检索结果-内蒙古大学图书馆

arXiv 2023年

作者： Abdulameer, N.J. Acharya, U. Adare, A. Aidala, C. Ajitanand, N.N. Akiba, Y. Akimoto, R. Alexander, J. Alfred, M. Andrieux, V. Aoki, K. Apadula, N. Asano, H. Atomssa, E.T. Awes, T.C. Azmoun, B. Babintsev, V. Bai, M. Bai, X. Bandara, N.S. Bannier, B. Barish, K.N. Bathe, S. Baublis, V. Baumann, C. Baumgart, S. Bazilevsky, A. Beaumier, M. Beckman, S. Belmont, R. Berdnikov, A. Berdnikov, Y. Bichon, L. Black, D. Blankenship, B. Blau, D.S. Bok, J.S. Borisov, V. Boyle, K. Brooks, M.L. Bryslawskyj, J. Buesching, H. Bumazhnov, V. Butsyk, S. Campbell, S. Roman, V. Canoa Cervantes, R. Chen, C.-H. Chen, D. Chiu, M. Chi, C.Y. Choi, I.J. Choi, J.B. Choi, S. Christiansen, P. Chujo, T. Cianciolo, V. Citron, Z. Cole, B.A. Connors, M. Corliss, R. Morales, Y. Corrales Cronin, N. Crossette, N. Csanád, M. Csörgo, T. D’Orazio, L. Danley, T.W. Datta, A. Daugherity, M.S. David, G. Dean, C.T. DeBlasio, K. Dehmelt, K. Denisov, A. Deshpande, A. Desmond, E.J. Ding, L. Dion, A. Diss, P.B. Dixit, D. Doomra, V. Do, J.H. Drapier, O. Drees, A. Drees, K.A. Durham, J.M. Durum, A. En’yo, H. Engelmore, T. Enokizono, A. Esha, R. Eyser, K.O. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Firak, D. Fitzgerald, D. Fleuret, F. Fokin, S.L. Frantz, J.E. Franz, A. Frawley, A.D. Fukao, Y. Fukuda, Y. Fusayasu, T. Gainey, K. Gallus, P. Gal, C. Garg, P. Garishvili, A. Garishvili, I. Ge, H. Giles, M. Giordano, F. Glenn, A. Gong, X. Gonin, M. Goto, Y. de Cassagnac, R. Granier Grau, N. Greene, S.V. Perdekamp, M. Grosse Gu, Y. Gunji, T. Guo, T. Guragain, H. Hachiya, T. Haggerty, J.S. Hahn, K.I. Hamagaki, H. Hamilton, H.F. Hanks, J. Han, S.Y. Harvey, M. Hasegawa, S. Haseler, T.O.S. Hashimoto, K. Hayano, R. Hemmick, T.K. Hester, T. He, X. Hill, J.C. Hill, K. Hodges, A. Hollis, R.S. Homma, K. Hong, B. Hoshino, T. Hotvedt, N. Huang, J. Ichihara, T. Ikeda, Y. Imai, K. Imazu, Y. Inaba, M. Iordanova, A. Abilene Christian University AbileneTX79699 United States Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Faculty of Mathematics and Physics Troja Prague180 00 Czech Republic Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New York New York 10027 Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Debrecen University Egyetem tér 1 DebrecenH-4010 Hungary ELTE Eötvös Loránd University Pázmány P. s. 1/A BudapestH-1117 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida A&M University TallahasseeFL32307 United States Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hanyang University Seoul133-792 Korea Republic of Hiroshima University Higashi-Hiroshima Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino142281 Russia University of Illinois at Urbana-Champaign UrbanaIL61801 United States Institute for Nuclear Research the Russian Academy of Sciences prospekt 60-letiya Oktyabrya 7a Moscow117312 Russ

