检索结果-内蒙古大学图书馆

arXiv 2022年

作者： Buitrago-Casas, Juan Camilo Glesener, Lindsay Christe, Steven Krucker, Säm Vievering, Juliana Athiray, P.S. Musset, Sophie Davis, Lance Courtade, Sasha Dalton, Gregory Turin, Paul Turin, Zoe Ramsey, Brian Bongiorno, Stephen Ryan, Daniel Takahashi, Tadayuki Furukawa, Kento Watanabe, Shin Narukage, Noriyuki Ishikawa, Shin-Nosuke Mitsuishi, Ikuyuki Hagino, Kouichi Shourt, Van Duncan, Jessie Zhang, Yixian Bale, Stuart D. Space Sciences Laboratory University of California Berkeley BerkeleyCA United States Physics Department University of California BerkeleyCA United States University of Minnesota Physics & Astronomy MinneapolisMN United States NASA Goddard Space Flight Center GreenbeltMD United States University of Applied Sciences and Arts Northwestern Switzerland Windisch Switzerland Johns Hopkins University Applied Physics Laboratory LaurelMD United States NASA Marshall Space Flight Center HuntsvilleAL United States Netherlands Heliospace Corporation BerkeleyCA United States University of Colorado Boulder CO United States The University of Tokyo Japan Department of Physics The University of Tokyo Japan Institute of Space and Astronautical Science Kanagawa Japan National Astronomical Observatory of Japan Tokyo Japan Rikkyo University Graduate School of Artificial Intelligence and Science Tokyo Japan Nagoya University Graduate School of Science Aichi Japan Tokyo University of Science Shinjuku City Tokyo Japan

Context. Solar nanoflares are small impulsive events releasing magnetic energy in the corona. If nanoflares follow the same physics as their larger counterparts, they should emit hard X-rays (HXRs) but with a rather faint intensity. A copious and continuous presence of nanoflares would result in a sustained HXR emission. These nanoflares could deliver enormous amounts of energy into the solar corona, possibly accounting for its high temperatures. To date, there has not been any direct observation of such persistent HXRs from the quiescent Sun. However, Hannah et al. in 2010 constrained the quiet Sun HXR emission using almost 12 days of quiescent solar-off-pointing observations by RHESSI. These observations set 2σ upper limits at 3.4 × 10−2 photons s−1 cm−2 keV−1 and 9.5 × 10−4 photons s−1 cm−2 keV−1 for the 3-6 keV and 6-12 keV energy ranges, respectively. Aims. Observing faint HXR emission is challenging because it demands high sensitivity and dynamic range instruments. The Focusing Optics X-ray Solar Imager (FOXSI) sounding rocket experiment excels in these two attributes when compared with RHESSI. FOXSI completed its second and third successful flights (FOXSI-2 and -3) on December 11, 2014, and September 7, 2018, respectively. This paper aims to constrain the quiet Sun emission in the 5-10 keV energy range using FOXSI-2 and -3 observations. Methods. To fully characterize the sensitivity of FOXSI, we assessed ghost ray backgrounds generated by sources outside of the field of view via a ray-tracing algorithm. We use a bayesian approach to provide upper thresholds of quiet Sun HXR emission and probability distributions for the expected flux when a quiet-Sun HXR source is assumed to exist. Results. We found a FOXSI-2 upper limit of 4.5×10−2 photons s−1 cm−2 keV−1 with a 2σ confidence level in the 5-10 keV energy range. This limit is the first-ever quiet Sun upper threshold in HXR reported using ∼ 1-minute observations during a period of high solar activity. RHESSI wa

关键词： Solar energy

来源：评论

学校读者我要写书评

暂无评论

Three-flavor collective neutrino conversions with multi-azimuthal-angle instability in an electron-capture supernova model

引用

Physical Review D 2021年第6期103卷 063008-063008页

作者： Masamichi Zaizen Shunsaku Horiuchi Tomoya Takiwaki Kei Kotake Takashi Yoshida Hideyuki Umeda John F. Cherry Department of Astronomy Graduate School of Science University of Tokyo Tokyo 113-0033 Japan Center for Neutrino Physics Department of Physics Virginia Tech Blacksburg Virginia 24061 USA Division of Science National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo 181-8588 Japan Department of Applied Physics Fukuoka University Nanakuma 8-19-1 Johnan Fukuoka 814-0180 Japan Research Insitute of Stellar Explosive Phenomena Fukuoka University Nanakuma 8-19-1 Johnan Fukuoka 814-0180 Japan Department of Physics University of South Dakota Vermillion South Dakota 57069 USA

