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arXiv 2018年

作者： Chang, C.C. Nicholson, A.N. Rinaldi, E. Berkowitz, E. Garron, N. Brantley, D.A. Monge-Camacho, H. Monahan, C. Bouchard, C. Clark, M.A. Joó, B. Kurth, T. Orginos, K. Vranas, P. Walker-Loud, A. Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States RIKEN 2-1 Hirosawa Wako Saitama351-0198 Japan Department of Physics University of California BerkeleyCA94720 United States Department of Physics and Astronomy University of North Carolina Chapel HillNC27516-3255 United States RIKEN-BNL Research Center Brookhaven National Laboratory UptonNY11973 United States Physics Division Lawrence Livermore National Laboratory LivermoreCA94550 United States Institut für Kernphysik Institute for Advanced Simulation Forschungszentrum Jülich Jülich54245 Germany Theoretical Physics Division Department of Mathematical Sciences University of Liverpool LiverpoolL69 3BX United Kingdom Department of Physics College of William & Mary WilliamsburgVA 23187 United States Department of Physics and Astronomy Rutgers State University of New Jersey PiscatawayNJ08854 United States Institute for Nuclear Theory University of Washington SeattleWA98195 United States School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom NVIDIA Corporation 2701 San Tomas Expressway Santa ClaraCA95050 United States Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States

The axial coupling of the nucleon, gA, is the strength of its coupling to the weak axial current of the Standard Model of particle physics, in much the same way as the electric charge is the strength of the coupling to the electromagnetic current. This axial coupling dictates the rate at which neutrons decay to protons, the strength of the attractive long-range force between nucleons and other features of nuclear physics. Precision tests of the Standard Model in nuclear environments require a quantitative understanding of nuclear physics rooted in Quantum Chromodynamics, a pillar of the Standard Model. The prominence of gA makes it a benchmark quantity to determine theoretically – a difficult task because quantum chromodynamics is non-perturbative, precluding known analytical methods. Lattice Quantum Chromodynamics provides a rigorous, non-perturbative definition of quantum chromodynamics that can be implemented numerically. It has been estimated that a precision of two percent would be possible by 2020 if two challenges are overcome1,2: contamination of gA from excited states must be controlled in the calculations and statistical precision must be improved markedly2–10. Here we report a calculation of gAQCD = 1.271 ± 0.013, using an unconventional method inspired by the Feynman–Hellmann theorem11 that overcomes these challenges. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum theory

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Symmetries and interactions from lattice QCD

arXiv

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arXiv 2018年

作者： Nicholson, A. Berkowitz, E. Monge-Camacho, H. Brantley, D. Garron, N. Chang, C.C. Rinaldi, E. Monahan, C. Bouchard, C. Clark, M.A. Joo, B. Kurth, T. Tiburzi, B.C. Vranas, P. Walker-Loud, A. Department of Physics and Astronomy University of North Carolina Chapel HillNC27516-3255 United States Department of Physics University of California Berkeley94720 United States Institut fur Kernphysik and Institute for Advanced Simulation Forschungszentrum Julich Julich54245 Germany Department of Physics College of William and Mary WilliamsburgVA23187 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics College of William and Mary WilliamsburgVA23187 United States Physics Division Lawrence Livermore National Laboratory LivermoreCA94550 United States Theoretical Physics Division Department of Mathematical Sciences University of Liverpool LiverpoolL693BX United Kingdom RIKEN 2-1 Hirosawa Wako Saitama351-0198 RIKEN BNL Research Center Brookhaven National Laboratory UptonNY11973 United States Institute for Nuclear Theory University of Washington SeattleWA98195 United States University of Glasgow GlasgowG128QQ United Kingdom NVIDIA Corporation 2701 San Tomas Expressway Santa ClaraCA95050 United States Scientic Computing Group Thomas Jeerson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics City College of New York New YorkNY10031 United States Graduate School and University Center the City University of New York New York NY 10016 USA