The PHENIX experiment has performed a systematic study of identified charged-hadron (π±, K±, p, p¯) production at midrapidity in p+Al, 3He+Au, Cu+Au collisions at √sNN = 200 GeV and U+U collisions at √sNN = 193 GeV. Identified charged-hadron invariant transverse-momentum (pT) and transverse-mass (mT) spectra are presented and interpreted in terms of radially expanding thermalized systems. The particle ratios of K/π and p/π have been measured in different centrality ranges of large (Cu+Au, U+U) and small (p+Al, 3He+Au) collision systems. The values of K/π ratios measured in all considered collision systems were found to be consistent with those measured in p+p collisions. However the values of p/π ratios measured in large collision systems reach the values of ≈ 0.6, which is ≈ 2 times larger than in p+p collisions. These results can be qualitatively understood in terms of the baryon enhancement expected from hadronization by recombination. Identified charged-hadron nuclear-modification factors (RAB) are also presented. Enhancement of proton RAB values over meson RAB values was observed in central 3He+Au, Cu+Au, and U+U collisions. The proton RAB values measured in p+Al collision system were found to be consistent with RAB values of , π±, K±, and π0 mesons, which may indicate that the size of the system produced in p+Al collisions is too small for recombination to cause a noticeable increase in proton production. Copyright © 2023, The Authors. All rights reserved.

关键词： Hadrons

来源：评论

学校读者我要写书评

暂无评论

Void-defect induced magnetism and structure change of carbon material-II: Graphene molecules

arXiv

引用

arXiv 2021年

作者： Ota, Norio Li, Aigen Nemes, Laszlo Otsuka, Masaaki Graduate School of Pure and Applied Sciences University of Tsukuba 1-1-1 Tennodai Tsukuba-City Ibaraki305-8571 Japan Department of Physics and Astronomy University of Missouri ColumbiaMO65211 United States Research Center for Natural Sciences Ötvös Lóránd Research Network Budapest1519 Hungary Okayama Observatory Kyoto University Asakuchi Okayama719-0232 Japan

Void-defect is a possible origin of ferromagnetic feature on pure carbon materials. In our previous paper, void-defect on graphene-nanoribbon show highly polarized spin configuration. In this paper, we studied cases for graphene molecules by quantum theory, by astronomical observation and by laboratory experiment. Model molecules for the density functional theory are graphene molecules of C23and C53induced by a void-defect. They have carbon pentagon ring within a hexagon network. Single void has three radical carbons, holding six spins. Those spins make several spin-states, which affects to molecular structure and molecular vibration, finally to infrared spectrum. The stable spin state was triplet, not singlet. This suggests magnetic pure carbon molecule. It was a surprise that those molecules show close infrared spectrum with astronomically observed one, especially observed on carbon rich planetary nebulae. We could assign major band at 18.9 micrometer, and sub-bands at 6.6, 7.0, 7.6, 8.1, 8.5, 9.0 and 17.4 micrometer. Also, calculated spectrum roughly coincides with that of laboratory experiment by the laser-induced carbon plasma, which is an analogy of cosmic carbon creation in interstellar space. © 2021, CC BY.

