypyrrole Chitosan Graphene Oxide (PPy-Chi/GO) composite layer was prepared using the electro-chemical method. The PPy-Chi/GO layer was used to measure the low concentration of napropamide. In this study, the PPy-Chi/GO composite layer was deposited on the gold layer side of a microscope's glass slide in different thicknesses. The morphology, thickness, roughness, and refractive index of the layer were obtained using field effect scanning electron microscopy, profilemeter, atomic force microscopy, and the surface plasmon resonance technique. The structure of the composite layer was investigated using X-Ray diffraction. The peak that were observed from X-ray diffraction was at 9.9°, corresponding to GO, and the broad peak between 25° and 27° was related to polypyrrole and chitosan. The PPy-Chi/GO layer was used to measure the concentration of napropamide dissolved in hexane in the range of 0.01 to 100 ppm using the surface plasmon resonance technique;the limitation of sensor was 0.1 ppm. © Published under licence by IOP Publishing Ltd.

关键词： Polypyrroles

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