Precision experimental tests of the Standard Model of particle physics (SM) are one of our best hopes for discovering what new physics lies beyond the SM (BSM). Key in the search for new physics is the connection between theory and experiment. Forging this connection for searches involving low-energy hadronic or nuclear environments requires the use of a non-perturbative theoretical tool, lattice QCD. We present two recent lattice QCD calculations by the CalLat collaboration relevant for new physics searches: The nucleon axial coupling, gA, whose precise value as predicted by the SM could help point to new physics contributions to the so-called \neutron lifetime puzzle", and hadronic matrix elements of short-ranged operators relevant for neutrinoless double beta decay searches. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum theory

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Quantum electrodynamical theory of high-efficiency excitation energy transfer in laser-driven nanostructure systems

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Physical Review B 2016年第8期94卷 085133-085133页

作者： Dilusha Weeraddana Malin Premaratne Sarath D. Gunapala David L. Andrews Advanced Computing and Simulation Laboratory Department of Electrical and Computer Systems Engineering Monash University Clayton 3800 VIC Australia Jet Propulsion Laboratory California Institute of Technology Pasadena 91109 CA United States School of Chemistry University of East Anglia Norwich Research Park Norwich NR4 7TJ United Kingdom

A fundamental theory is developed for describing laser-driven resonance energy transfer (RET) in dimensionally constrained nanostructures within the framework of quantum electrodynamics. The process of RET communicates electronic excitation between suitably disposed emitter and detector particles in close proximity, activated by the initial excitation of the emitter. Here, we demonstrate that the transfer rate can be significantly increased by propagation of an auxiliary laser beam through a pair of nanostructure particles. This is due to the higher order perturbative contribution to the Förster-type RET, in which laser field is applied to stimulate the energy transfer process. We construct a detailed picture of how excitation energy transfer is affected by an off-resonant radiation field, which includes the derivation of second and fourth order quantum amplitudes. The analysis delivers detailed results for the dependence of the transfer rates on orientational, distance, and laser intensity factor, providing a comprehensive fundamental understanding of laser-driven RET in nanostructures. The results of the derivations demonstrate that the geometry of the system exercises considerable control over the laser-assisted RET mechanism. Thus, under favorable conformational conditions and relative spacing of donor-acceptor nanostructures, the effect of the auxiliary laser beam is shown to produce up to 70% enhancement in the energy migration rate. This degree of control allows optical switching applications to be identified.

关键词： Electromagnetism Excitons Lasers Light-matter interaction Nanostructures

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Noise subtraction from KAGRA O3GK data using Independent Component Analysis

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Classical and Quantum Gravity 2023年第8期40卷 085015-085015页