关键词： Spin dynamics

来源：评论

学校读者我要写书评

暂无评论

Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

引用

Physical Review Letters 2022年第10期129卷 101102-101102页

作者： O. Adriani Y. Akaike K. Asano Y. Asaoka E. Berti G. Bigongiari W. R. Binns M. Bongi P. Brogi A. Bruno J. H. Buckley N. Cannady G. Castellini C. Checchia M. L. Cherry G. Collazuol K. Ebisawa A. W. Ficklin H. Fuke S. Gonzi T. G. Guzik T. Hams K. Hibino M. Ichimura K. Ioka W. Ishizaki M. H. Israel K. Kasahara J. Kataoka R. Kataoka Y. Katayose C. Kato N. Kawanaka Y. Kawakubo K. Kobayashi K. Kohri H. S. Krawczynski J. F. Krizmanic P. Maestro P. S. Marrocchesi A. M. Messineo J. W. Mitchell S. Miyake A. A. Moiseev M. Mori N. Mori H. M. Motz K. Munakata S. Nakahira J. Nishimura G. A. de Nolfo S. Okuno J. F. Ormes S. Ozawa L. Pacini P. Papini B. F. Rauch S. B. Ricciarini K. Sakai T. Sakamoto M. Sasaki Y. Shimizu A. Shiomi P. Spillantini F. Stolzi S. Sugita A. Sulaj M. Takita T. Tamura T. Terasawa S. Torii Y. Tsunesada Y. Uchihori E. Vannuccini J. P. Wefel K. Yamaoka S. Yanagita A. Yoshida K. Yoshida W. V. Zober Department of Physics University of Florence Via Sansone 1—50019 Sesto Fiorentino Italy INFN Sezione di Florence Via Sansone 1—50019 Sesto Fiorentino Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo 162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba 277-8582 Japan Department of Physical Sciences Earth and Environment University of Siena via Roma 56 53100 Siena Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3—56127 Pisa Italy Department of Physics and McDonnell Center for the Space Sciences Washington University One Brookings Drive St. Louis Missouri 63130-4899 USA Heliospheric Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle Baltimore Maryland 21250 USA Astroparticle Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Research and Exploration in Space Sciences and Technology NASA/GSFC Greenbelt Maryland 20771 USA Institute of Applied Physics (IFAC) National Research Council (CNR) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton Rouge Louisiana 70803 USA Department of Physics and Astronomy University of Padova Via Marzolo 8 35131 Padova Italy INFN Sezione di Padova Via Marzolo 8 35131 Padova Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Sagamihara Kanagawa 252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Yokohama Kanagawa 221-8686 Japan Faculty of Science and Technology Graduate School of Science and Technology Hirosaki University 3 Bunkyo Hirosaki Aomori 036-8561 Jap

A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported. The analysis is based on the data collected during ∼6.2 years of smooth operations aboard the International Space Station and covers a broader energy range with respect to the previous proton flux measurement by CALET, with an increase of the available statistics by a factor of ∼2.2. Above a few hundred GeV we confirm our previous observation of a progressive spectral hardening with a higher significance (more than 20 sigma). In the multi-TeV region we observe a second spectral feature with a softening around 10 TeV and a spectral index change from −2.6 to −2.9 consistently, within the errors, with the shape of the spectrum reported by DAMPE. We apply a simultaneous fit of the proton differential spectrum which well reproduces the gradual change of the spectral index encompassing the lower energy power-law regime and the two spectral features observed at higher energies.

关键词： Cosmic ray acceleration Cosmic ray composition & spectra Cosmic ray propagation Cosmic ray sources Cosmic rays & astroparticles

来源：评论

学校读者我要写书评

暂无评论

Large amplitude bidirectional anisotropy of cosmic-ray intensity observed with world-wide networks of ground-based neutron monitors and muon detectors in November, 2021

arXiv

引用

arXiv 2022年

作者： Munakata, Kazuoki Kozai, M. Kato, C. Hayashi, Y. Kataoka, R. Kadokura, A. Tokumaru, M. Mendonça, R.R.S. Echer, E. Dal Lago, A. Rockenbach, M. Schuch, N.J. Bageston, J.V. Braga, C.R. Al Jassar, H.K. Sharma, M.M. Duldig, M.L. Humble, J.E. Sabbah, I. Evenson, P. Mangeard, P.-S. Kuwabara, T. Ruffolo, D. Sáiz, A. Mitthumsiri, W. Nuntiyakul, W. Kóta, J. Department of Physics Shinshu University Nagano Matsumoto390-8621 Japan Polar Environment Data Science Center Joint Support-Center for Data Science Research Research Organization of Information and Systems Tachikawa Tokyo190-0014 Japan National Institute of Polar Research Tachikawa Tokyo190-8518 Japan Department of Polar Science School of Multidisciplinary Sciences The Graduate University for Advanced Studies SOKENDAI Tachikawa Tokyo190-8518 Japan Institute for Space-Earth Environmental Research Nagoya University Aichi Nagoya464-8601 Japan São José dos Campos12227-010 Brazil Southern Space Coordination National Institute for Space Research P.O. Box 5021 RS Santa Maria97110-970 Brazil George Mason University 4400 University Drive FairfaxVA22030 United States Physics Department Kuwait University P.O. Box 5969 Safat13060 Kuwait School of Natural Sciences University of Tasmania HobartTAS7001 Australia Department of Natural Sciences College of Health Sciences Public Authority of Applied Education and Training Kuwait City72853 Kuwait Bartol Research Institute Department of Physics and Astronomy University of Delaware 217 Sharp Laboratory NewarkDE19716 United States Department of Physics Faculty of Science Mahidol University Bangkok10400 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Lunar and Planetary Laboratory University of Arizona TucsonAZ85721 United States