We investigate the multi-azimuthal angle (MAA) effect on collective neutrino oscillation by considering the three-dimensional neutrino momentum distribution in a realistic electron-capture supernova model with an 8.8 M⊙ progenitor. We find that the MAA effect induces collective flavor conversions at epochs when it is completely suppressed under the axial-symmetric approximation. This novel activity is switched on/off by the growth of the MAA instability and imprints additional time evolution in the expected neutrino event rate. We validate our results by extending the linear stability analysis into the three-flavor scheme including mixing angles, and confirm that the onset of collective neutrino oscillation matches the steep growth of flavor instability. We discuss how the MAA effect alters neutrino detection at Super-Kamiokande and DUNE.

关键词： Extrasolar neutrino astronomy Neutrino oscillations Novae & supernovae

来源：评论

学校读者我要写书评

暂无评论

Extended virtual detector theory including quantum interferences

arXiv

引用

arXiv 2020年

作者： Xu, Rui-Hua Wang, Xu Eberly, J.H. Institute of Applied Physics and Computational Mathematics Beijing100094 China Graduate School China Academy of Engineering Physics Beijing100193 China Department of Physics and Astronomy University of Rochester RochesterNY14627 United States

We extend our earlier "virtual detector" method [X. Wang, J. Tian, and J. H. Eberly, Phys. Rev. Lett. 110, 243001 (2013)], a hybrid quantum mechanical and classical trajectory method, to include phases in the classical trajectories. Effects of quantum interferences, lost in the earlier method, are restored. The obtained photoelectron momentum distributions agree well with the corresponding numerical solutions of the time-dependent Schrödinger equation. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum interference devices

来源：评论

学校读者我要写书评

暂无评论

Hint of a truncated primordial spectrum from the CMB large-scale anomalies

arXiv

引用

arXiv 2021年

作者： Melia, Fulvio Ma, Qingbo Wei, Jun-Jie Yu, Bo Department of Physics The Applied Math Program Department of Astronomy The University of Arizona TucsonAZ85721 United States Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing School of Physics and Electronic Science Guizhou Normal University Guiyang550001 China PMO Nanjing210023 China Guangxi Key Laboratory for Relativistic Astrophysics Guangxi University Nanning530004 China University of Chinese Academy of Sciences Beijing100049 China

Context. Several satellite missions have uncovered a series of potential anomalies in the fluctuation spectrum of the cosmic microwave background temperature, including: (1) an unexpectedly low level of correlation at large angles, manifested via the angular correlation function, C(θ);and (2) missing power in the low multipole moments of the angular power spectrum, C. Aims. Their origin is still debated, however, due to a persistent lack of clarity concerning the seeding of quantum fluctuations in the early Universe. A likely explanation for the first of these appears to be a cutoff, kmin = (3.14 ± 0.36) × 10−4 Mpc−1, in the primordial power spectrum, P(k). Our goal in this paper is twofold: (1) we examine whether the same kmin can also self-consistently explain the missing power at large angles, and (2) we confirm that the introduction of this cutoff in P(k) does not adversely affect the remarkable consistency between the prediction of Planck-ΛCDM and the Planck measurements at > 30. Methods. We use the publicly available code CAMB to calculate the angular power spectrum, based on a line-of-sight approach. The code is modified slightly to include the additional parameter (i.e., kmin) characterizing the primordial power spectrum. In addition to this cutoff, the code optimizes all of the usual standard-model parameters. Results. In fitting the angular power spectrum, we find an optimized cutoff, (Equation presented), when using the whole range of 's, and (Equation presented), when fitting only the range ≤ 30, where the Sachs-Wolfe effect is dominant. Conclusions. These are fully consistent with the value inferred from C(θ), suggesting that both of these large-angle anomalies may be due to the same truncation in P(k). © 2021, CC BY.