作者： H Abe T Akutsu M Ando A Araya N Aritomi H Asada Y Aso S Bae Y Bae R Bajpai K Cannon Z Cao E Capocasa M Chan C Chen D Chen K Chen Y Chen C-Y Chiang Y-K Chu S Eguchi M Eisenmann Y Enomoto R Flaminio H K Fong Y Fujii Y Fujikawa Y Fujimoto I Fukunaga D Gao G-G Ge S Ha I P W Hadiputrawan S Haino W-B Han K Hasegawa K Hattori H Hayakawa K Hayama Y Himemoto N Hirata C Hirose T-C Ho B-H Hsieh H-F Hsieh C Hsiung H-Y Huang P Huang Y-C Huang Y-J Huang D C Y Hui S Ide K Inayoshi Y Inoue K Ito Y Itoh C Jeon H-B Jin K Jung P Jung K Kaihotsu T Kajita M Kakizaki M Kamiizumi N Kanda T Kato K Kawaguchi C Kim J Kim J C Kim Y-M Kim N Kimura T Kiyota Y Kobayashi K Kohri K Kokeyama A K H Kong N Koyama C Kozakai J Kume Y Kuromiya S Kuroyanagi K Kwak E Lee H W Lee R Lee M Leonardi K L Li P Li L C -C Lin C-Y Lin E T Lin F-K Lin F-L Lin H L Lin G C Liu L-W Luo M Ma’arif E Majorana Y Michimura N Mio O Miyakawa K Miyo S Miyoki Y Mori S Morisaki N Morisue Y Moriwaki K Nagano K Nakamura H Nakano M Nakano Y Nakayama T Narikawa L Naticchioni L Nguyen Quynh W-T Ni T Nishimoto A Nishizawa S Nozaki Y Obayashi W Ogaki J J Oh K Oh M Ohashi T Ohashi M Ohkawa H Ohta Y Okutani K Oohara S Oshino S Otabe K-C Pan A Parisi J Park F E Pe na Arellano S Saha Y Saito K Sakai T Sawada Y Sekiguchi L Shao Y Shikano H Shimizu K Shimode H Shinkai T Shishido A Shoda K Somiya I Song R Sugimoto J Suresh T Suzuki H Tagoshi H Takahashi R Takahashi S Takano H Takeda M Takeda K Tanaka T Tanaka S Tanioka A Taruya T Tomaru T Tomura L Trozzo T Tsang J-S Tsao S Tsuchida T Tsutsui D Tuyenbayev N Uchikata T Uchiyama A Ueda T Uehara K Ueno G Ueshima T Ushiba M H P M van Putten J Wang T Washimi C Wu H Wu T Yamada K Yamamoto T Yamamoto K Yamashita R Yamazaki Y Yang S Yeh J Yokoyama T Yokozawa T Yoshioka H Yuzurihara S Zeidler M Zhan H Zhang Y Zhao Z-H Zhu The KAGRA Collaboration Graduate School of Science Tokyo Institute of Technology Meguro-ku Tokyo 152-8551 Japan Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Department of Physics The University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan Research Center for the Early Universe (RESCEU) The University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan Earthquake Research Institute The University of Tokyo Bunkyo-ku Tokyo 113-0032 Japan Department of Mathematics and Physics Gravitational Wave Science Project Hirosaki University Hirosaki City Aomori 036-8561 Japan Kamioka Branch National Astronomical Observatory of Japan (NAOJ) Kamioka-cho Hida City Gifu 506-1205 Japan The Graduate University for Advanced Studies (SOKENDAI) Mitaka City Tokyo 181-8588 Japan Korea Institute of Science and Technology Information (KISTI) Yuseong-gu Daejeon 34141 Republic of Korea National Institute for Mathematical Sciences Yuseong-gu Daejeon 34047 Republic of Korea School of High Energy Accelerator Science The Graduate University for Advanced Studies (SOKENDAI) Tsukuba City Ibaraki 305-0801 Japan Department of Astronomy Beijing Normal University Beijing 100875 People’s Republic of China Department of Applied Physics Fukuoka University Jonan Fukuoka City Fukuoka 814-0180 Japan Department of Physics Tamkang University Danshui Dist. New Taipei City 25137 Taiwan Department of Physics and Institute of Astronomy National Tsing Hua University Hsinchu 30013 Taiwan Department of Physics Center for High Energy and High Field Physics National Central University Zhongli District Taoyuan City 32001 Taiwan Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan Institute of Physics Academia Sinica Nankang Taipei 11529 Taiwan Univ. Grenoble Alpes Laboratoire d’Annecy de Physique des Particules (LAPP) Université Savoie M

During April 7–21 2020, KAGRA conducted its first scientific observation in conjunction with the GEO600 detector. The dominant noise sources during this run were found to be suspension control noise in the low-frequency range and acoustic noise in the mid-frequency range. In this study, we show that their contributions in the observational data can be reduced by a signal processing method called independent component analysis (ICA). The model of ICA is extended from that studied in the initial KAGRA data analysis to account for frequency dependence, while the linearity and stationarity of the coupling between the interferometer and the noise sources are still assumed. We identify optimal witness sensors in the application of ICA, leading to successful mitigation of these two dominant contributions. We also analyze the stability of the transfer functions for the entire two weeks of data to investigate the applicability of the proposed subtraction method in gravitational wave searches.