We analyze the cosmic-ray variations during a significant Forbush decrease observed with worldwide networks of ground-based neutron monitors and muon detectors during November 3-5, 2021. Utilizing the difference between primary cosmic-ray rigidities monitored by neutron monitors and muon detectors, we deduce the rigidity spectra of the cosmic-ray density (or omnidirectional intensity) and the first- and second-order anisotropies separately, for each hour of data. A clear two-step decrease is seen in the cosmic-ray density with the first ∼ 2% decrease after the interplanetary shock arrival followed by the second ∼ 5% decrease inside the magnetic flux rope (MFR) at 15 GV. Most strikingly, a large bidirectional streaming along the magnetic field is observed in the MFR with a peak amplitude of ∼ 5% at 15 GV which is comparable to the total density decrease inside the MFR. The bidirectional streaming could be explained by adiabatic deceleration and/or focusing in the expanding MFR, which have stronger effects for pitch angles near 90◦, or by selective entry of GCRs along a leg of the MFR. The peak anisotropy and density depression in the flux rope both decrease with increasing rigidity. The spectra vary dynamically indicating that the temporal variations of density and anisotropy appear different in neutron monitor and muon detector data. © 2022, CC BY.

关键词： Cosmic rays

来源：评论

学校读者我要写书评

暂无评论

The eROSITA final equatorial-depth survey (eFEDS): X-ray observable-to-mass-and-redshift relations of galaxy clusters and groups with weak-lensing mass calibration from the hyper suprime-cam subaru strategic program survey

arXiv

引用

arXiv 2021年

作者： Chiu, I-Non Ghirardini, Vittorio Liu, Ang Grandis, Sebastian Bulbul, Esra Bahar, Y. Emre Comparat, Johan Bocquet, Sebastian Clerc, Nicolas Klein, Matthias Liu, Teng Li, Xiangchong Miyatake, Hironao Mohr, Joseph More, Surhud Oguri, Masamune Okabe, Nobuhiro Pacaud, Florian Ramos-Ceja, Miriam E. Reiprich, Thomas H. Schrabback, Tim Umetsu, Keiichi Tsung-Dao Lee Institute Key Laboratory for Particle Physics Astrophysics and Cosmology Ministry of Education Shanghai Jiao Tong University Shanghai200240 China Department of Astronomy School of Physics and Astronomy Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University Shanghai200240 China 11F of AS/NTU Astronomy-Mathematics Building Taipei10617 Taiwan Max Planck Institute for Extraterrestrial Physics Giessenbachstrasse 1 Garching85748 Germany Faculty of Physics Ludwig-Maximilians-Universität Scheinerstr. 1 Munich81679 Germany IRAP Universite de Toulouse CNRS UPS CNES Toulouse France Department of Physics University of Tokyo 7-3-1 Hongo Bunkyoku Tokyo113-0033 Japan The University of Tokyo 5-1-5 Kashiwanoha Kashiwashi Chiba277-8583 Japan Nagoya University Nagoya464-8602 Japan Institute for Advanced Research Nagoya University Nagoya464-8601 Japan Division of Physics and Astrophysical Science Graduate School of Science Nagoya University Nagoya464-8602 Japan The Inter University Centre for Astronomy and Astrophysics Ganeshkhind Pune411007 India Research Center for the Early Universe University of Tokyo Tokyo113-0033 Japan Core Research for Energetic Universe Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8526 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama HigashiHiroshima Hiroshima739-8526 Japan Hiroshima Astrophysical Science Center Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8526 Japan Universität Bonn Aufdem Hügel 71 Bonn53121 Germany