关键词： Cosmology

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to “Biochemical implications of the Bottom Boundary Layer Detachment at the Mid-Atlantic Bight shelf-break front” [Continent. Shelf Res. 286 (2025) 105408]

引用

Continental Shelf Research 2025年 288卷

作者： Serena Negroni Dennis J. McGillicuddy Glen G. Gawarkiewicz Paolo Oddo Nadia Pinardi Department of Physics and Astronomy (DIFA) University of Bologna Bologna 40126 Italy MIT/WHOI Joint Program in Oceanography/Applied Ocean Sciences and Engineering Woods Hole 02543 MA USA Woods Hole Oceanographic Institution Woods Hole 02543 MA USA

来源：评论

学校读者我要写书评

暂无评论

Topological Thermal Hall Effect of Magnons in Magnetic Skyrmion Lattice

arXiv

引用

arXiv 2021年

作者： Akazawa, Masatoshi Lee, Hyun-Yong Takeda, Hikaru Fujima, Yuri Tokunaga, Yusuke Arima, Taka-Hisa Han, Jung Hoon Yamashita, Minoru The Institute for Solid State Physics The University of Tokyo Kashiwa277-8581 Japan Department of Applied Physics Graduate School Korea University Sejong30019 Korea Republic of Division of Display and Semiconductor Physics Korea University Sejong30019 Korea Republic of Interdisciplinary Program in E·ICT-Culture-Sports Convergence Korea University Sejong30019 Korea Republic of Department of Advanced Materials Science University of Tokyo Kashiwa277-8561 Japan Department of Physics Sungkyunkwan University Suwon16419 Korea Republic of

Topological transports of fermions are governed by the Chern numbers of the energy bands lying below the Fermi energy. For bosons, e.g. phonons and magnons in a crystal, topological transport is dominated by the Chern number of the lowest energy band when the band gap is comparable to the thermal energy. Here, we demonstrate the presence of topological transport by bosonic magnons in a lattice of magnetic skyrmions – topological defects formed by a vortex-like texture of spins. We find a distinct thermal Hall signal in the magnetic skyrmion phase of an insulating polar magnet GaV4Se8, identified as the topological thermal Hall effect of magnons governed by the Chern number of the lowest energy band of the magnons in a triangular lattice of magnetic skyrmions. Our findings lay a foundation for studying topological phenomena of other bosonic excitations through thermal Hall probe. © 2021, CC BY.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Bridging particle deformability and collective response in soft solids

引用

Physical Review Materials 2021年第5期5卷 055605-055605页

作者： John D. Treado Dong Wang Arman Boromand Michael P. Murrell Mark D. Shattuck Corey S. O'Hern Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Biomedical Engineering Yale University New Haven Connecticut 06520 USA Department of Physics Yale University New Haven Connecticut 06520 USA Systems Biology Institute Yale University West Haven Connecticut 06516 USA Benjamin Levich Institute and Physics Department The City College of New York New York New York 10031 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

Soft, amorphous solids such as tissues, foams, and emulsions are composed of deformable particles. However, the effect of single-particle deformability on the collective behavior of soft solids is still poorly understood. We perform numerical simulations of two-dimensional jammed packings of explicitly deformable particles to study the mechanical response of model soft solids. We find that jammed packings of deformable particles with excess shape degrees of freedom possess low-frequency quartic vibrational modes that stabilize the packings even though they possess fewer interparticle contacts than the nominal isostatic value. Adding intraparticle constraints can rigidify the particles, but these particles undergo a buckling transition and gain an effective shape degree of freedom when their preferred perimeter is above a threshold value. We find that the mechanical response of jammed packings of deformable particles with shape degrees of freedom differs significantly from that of jammed packings of rigid-shape particles, which emphasizes the importance of particle deformability in modeling soft solids.

关键词： Collective behavior Jamming Emulsions Foams Tissues Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck. II. Cross-correlation measurements and cosmological constraints