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Quantum electrodynamics of resonance energy transfer in nanowire systems

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Physical Review B 2016年第7期93卷 075151-075151页

作者： Dilusha Weeraddana Malin Premaratne David L. Andrews Advanced Computing and Simulation Laboratory (A-L) Department of Electrical and Computer Systems Engineering Monash University Clayton 3800 VIC Australia School of Chemistry University of East Anglia Norwich Research Park Norwich NR4 7TJ United Kingdom

Nonradiative resonance energy transfer (RET) provides the ability to transfer excitation energy between contiguous nanowires (NWs) with high efficiency under certain conditions. Nevertheless, the well-established Förster formalism commonly used to represent RET was developed for energy transfer primarily between molecular blocks (i.e., from one molecule, or part of a molecule, to another). Although deviations from Förster theory for functional blocks such as NWs have been studied previously, the role of the relative distance, the orientation of transition dipole moment pairs, and the passively interacting matter on electronic energy transfer are to a large extent unknown. Thus, a comprehensive theory that models RET in NWs is required. In this context, analytical insights to give a deeper and more intuitive understanding of the distance and orientation dependence of RET in NWs is presented within the framework of quantum electrodynamics. Additionally, the influence of an included intermediary on the rate of excitation energy transfer is illustrated, embracing indirect energy transfer rate and quantum interference. The results deliver equations that afford new intuitions into the behavior of virtual photons. In particular, results indicate that RET efficiency in a NW system can be explicitly expedited or inhibited by a neighboring mediator, depending on the relative spacing and orientation of NWs.

关键词： Quantum electrodynamics Nanowires

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Few-nucleon and many-nucleon systems with semilocal coordinate-space regularized chiral nucleon-nucleon forces

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Physical Review C 2018年第1期98卷 014002-014002页

作者： S. Binder A. Calci E. Epelbaum R. J. Furnstahl J. Golak K. Hebeler T. Hüther H. Kamada H. Krebs P. Maris Ulf-G. Meißner A. Nogga R. Roth R. Skibiński K. Topolnicki J. P. Vary K. Vobig H. Witała Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA TRIUMF 4004 Wesbrook Mall Vancouver British Columbia V6T 2A3 Canada Institut für Theoretische Physik II Ruhr-Universität Bochum D-44780 Bochum Germany Department of Physics The Ohio State University Columbus Ohio 43210 USA M. Smoluchowski Institute of Physics Jagiellonian University PL-30348 Kraków Poland Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany Department of Physics Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany JARA-High Performance Computing Forschungszentrum Jülich D-52425 Jülich Germany

We employ a variety of ab initio methods, including Faddeev-Yakubovsky equations, no-core configuration interaction approach, coupled-cluster theory, and in-medium similarity renormalization group, to perform a comprehensive analysis of the nucleon-deuteron elastic and breakup reactions and selected properties of light and medium-mass nuclei up to Ca48 using the recently constructed semilocal coordinate-space regularized chiral nucleon-nucleon potentials. We compare the results with those based on selected phenomenological and chiral EFT two-nucleon potentials, discuss the convergence pattern of the chiral expansion, and estimate the achievable theoretical accuracy at various chiral orders using an approach to quantify truncation errors of the chiral expansion without relying on cutoff variation. We also address the robustness of this method and explore alternative ways to estimate the theoretical uncertainty from the truncation of the chiral expansion.

关键词： Few-body systems Nuclear forces

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Overview of KAGRA : Data transfer and management

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Progress of Theoretical and Experimental Physics 2023年第10期2023卷