We present the first weak-lensing mass calibration and X-ray scaling relations of galaxy clusters and groups selected in the eROSITA Final Equatorial Depth Survey (eFEDS) observed by Spectrum Roentgen Gamma/eROSITA over a contiguous footprint with an area of ≈ 140 deg2, using the three-year (S19A) weak-lensing data from the Hyper Suprime-Cam (HSC) Subaru Strategic program survey. In this work, we study a sample of 434 optically confirmed galaxy clusters (and groups) at redshift 0.01 z 1.3 with a median of 0.35, of which 313 systems are uniformly covered by the HSC survey to enable the extraction of the weak-lensing shear observable. In a Bayesian population modeling, we perform a blind analysis for the weak-lensing mass calibration by simultaneously modeling the observed count rate η and the shear profile g+of individual clusters through the count-rate-to-mass-and-redshift (η-M500-z) relation and the weak-lensing-mass-to-mass-and-redshift (MWL- M500-z) relation, respectively, while accounting for the bias in these observables using simulation-based calibrations. As a result, the count-rateinferred and lensing-calibrated cluster mass is obtained from the joint modeling of the scaling relations, as the ensemble mass spanning a range of 1013h-1Mo M500 1015h-1Mo with a median of ≈ 1014h-1Mofor the eFEDS sample. With the mass calibration, we further model the X-ray observable-to-mass-and-redshift relations, including the rest-frame soft-band and bolometric luminosity (LXand Lb), the emission-weighted temperature TX, the mass of intra-cluster medium Mg, and the mass proxy YX, which is the product of TXand Mg. Except for LXwith a steeper dependence on the cluster mass at a statistically significant level, we find that the other X-ray scaling relations all show a mass trend that is statistically consistent with the self-similar prediction at a level of 1.7σ. Meanwhile, all these scaling relations show no significant deviation from the self-similarity in their redshift scali

关键词： Surveys

来源：评论

学校读者我要写书评

暂无评论

Cerium features in kilonova near-infrared spectra: implication from a chemically peculiar star

arXiv

引用

arXiv 2023年

作者： Tanaka, Masaomi Domoto, Nanae Aoki, Wako Ishigaki, Miho N. Wanajo, Shinya Hotokezaka, Kenta Kawaguchi, Kyohei Kato, Daiji Lee, Jae-Joon Lee, Ho-Gyu Hirano, Teruyuki Kotani, Takayuki Kuzuhara, Masayuki Nishikawa, Jun Omiya, Masashi Tamura, Motohide Ueda, Akitoshi Astronomical Institute Tohoku University Aoba Sendai980-8578 Japan Division for the Establishment of Frontier Sciences Organization for Advanced Studies Tohoku University Sendai980-8577 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Am Mühlenberg 1 Potsdam-GolmD-14476 Germany Research Center for the Early Universe Graduate School of Science University of Tokyo Bunkyo Tokyo113-0033 Japan UTIAS The University of Tokyo Chiba Kashiwa277-8583 Japan Institute for Cosmic Ray Research The University of Tokyo Chiba Kashiwa277-8582 Japan Center for Gravitational Physics Yukawa Institute for Theoretical Physics Kyoto University Kyoto606-8502 Japan National Institute for Fusion Science 322-6 Oroshi-cho Toki509-5292 Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu University Fukuoka Kasuga816-8580 Japan Korea Astronomy and Space Science Institute 776 Daedeok-daero Yuseong-gu Daejeon34055 Korea Republic of Space Policy Research Center Science and Technology Policy Institute 370 Sicheong-daero Sejong30147 Korea Republic of Astrobiology Center 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan

Observations of the kilonova from a neutron star merger event GW170817 opened a way to directly study r-process nucleosynthesis by neutron star mergers. It is, however, challenging to identify the individual elements in the kilonova spectra due to lack of complete atomic data, in particular, at near-infrared wavelengths. In this paper, we demonstrate that spectra of chemically peculiar stars with enhanced heavy element abundances can provide us with an excellent astrophysical laboratory for kilonova spectra. We show that the photosphere of a late B-type chemically peculiar star HR 465 has similar lanthanide abundances and ionization degrees with those in the line forming region in a kilonova at ∼ 2.5 days after the merger. The near-infrared spectrum of HR 465 taken with Subaru/IRD indicates that Ce III lines give the strongest absorption features around 16,000 Å and there are no other comparably strong transitions around these lines. The Ce III lines nicely match with the broad absorption features at 14,500 Å observed in GW170817 with a blueshift of v = 0.1c, which supports recent identification of this feature as Ce III by Domoto et al. (2022). © 2023, CC BY.

关键词： Absorption spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Entanglement properties of disordered quantum spin chains with long-range antiferromagnetic interactions

引用

Physical Review B 2020年第21期102卷 214201-214201页

作者： Y. Mohdeb J. Vahedi N. Moure A. Roshani Hyun-Yong Lee R. N. Bhatt Stefan Kettemann Stephan Haas Department of Physics and Earth Sciences Jacobs University Bremen Bremen 28759 Germany Technische Universität Braunschweig Institut für Mathematische Physik Mendelssohnstr. 3 38106 Braunschweig Germany Department of Physics Sari Branch Islamic Azad University Sari 48164-194 Iran Department of Physics and Astronomy University of Southern California Los Angeles California 90089-0484 USA Department of Applied Physics Graduate School Korea University Sejong 30019 Korea Division of Display and Semiconductor Physics Korea University Sejong 30019 Korea Interdisciplinary Program in EċICT-Culture-Sports Convergence Korea University Sejong 30019 Korea Department of Electrical Engineering Princeton University Princeton New Jersey 08544 USA School of Natural Sciences Institute for Advanced Study Princeton New Jersey 08540 USA Division of Advanced Materials Science Pohang University of Science and Technology (POSTECH) Pohang 790-784 Korea

Entanglement measures are useful tools in characterizing otherwise unknown quantum phases and indicating transitions between them. Here we examine the concurrence and entanglement entropy in quantum spin chains with random long-range couplings, spatially decaying with a power-law exponent α. Using the strong disorder renormalization group (SDRG) technique, we find by analytical solution of the master equation a strong disorder fixed point, characterized by a fixed point distribution of the couplings with a finite dynamical exponent, which describes the system consistently in the regime α>12. A numerical implementation of the SDRG method yields a power-law spatial decay of the average concurrence, which is also confirmed by exact numerical diagonalization. However, we find that the lowest-order SDRG approach is not sufficient to obtain the typical value of the concurrence. We therefore implement a correction scheme which allows us to obtain the leading-order corrections to the random singlet state. This approach yields a power-law spatial decay of the typical value of the concurrence, which we derive both by a numerical implementation of the corrections and by analytics. Next, using numerical SDRG, the entanglement entropy (EE) is found to be logarithmically enhanced for all α, corresponding to a critical behavior with an effective central charge c=ln(2), independent of α. This is confirmed by an analytical derivation. Using numerical exact diagonalization (ED), we confirm the logarithmic enhancement of the EE and a weak dependence on α. For a wide range of partition size l, the EE fits a critical behavior with a central charge close to c=1, which is the same as for the clean Haldane-Shastry model with a power-law-decaying interaction with α=2. Only for small l≪L, in a range which increases with the number of spins N, we find deviations which are rather consistent with the strong disorder fixed point central charge c=ln(2). Furthermore, we find using ED that the conc

关键词： Magnetism Quantum entanglement Disordered systems Doped semiconductors Density matrix methods Exact diagonalization Renormalization group Tensor network methods

来源：评论

学校读者我要写书评

暂无评论

Anharmonicity and Universal Response of Linear Carbon Chain Mechanical Properties under Hydrostatic Pressure