引用

Physical Review D 2023年第2期107卷 023530-023530页

作者： C. Chang Y. Omori E. J. Baxter C. Doux A. Choi S. Pandey A. Alarcon O. Alves A. Amon F. Andrade-Oliveira K. Bechtol M. R. Becker G. M. Bernstein F. Bianchini J. Blazek L. E. Bleem H. Camacho A. Campos A. Carnero Rosell M. Carrasco Kind R. Cawthon R. Chen J. Cordero T. M. Crawford M. Crocce C. Davis J. DeRose S. Dodelson A. Drlica-Wagner K. Eckert T. F. Eifler F. Elsner J. Elvin-Poole S. Everett X. Fang A. Ferté P. Fosalba O. Friedrich M. Gatti G. Giannini D. Gruen R. A. Gruendl I. Harrison K. Herner H. Huang E. M. Huff D. Huterer M. Jarvis A. Kovacs E. Krause N. Kuropatkin P.-F. Leget P. Lemos A. R. Liddle N. MacCrann J. McCullough J. Muir J. Myles A. Navarro-Alsina Y. Park A. Porredon J. Prat M. Raveri R. P. Rollins A. Roodman R. Rosenfeld A. J. Ross E. S. Rykoff C. Sánchez J. Sanchez L. F. Secco I. Sevilla-Noarbe E. Sheldon T. Shin M. A. Troxel I. Tutusaus T. N. Varga N. Weaverdyck R. H. Wechsler W. L. K. Wu B. Yanny B. Yin Y. Zhang J. Zuntz T. M. C. Abbott M. Aguena S. Allam J. Annis D. Bacon B. A. Benson E. Bertin S. Bocquet D. Brooks D. L. Burke J. E. Carlstrom J. Carretero C. L. Chang R. Chown M. Costanzi L. N. da Costa A. T. Crites M. E. S. Pereira T. de Haan J. De Vicente S. Desai H. T. Diehl M. A. Dobbs P. Doel W. Everett I. Ferrero B. Flaugher D. Friedel J. Frieman J. García-Bellido E. Gaztanaga E. M. George T. Giannantonio N. W. Halverson S. R. Hinton G. P. Holder D. L. Hollowood W. L. Holzapfel K. Honscheid J. D. Hrubes D. J. James L. Knox K. Kuehn O. Lahav A. T. Lee M. Lima D. Luong-Van M. March J. J. McMahon P. Melchior F. Menanteau S. S. Meyer R. Miquel L. Mocanu J. J. Mohr R. Morgan T. Natoli S. Padin A. Palmese F. Paz-Chinchón A. Pieres A. A. Plazas Malagón C. Pryke C. L. Reichardt M. Rodríguez-Monroy A. K. Romer J. E. Ruhl E. Sanchez K. K. Schaffer M. Schubnell S. Serrano E. Shirokoff M. Smith Z. Staniszewski A. A. Stark E. Suchyta G. Tarle D. Thomas C. To J. D. Vieira J. Weller R. Williamson Department of Astronomy and Astrophysics University of Chicago Chicago Illinois 60637 USA Kavli Institute for Cosmological Physics University of Chicago Chicago Illinois 60637 USA Department of Physics Stanford University 382 Via Pueblo Mall Stanford California 94305 USA Kavli Institute for Particle Astrophysics & Cosmology P. O. Box 2450 Stanford University Stanford California 94305 USA Institute for Astronomy University of Hawai‘i 2680 Woodlawn Drive Honolulu Hawaii 96822 USA Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104 USA California Institute of Technology 1200 East California Blvd MC 249-17 Pasadena California 91125 USA Argonne National Laboratory 9700 South Cass Avenue Lemont Illinois 60439 USA Department of Physics University of Michigan Ann Arbor Michigan 48109 USA Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 Rio de Janeiro RJ - 20921-400 Brazil Physics Department 2320 Chamberlin Hall University of Wisconsin-Madison 1150 University Avenue Madison Wisconsin 53706-1390 School of Physics University of Melbourne Parkville Victoria 3010 Australia Department of Physics Northeastern University Boston Massachusetts 02115 USA Laboratory of Astrophysics École Polytechnique Fédérale de Lausanne (EPFL) Observatoire de Sauverny 1290 Versoix Switzerland Instituto de Física Teórica Universidade Estadual Paulista São Paulo Brazil Department of Physics Carnegie Mellon University Pittsburgh Pennsylvania 15312 USA Instituto de Astrofisica de Canarias E-38205 La Laguna Tenerife Spain Universidad de La Laguna Dpto. Astrofísica E-38206 La Laguna Tenerife Spain Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. Urbana Illinois 61801 USA Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street Urbana Illinois 61801 USA Physics Department William Jewell College Liberty Missouri 6