作者： Akutsu, T Ando, M Arai, K Arai, Y Araki, S Araya, A Aritomi, N Asada, H Aso, Y Bae, S Bae, Y Baiotti, L Bajpai, R Barton, M A Cannon, K Cao, Z Capocasa, E Chan, M Chen, C Chen, K Chen, Y Chiang, C-Y Chu, H Chu, Y-K Eguchi, S Enomoto, Y Flaminio, R Fujii, Y Fujikawa, Y Fukunaga, M Fukushima, M Gao, D Ge, G Ha, S Hagiwara, A Haino, S Han, W-B Hasegawa, K Hattori, K Hayakawa, H Hayama, K Himemoto, Y Hiranuma, Y Hirata, N Hirose, E Hong, Z Hsieh, B Huang, G-Z Huang, H-Y Huang, P Huang, Y-C Huang, Y Hui, D C Y Ide, S Ikenoue, B Imam, S Inayoshi, K Inoue, Y Ioka, K Ito, K Itoh, Y Izumi, K Jeon, C Jin, H-B Jung, K Jung, P Kaihotsu, K Kajita, T Kakizaki, M Kamiizumi, M Kanda, N Kang, G Kawaguchi, K Kawai, N Kawasaki, T Kim, C Kim, J Kim, J C Kim, W S Kim, Y-M Kimura, N Kita, N Kitazawa, H Kobayashi, Y Kojima, Y Kokeyama, K Komori, K Kong, A K H Kotake, K Kozakai, C Kozu, R Kumar, R Kume, J Kuo, C Kuo, H-S Kuromiya, Y Kuroyanagi, S Kusayanagi, K Kwak, K Lee, H K Lee, H W Lee, R Leonardi, M Li, K L Lin, L C-C Lin, C-Y Lin, F-K Lin, F-L Lin, H L Liu, G C Luo, L-W Majorana, E Marchio, M Michimura, Y Mio, N Miyakawa, O Miyamoto, A Miyazaki, Y Miyo, K Miyoki, S Mori, Y Morisaki, S Moriwaki, Y Nagano, K Nagano, S Nakamura, K Nakano, H Nakano, M Nakashima, R Nakayama, Y Narikawa, T Naticchioni, L Negishi, R Quynh, L Nguyen Ni, W-T Nishizawa, A Nozaki, S Obuchi, Y Ogaki, W Oh, J J Oh, K Oh, S H Ohashi, M Ohashi, T Ohishi, N Ohkawa, M Ohta, H Okutani, Y Okutomi, K Oohara, K Ooi, C Oshino, S Otabe, S Pan, K Pang, H Parisi, A Park, J Arellano, F E Peña Pinto, I Sago, N Saito, S Saito, Y Sakai, K Sakai, Y Sakuno, Y Sasaki, Y Sato, S Sato, T Sawada, T Sekiguchi, T Sekiguchi, Y Shao, L Shibagaki, S Shimizu, R Shimoda, T Shimode, K Shinkai, H Shishido, T Shoda, A Somiya, K Son, E J Sotani, H Sugimoto, R Suresh, J Suzuki, T Tagoshi, H Takahashi, H Takahashi, R Takamori, A Takano, S Takeda, H Takeda, M Tanaka, H Tanaka, K Tanaka, T Tanioka, S Martin, E N Tapia San Telada, S Tomaru, T Tomigami, Y Tomura, T Travasso, F Trozzo, L Tsang, T Ts Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Research Center for the Early Universe (RESCEU) The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Institute for Cosmic Ray Research (ICRR) KAGRA Observatory The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa City Chiba 277-8582 Japan Accelerator Laboratory High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba City Ibaraki 305-0801 Japan Earthquake Research Institute The University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo 113-0032 Japan Department of Mathematics and Physics Hirosaki University 3 Bunkyo-cho Hirosaki City Aomori 036-8561 Japan Kamioka Branch National Astronomical Observatory of Japan (NAOJ) 238 Higashi-Mozumi Kamioka-cho Hida City Gifu 506-1205 Japan The Graduate University for Advanced Studies (SOKENDAI) 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Korea Institute of Science and Technology Information (KISTI) 245 Daehak-ro Yuseong-gu Daejeon 34141 Korea National Institute for Mathematical Sciences 70 Yuseong-daero 1689 Beon-gil Yuseong-gu Daejeon 34047 Korea International College Osaka University 1-1 Machikaneyama-cho Toyonaka City Osaka 560-0043 Japan School of High Energy Accelerator Science The Graduate University for Advanced Studies (SOKENDAI) 1-1 Oho Tsukuba City Ibaraki 305-0801 Japan Department of Astronomy Beijing Normal University No. 19 Xinjiekou Street Beijing 100875 China Department of Applied Physics Fukuoka University 8-19-1 Nanakuma Jonan Fukuoka City Fukuoka 814-0180 Japan Department of Physics Tamkang University No. 151 Yingzhuan Rd. Danshui Dist. New Taipei City 25137 Taiwan Department of Physics and Institute of Astronomy Nation