引用

Physical Review Letters 2020年第10期125卷 105501-105501页

作者： Keshav Sharma Nathalia L. Costa Yoong Ahm Kim Hiroyuki Muramatsu Newton M. Barbosa Neto Luiz G. P. Martins Jing Kong Alexandre Rocha Paschoal Paulo T. Araujo Department of Physics and Astronomy University of Alabama Tuscaloosa Alabama 35487 USA Department of Physics Federal University of Ceara 60455-760 Fortaleza Ceara Brazil Department of Polymer Engineering School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute Chonnam National University 77 Yongbong-ro Buk-gu Gwangju 61186 Republic of Korea Research Institute for Supra-Materials Shinshu University 4-17-1 Wakasato Nagano Japan Institute of Natural Sciences Graduate Program in Physics Federal University of Para 66075-110 Belem PA Brazil Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

Isolated linear carbon chains (LCCs) encapsulated by multiwalled carbon nanotubes are studied under hydrostatic pressure (P) via resonance Raman scattering. The LCCs’ spectroscopic signature C band around 1850 cm−1 softens linearly with increasing P. A simple anharmonic force-constant model not only describes such softening but also shows that the LCCs’ Young’s modulus (E), Grüneisen parameter (γ), and strain (ϵ) follow universal P−1 and P2 laws, respectively. In particular, γ also presents a unified behavior for all LCCs. To the best of our knowledge, these are the first results reported on such isolated systems and the first work to explore universal P-dependent responses for LCCs’ E, ϵ, and γ.

关键词： Anharmonic lattice dynamics Compressive strength Elasticity Mechanical & acoustical properties Pressure effects Stress 1-dimensional systems Lattice models in condensed matter Pressure techniques Raman spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Metastable dynamics of neural circuits and networks

arXiv

引用

arXiv 2021年

作者： Brinkman, Braden A.W. Yan, Han Maffei, Arianna Park, Il Memming Fontanini, Alfredo Wang, Jin La Camera, Giancarlo Department of Neurobiology and Behavior & Program in Neuroscience Stony Brook University Stony BrookNY11794 United States Center for Neural Circuit Dynamics Stony Brook University Stony BrookNY11794 United States State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Jilin Changchun130022 China Department of Physics and Astronomy Stony Brook University Stony BrookNY11794 United States

Cortical neurons emit seemingly erratic trains of action potentials, or 'spikes', and neural network dynamics emerge from the coordinated spiking activity within neural circuits. These rich dynamics manifest themselves in a variety of patterns which emerge spontaneously or in response to incoming activity produced by sensory inputs. In this review, we focus on neural dynamics that is best understood as a sequence of repeated activations of a number of discrete hidden states. These transiently occupied states are termed 'metastable' and have been linked to important sensory and cognitive functions. In the rodent gustatory cortex, for instance, metastable dynamics have been associated with stimulus coding, with states of expectation, and with decision making. In frontal, parietal and motor areas of macaques, metastable activity has been related to behavioral performance, choice behavior, task difficulty, and attention. In this article, we review the experimental evidence for neural metastable dynamics together with theoretical approaches to the study of metastable activity in neural circuits. These approaches include: (i) a theoretical framework based on nonequilibrium statistical physics for network dynamics;(ii) statistical approaches to extract information about metastable states from a variety of neural signals, and (iii) recent neural network approaches, informed by experimental results, to model the emergence of metastable dynamics. By discussing these topics, we aim to provide a cohesive view of how transitions between different states of activity may provide the neural underpinnings for essential functions such as perception, memory, expectation or decision making, and more generally, how the study of metastable neural activity may advance our understanding of neural circuit function in health and disease. © 2021, CC BY.