Cross-correlations of galaxy positions and galaxy shears with maps of gravitational lensing of the cosmic microwave background (CMB) are sensitive to the distribution of large-scale structure in the Universe. Such cross-correlations are also expected to be immune to some of the systematic effects that complicate correlation measurements internal to galaxy surveys. We present measurements and modeling of the cross-correlations between galaxy positions and galaxy lensing measured in the first three years of data from the Dark Energy Survey with CMB lensing maps derived from a combination of data from the 2500 deg2 SPT-SZ survey conducted with the South Pole Telescope and full-sky data from the Planck satellite. The CMB lensing maps used in this analysis have been constructed in a way that minimizes biases from the thermal Sunyaev Zel’dovich effect, making them well suited for cross-correlation studies. The total signal-to-noise of the cross-correlation measurements is 23.9 (25.7) when using a choice of angular scales optimized for a linear (nonlinear) galaxy bias model. We use the cross-correlation measurements to obtain constraints on cosmological parameters. For our fiducial galaxy sample, which consist of four bins of magnitude-selected galaxies, we find constraints of Ωm=0.272−0.052+0.032 and S8≡σ8Ωm/0.3=0.736−0.028+0.032 (Ωm=0.245−0.044+0.026 and S8=0.734−0.028+0.035) when assuming linear (nonlinear) galaxy bias in our modeling. Considering only the cross-correlation of galaxy shear with CMB lensing, we find Ωm=0.270−0.061+0.043 and S8=0.740−0.029+0.034. Our constraints on S8 are consistent with recent cosmic shear measurements, but lower than the values preferred by primary CMB measurements from Planck.

关键词： Cosmic microwave background Cosmological parameters Large scale structure of the Universe

来源：评论

学校读者我要写书评

暂无评论

ALMA View of the High-velocity-dispersion Compact Cloud CO 0.02-0.02 at the Galactic Center

arXiv

引用

arXiv 2023年

作者： Iwata, Yuhei Oka, Tomoharu Takekawa, Shunya Tsujimoto, Shiho Enokiya, Rei Division of Science National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Center for Astronomy Ibaraki University 2-1-1 Bunkyo Ibaraki Mito310-8512 Japan School of Fundamental Science and Technology Graduate School of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan Department of Physics Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan Department of Applied Physics Faculty of Engineering Kanagawa University 3-27-1 Rokkakubashi Kanagawa-ku Kanagawa Yokohama221-8686 Japan

We report the results of observations toward the center of the molecular cloud CO 0.02-0.02 made using the Atacama Large Millimeter/Submillimeter Array. The successfully obtained 100 resolution images of CO J=3-2, H13CN J=4-3, H13CO+ J=4-3, SiO J=8-7, CH3OH JKa,Kc = 71,7-61,6 A+ lines, and 900 µm continuum show several new features, which have not been identified in previous observations. The dense gas probe (H13CN, SiO, CH3OH) images are dominated by a pair of northeast-southwest elongated filaments, which may be the main body of CO 0.02-0.02. Two striped patterns perpendicular to each other (F1 and F2) and a high-velocity feature (HV), which appear in different velocity ranges, were prominent in the CO image. An emission hole that may represent an expanding feature was found in the F1 velocity range. F2 appeared to align along the western edge of a 20 pc×13 pc ellipse (the Large Shell) identified in the single-dish CO map. The HV contains eight compact clumps at the positive high-velocity end of the CO emissions. Based on these results, we propose a formation scenario for CO 0.02-0.02;internal explosions of supernovae, external perturbations by the Large Shell, and gravitational acceleration by a less luminous star cluster have formed CO 0.02-0.02 in its current state. © 2023, CC BY.

关键词： Silicon compounds

来源：评论

学校读者我要写书评

暂无评论

Advancing hybrid quantum-classical algorithms via mean-operators

arXiv

引用

arXiv 2021年

作者： Kim, Donggyu Noh, Pureum Lee, Hyun-Yong Moon, Eun-Gook Daejeon34141 Korea Republic of Department of Applied Physics Graduate School Korea University Sejong30019 Korea Republic of Division of Display and Semiconductor Physics Korea University Sejong30019 Korea Republic of Interdisciplinary Program in E· ICT-Culture-Sports Convergence Korea University Sejong30019 Korea Republic of

Entanglement in quantum many-body systems is the key concept for future technology and science, opening up a possibility to explore uncharted realms in an enormously large Hilbert space. The hybrid quantum-classical algorithms have been suggested to control quantum entanglement of many-body systems, and yet their applicability is intrinsically limited by the numbers of qubits and quantum operations. Here we propose a theory which overcomes the limitations by combining advantages of the hybrid algorithms and the standard mean-field-theory in condensed matter physics, named as mean-operator-theory. We demonstrate that the number of quantum operations to prepare an entangled target many-body state such as symmetry-protected-topological states is significantly reduced by introducing a mean-operator. We also show that a class of mean-operators is expressed as time-evolution operators and our theory is directly applicable to quantum simulations with 87Rb neutral atoms or trapped 40Ca+ ions. © 2021, CC BY.

关键词： Quantum entanglement

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：