KAGRA is a newly built gravitational wave observatory, a laser interferometer with a 3 km arm length, located in Kamioka, Gifu prefecture, Japan. In this article, we describe the KAGRA data management system, i.e., recording of data, transfer from the KAGRA experiment site to computing resources, as well as data distribution to tier sites, including international sites in Taiwan and Korea. The amount of KAGRA data exceeded 1.0 PiB and increased by about 1.5 TB per day during operation in 2020. Our system has succeeded in data management, and has achieved performance that can withstand observations after 2023, that is, a transfer rate of 20 MB s-1or more and file storage of sufficient capacity for petabyte class. We also discuss the sharing of data between the global gravitational-wave detector network with other experiments, namely LIGO and Virgo. The latency, which consists of calculation of calibrated strain data and transfer time within the global network, is very important from the view of multi-messenger astronomy using gravitational waves. Real-time calbrated data delivered from the KAGRA detector site and other detectors to our computing system arrive with about 4–15 seconds of latency. These latencies are sufficiently short compared to the time taken for gravitational wave event search computations. We also established a high-latency exchange of offline calibrated data that was aggregated with a better accuracy compared with real-time data.

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Few- and many-nucleon systems with semilocal coordinate-space regularized chiral nucleon-nucleon forces

arXiv

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arXiv 2018年

作者： Binder, S. Calci, A. Epelbaum, E. Furnstahl, R.J. Golak, J. Hebeler, K. Hüther, T. Kamada, H. Krebs, H. Maris, P. Meißner, Ulf G. Nogga, A. Roth, R. Skibinski, R. Topolnicki, K. Vary, J.P. Vobig, K. Wita la, H. Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Physics Division Oak Ridge National Laboratory Oak RidgeTN37831 United States TRIUMF 4004 Wesbrook Mall VancouverBCV6T 2A3 Canada Institut für Theoretische Physik II Ruhr-Universität Bochum BochumD-44780 Germany Department of Physics Ohio State University ColumbusOH43210 United States M. Smoluchowski Institute of Physics Jagiellonian University KrakówPL-30348 Poland Institut für Kernphysik Technische Universität Darmstadt Darmstadt64289 Germany Department of Physics Faculty of Engineering Kyushu Institute of Technology Kitakyushu804-8550 Japan Department of Physics and Astronomy Iowa State University AmesIA50011 United States Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany JARA - High Performance Computing Forschungszentrum Jülich JülichD-52425 Germany

We employ a variety of ab initio methods including Faddeev-Yakubovsky equations, No-Core Configuration Interaction Approach, Coupled-Cluster Theory and In-Medium Similarity Renormalization Group to perform a comprehensive analysis of the nucleon-deuteron elastic and breakup reactions and selected properties of light and medium-mass nuclei up to 48Ca using the recently constructed semilocal coordinate-space regularized chiral nucleon-nucleon potentials. We compare the results with those based on selected phenomenological and chiral EFT two-nucleon potentials, discuss the convergence pattern of the chiral expansion and estimate the achievable theoretical accuracy at various chiral orders using the novel approach to quantify truncation errors of the chiral expansion without relying on cutoff variation. We also address the robustness of this method and explore alternative ways to estimate the theoretical uncertainty from the truncation of the chiral expansion. Copyright © 2018, The Authors. All rights reserved.

关键词： Statistical mechanics

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Möbius domain-wall fermions on gradient-flowed dynamical HISQ ensembles

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Physical Review D 2017年第5期96卷 054513-054513页