关键词： Dynamics

来源：评论

学校读者我要写书评

暂无评论

BASS XXXV. The MBH − σ★ Relation of 105-Month Swift-BAT Type 1 AGNs

arXiv

引用

arXiv 2023年

作者： Caglar, Turgay Koss, Michael J. Burtscher, Leonard Trakhtenbrot, Benny Erdim, M. Kiyami Mejía-Restrepo, Julian E. Ricci, Federica Powell, Meredith C. Ricci, Claudio Mushotzky, Richard Bauer, Franz E. Ananna, Tonima T. Bär, Rudolf E. Brandl, Bernhard Brinchmann, Jarle Harrison, Fiona Ichikawa, Kohei Kakkad, Darshan Oh, Kyuseok Riffel, Rogério Sartori, Lia F. Smith, Krista L. Stern, Daniel Urry, C. Megan Leiden Observatory PO Box 9513 Leiden2300 RA Netherlands Eureka Scientific 2452 Delmer Street Suite 100 OaklandCA94602-3017 United States Space Science Institute 4750 Walnut Street Suite 205 BoulderCO80301 United States School of Physics and Astronomy Tel Aviv University Tel Aviv69978 Israel Yildiz Technical University Graduate School of Natural and Applied Sciences Istanbul34220 Turkey European Southern Observatory Casilla 19001 Santiago19 Chile Dipartimento di Matematica e Fisica Università degli Studi Roma Tre via della ‘Vasca Navale 84 Roma00146 Italy INAF - Osservatorio Astronomico di Roma via Frascati 33 Monte Porzio Catone00044 Italy Kavli Institute for Particle Astrophysics and Cosmology Stanford University 452 Lomita Mall StanfordCA94305 United States Núcleo de Astronomía de la Facultad de Ingeniería Universidad Diego Portales Av. Ejército Libertador 441 Santiago Chile Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China George Mason University Department of Physics & Astronomy MS 3F3 4400 University Drive FairfaxVA22030 United States Department of Astronomy Joint Space-Science Institute University of Maryland College ParkMD20742 United States Instituto de Astrofísica Centro de Astroingeniería Facultad de Física Pontificia Universidad Católica de Chile Casilla 306 Santiago22 Chile Nuncio Monseñor Sótero Sanz 100 Providencia Santiago Chile Space Science Institute 4750 Walnut Street Suite 205 BoulderCO80301 United States Department of Physics and Astronomy Dartmouth College 6127 Wilder Laboratory HanoverNH03755 United States Institute for Particle Physics and Astrophysics ETH Zürich Wolfgang-Pauli-Strasse 27 ZürichCH-8093 Switzerland Centro de Astrofísica Universidade do Porto Rua das Estrelas Porto4150-762 Portugal Instituto de Astrofísica e Ciências do Espaço Universidade do Porto CAUP Rua das Estrelas Porto4150-762 Portugal Cahill Center for Astronomy and Astrophysics Ca

We present two independent measurements of stellar velocity dispersions (σ★ ) from the Ca ii H+K λ3969, 3934 & Mg i bλ5183, 5172, 5167 region (3880–5550 Å) and the Calcium Triplet region (CaT, 8350–8750 Å) for 173 hard X-ray-selected Type 1 AGNs (z ≤ 0.08) from the 105-month Swift-BAT catalog. We construct one of the largest samples of local Type 1 AGNs that have both single-epoch (SE)’virial’ black hole mass (MBH) estimates and σ★ measurements obtained from high spectral resolution data, allowing us to test the usage of such methods for SMBH studies. We find that the two independent σ★ measurements are highly consistent with each other, with an average offset of only 0.002 ± 0.001 dex. Comparing MBH estimates based on broad emission lines and stellar velocity dispersion measurements, we find that the former is systematically lower by ≈0.12 dex. Consequently, Eddington ratios estimated through broad-line MBH determinations are similarly biased (but in the opposite way). We argue that the discrepancy is driven by extinction in the broad-line region (BLR). We also find an anti-correlation between the offset from the MBH − σ★ relation and the Eddington ratio. Our sample of Type 1 AGNs shows a shallower MBH −σ★ relation (with a power law exponent of ≈3.5) compared with that of inactive galaxies (with a power-law exponent of ≈4.5), confirming earlier results obtained from smaller samples. Copyright © 2023, The Authors. All rights reserved.

关键词： Active Galactic Nuclei

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：