作者： Evan Berkowitz Chris Bouchard Chia Cheng Chang (張家丞) M. A. Clark Bálint Joó Thorsten Kurth Christopher Monahan Amy Nicholson Kostas Orginos Enrico Rinaldi Pavlos Vranas André Walker-Loud Institut für Kernphysik and Institute for Advanced Simulation Forschungszentrum Jülich 54245 Jülich Germany Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California 94550 USA School of Physics and Astronomy University of Glasgow Glasgow G12 8QQ United Kingdom Department of Physics The College of William & Mary Williamsburg Virginia 23187 USA Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA NVIDIA Corporation 2701 San Tomas Expressway Santa Clara California 95050 USA Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport News Virginia 23606 USA NERSC Lawrence Berkeley National Laboratory Berkeley California 94720 USA New High Energy Theory Center and Department of Physics and Astronomy Rutgers The State University of New Jersey Piscataway New Jersey 08854 USA Department of Physics University of California Berkeley California 94720 USA Theory Center Thomas Jefferson National Accelerator Facility Newport News Virginia 23606 USA RIKEN-BNL Research Center Brookhaven National Laboratory Upton New York 11973 USA

We report on salient features of a mixed lattice QCD action using valence Möbius domain-wall fermions solved on the dynamical Nf=2+1+1 highly improved staggered quark sea-quark ensembles generated by the MILC Collaboration. The approximate chiral symmetry properties of the valence fermions are shown to be significantly improved by utilizing the gradient-flow scheme to first smear the highly improved staggered quark configurations. The greater numerical cost of the Möbius domain-wall inversions is mitigated by the highly efficient QUDA library optimized for NVIDIA GPU accelerated compute nodes. We have created an interface to this optimized QUDA solver in Chroma. We provide tuned parameters of the action and performance of QUDA using ensembles with the lattice spacings a≃{0.15,0.12,0.09} fm and pion masses mπ≃{310,220,130} MeV. We have additionally generated two new ensembles with a∼0.12 fm and mπ∼{400,350} MeV. With a fixed flow time of tgf=1 in lattice units, the residual chiral symmetry breaking of the valence fermions is kept below 10% of the light quark mass on all ensembles, mres≲0.1×ml, with moderate values of the fifth dimension L5 and a domain-wall height M5≤1.3. As a benchmark calculation, we perform a continuum, infinite volume, physical pion and kaon mass extrapolation of FK±/Fπ± and demonstrate our results are independent of flow time and consistent with the FLAG determination of this quantity at the level of less than one standard deviation.

关键词： Lattice QCD Lattice field theory Quantum chromodynamics

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Ab initio Calculations of the Isotopic Dependence of Nuclear Clustering

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Physical Review Letters 2017年第22期119卷 222505-222505页

作者： Serdar Elhatisari Evgeny Epelbaum Hermann Krebs Timo A. Lähde Dean Lee Ning Li Bing-nan Lu Ulf-G. Meißner Gautam Rupak Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany Department of Physics Karamanoglu Mehmetbey University Karaman 70100 Turkey Institut für Theoretische Physik II Ruhr-Universität Bochum D-44870 Bochum Germany Kavli Institute for Theoretical Physics University of California Santa Barbara California 93106-4030 USA Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA Department of Physics North Carolina State University Raleigh North Carolina 27695 USA JARA—High Performance Computing Forschungszentrum Jülich D-52425 Jülich Germany Department of Physics and Astronomy and HPC2 Center for Computational Sciences Mississippi State University Mississippi State Mississippi 39762 USA

Nuclear clustering describes the appearance of structures resembling smaller nuclei such as alpha particles (He4 nuclei) within the interior of a larger nucleus. In this Letter, we present lattice Monte Carlo calculations based on chiral effective field theory for the ground states of helium, beryllium, carbon, and oxygen isotopes. By computing model-independent measures that probe three- and four-nucleon correlations at short distances, we determine the shape of the alpha clusters and the entanglement of nucleons comprising each alpha cluster with the outside medium. We also introduce a new computational approach called the pinhole algorithm, which solves a long-standing deficiency of auxiliary-field Monte Carlo simulations in computing density correlations relative to the center of mass. We use the pinhole algorithm to determine the proton and neutron density distributions and the geometry of cluster correlations in C12, C14, and C16. The structural similarities among the carbon isotopes suggest that C14 and C16 have excitations analogous to the well-known Hoyle state resonance in C12.

关键词： Cluster models Nuclear charge distribution Nuclear forces Nuclear many-body theory Nuclear structure & decays Nucleon distribution Nucleon-nucleon interactions

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